OSHIStamp: YouTube Video Timestamp Creation & AI Summary Tool

Tracking since Apr 17, 2026.

Changelog

• Jun 5, 2026
  description

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.42.0: 
  ･Added file selection by clicking the favorite image area and a link button to the image size optimization tool
  
  - v2.41.0:
  ･Added timestamp highlighting feature
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.43.0: 
  ･Added a popup that displays a list of recent notes when the extension icon is clicked
  
  - v2.42.0: 
  ･Added file selection by clicking the favorite image area and a link button to the image size optimization tool
  
  - v2.41.0:
  ･Added timestamp highlighting feature
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

• May 19, 2026
  description

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.41.0:
  ･Added timestamp highlighting feature
  
  - v2.40.0:
  ･Added Support for the new YouTube subtitle UI
  
  - v2.39.0:
  ･Enhanced AI summary features (added topic hierarchy display and an emoji-rich output option)
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.42.0: 
  ･Added file selection by clicking the favorite image area and a link button to the image size optimization tool
  
  - v2.41.0:
  ･Added timestamp highlighting feature
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

• Apr 23, 2026
  description

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.40.0:
  ･Added Support for the new YouTube subtitle UI
  
  - v2.39.0:
  ･Enhanced AI summary features (added topic hierarchy display and an emoji-rich output option)
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.41.0:
  ･Added timestamp highlighting feature
  
  - v2.40.0:
  ･Added Support for the new YouTube subtitle UI
  
  - v2.39.0:
  ･Enhanced AI summary features (added topic hierarchy display and an emoji-rich output option)
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

• Apr 17, 2026
  description

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.38.0:
  ･Added Support for the new YouTube subtitle UI
  
  - v2.37.0:
  ･Added support for the new Google AI Studio UI
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

  YouTube Video: Timestamp Creation Assistant Tool
  
  This is a free tool that assists with creating timestamps for YouTube videos.
  
  With intuitive controls, you can easily create and edit timestamps, and for advanced users, quick tasks using keyboard shortcuts are also available.
  
  Additionally, with the AI summary and the per-video saved memo list, you can jump to the corresponding video with a single click, allowing smooth access to previously created timestamps.
  
  It helps make your fan activities more enjoyable and convenient. Please make use of it!
  
  
  🔧Main Features:
  
  ✅️Insert Timestamps
  　Click the ⏱️ button while watching a video to insert the current time at the cursor position.
  
  ✅️Change Timestamp Format
  　You can choose from the following two formats for the timestamps:
  　- Short format (e.g., 2:30, 1:45:15)
  　- Full format (e.g., 00:02:30, 01:45:15)
  　※ When adjusting by ±1 second using shortcuts(CTRL + SHIFT/ALT + ↑↓), the selected format will be applied.
  
  ✅️Jump from Timestamps
  　Clicking on a timestamp link will move the video to that time.
  
  ✅️Fast Forward / Rewind
  　You can choose from preset durations (1s, 5s, 10s, 1min, 5min, 10min) using buttons. Shortcut keys (Ctrl + Shift / Alt + ←→) are also supported. One custom duration can be added as well.
  
  ✅️Playback Speed
  　Playback speed can be selected from 0.5x, 1x, 1.5x, 2x, or 2.5x using buttons.
  
  ✅️AI Summarization
  　Leverage Google AI Studio (e.g. Gemini API) to semi‑automatically summarize the content of captioned videos.
  
  　Limitations
  　- Video length: under 12 hours
  　- Caption file required 
  　- Breaks required for continuous use (due to Google AI Studio API rate limits)
  
  ✅️Video Screenshot
  　You can download a screenshot of the video in "PNG format."
  
  ✅️Generate Timestamp Links
  　Copy a link that starts playback from the current time to your clipboard with one click.
  
  ✅️Copy Timestamp
  　Copy the created timestamp to the clipboard with one click.
  
  ✅️Video playback time and current time display with toggle
  　You can view the video playback time in real time on the screen. Clicking the playback time switches the display to the current time. The displayed time may have slight discrepancies.
  
  ✅️Video-based Auto-Save Function
  　Timestamps are automatically saved to local storage as they are created, so there's no worry about losing data during your work.
  
  　Timestamps are saved independently for each video, allowing you to manage timestamps for multiple videos collectively. Additionally, you can jump to the corresponding video with a single click from the per-video saved memo list, allowing smooth access to previously created timestamps.
  
  ✅️Backup and Restore
  　To ensure your data is carried over in the following scenarios, we provide a backup feature for timestamp data:
  　- Reinstalling the extension
  　- Reinstalling Chrome
  　- Deleting the user profile (user data directory)
  　- Reinstalling the OS or migrating to a different OS
  
  　All timestamp data can be exported and imported in JSON format, enabling easy saving and restoration. Automatic backups to Google Drive are also supported.
  
  ✅️Color Mode Feature
  　Now supports Dark Mode.
  
  ✅️Display Fan Images
  　Upload your favorite image to display on the screen, boosting motivation for your fan activities!
  　(Supported size: 500px × 70px, formats: JPG, PNG, SVG)
  
  ✅️Minimize Feature
  　Minimize the screen to the bottom right when not in use.
  
  
  👉️Keyboard Shortcuts（CTRL + SHIFT or ALT）:
  
  ･CTRL + SHIFT/ALT + S: Insert timestamp
  ･CTRL + SHIFT/ALT + K: Toggle play/pause
  ･CTRL + SHIFT/ALT + →: Skip forward by selected amount
  ･CTRL + SHIFT/ALT + ←: Skip backward by selected amount
  ･CTRL + SHIFT/ALT + ↑: Increase selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  ･CTRL + SHIFT/ALT + ↓:  Decrease selected timestamp by 1s, 10s, 1m, or 10m (multiple values can be selected)
  
  
  📝Recent Change Log:
  
  - v2.40.0:
  ･Added Support for the new YouTube subtitle UI
  
  - v2.39.0:
  ･Enhanced AI summary features (added topic hierarchy display and an emoji-rich output option)
  
  
  🔏Privacy and Data Management:
  
  This tool does not collect any user data. All data is saved locally and managed securely.
  
  
  📌Disclaimer:
  
  The developer is not responsible for any loss or damage caused by the use of this tool. Please use it at your own risk.

Permissions & access

Permissions

storagetabsunlimitedStorageidentity

Host access

None declared

Screenshots

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