Youtube Watchmarker V3 Remake

Automatically mark YouTube videos you've already watched - now with Manifest V3 support.

As of June 2026, Youtube Watchmarker V3 Remake has 571 users and a 4.79/5 rating from 14 reviews in the Productivity category.

Usersup 15.6 percent+15.6%
571
571
Ratingdown 2.6 percent2.6%
4.79
14 reviews
Reviewsup 16.7 percent+16.7%
14
Version
1.0.11
Manifest V3
90-day change · In the last 90 days this extension 2 version updates.

History

11 snapshots

Tracking since Apr 1, 2026.

2.1K1.2K373.52Apr 1, 2026Jun 8, 2026
View as table
DateUsersRatingReviewsVersion
Apr 1, 20264944.92121.0.6
Apr 16, 20265014.92121.0.6
Apr 22, 20261.0K4.85131.0.10
Apr 27, 20265074.85131.0.10
May 4, 20265204.85131.0.10
May 10, 20265274.79141.0.10
May 15, 20265524.79141.0.10
May 21, 20265794.79141.0.11
May 26, 20262.0K4.80151.0.11
Jun 2, 20267094.79141.0.11
Jun 8, 20265844.79141.0.11
Now5714.79141.0.11

Changelog

  • May 15, 2026
    description
    Many users encounter the inconvenience of beginning a YouTube video, only to realize partway through that they have already viewed it. 
    YouTube Watchmarker addresses this issue by automatically tracking and marking previously watched videos.
    
    KEY FEATURES:
    
    🎯 Smart Detection 
    • Browser navigation tracking
    • Browser history synchronization
    • YouTube watch history synchronization
    
    👁️ Visual Indicators + Options
    • Fade out thumbnails of watched videos
    • Convert thumbnails to grayscale
    • Display "watched" badges with dates
    • Hide progress bars on completed videos
    • Ability to remove videos from watched history
    
    💾 Reliable Data Management:
    • Local database storage for privacy
    • Export/import functionality for backups
    • Hourly browser and youtube history synchronization
    
    🔍 Powerful Search - Quickly find videos in your watch history with the built-in search tool
    
    The extension runs quietly in the background, automatically updating your watch status as you browse YouTube. 
    All data is stored locally on your device.
    
    Changelog:
    v1.0.6:
    • improved youtube synchronization
    • fixed video deletion from youtube history
    
    v1.0.7:
    • fixed some issues with video marks
    
    v1.0.8:
    • added a "Quick Sync" option that will only sync the last 1000 videos watched
    
    v1.0.9:
    • added support for youtube's latest update (main page and recommendations)
    
    v1.0.10:
    • improved support for the latest youtube layout
    
    A refreshed version of the original Watchmarker for YouTube extension, now working with Manifest V3. Credit goes to the original author.
    Starting a video only to realize you’ve already seen it is annoying. YouTube Watchmarker runs in the background to prevent this by tracking what you've seen and visibly marking those videos on the site.
    
    Features:
    
    🎯 Tracking
    • Track browser navigation in real-time
    • Sync your browser history
    • Sync your YouTube watch history
    
    ⚙️ Configurable Visual Settings
    • Fade out thumbnails for videos you have already watched
    • Convert watched thumbnails to grayscale
    • Add a badge to the thumbnail showing the exact date you viewed it
    • Hide the built-in red progress bar on videos you have completed
    • Display full progress bars on videos you have completed
    
    💾 Data & Privacy:
    • All data is stored locally on the device so your history remains private
    • Synchronize your history automatically every hour
    • Support for exporting/importing your watched videos database
    • Includes a built-in search tool to quickly find previously watched videos
    • Manually remove specific videos from your YouTube/Browser history
    
    Changelog:
    v1.0.6:
    • improved youtube synchronization
    • fixed video deletion from youtube history
    
    v1.0.7:
    • fixed some issues with video marks
    
    v1.0.8:
    • added a "Quick Sync" option that will only sync the last 1000 videos watched
    
    v1.0.9:
    • added support for youtube's latest update (main page and recommendations)
    
    v1.0.10:
    • improved support for the latest youtube layout
    
    v1.0.11:
    • added a popup to make it easier and faster to sync your watched history (just click the extension icon)
    • added a new visual option to mark watched videos (red progress bar)
    
    A refreshed version of the original Watchmarker for YouTube extension, now working with Manifest V3. Credit goes to the original author.
  • Apr 16, 2026
    description
    Many users encounter the inconvenience of beginning a YouTube video, only to realize partway through that they have already viewed it. 
    YouTube Watchmarker addresses this issue by automatically tracking and marking previously watched videos.
    
    KEY FEATURES:
    
    🎯 Smart Detection 
    • Browser navigation tracking
    • Browser history synchronization
    • YouTube watch history synchronization
    
    👁️ Visual Indicators + Options
    • Fade out thumbnails of watched videos
    • Convert thumbnails to grayscale
    • Display "watched" badges with dates
    • Hide progress bars on completed videos
    • Ability to remove videos from watched history
    
    💾 Reliable Data Management:
    • Local database storage for privacy
    • Export/import functionality for backups
    • Hourly browser and youtube history synchronization
    
    🔍 Powerful Search - Quickly find videos in your watch history with the built-in search tool
    
    The extension runs quietly in the background, automatically updating your watch status as you browse YouTube. 
    All data is stored locally on your device.
    
    v1.0.6 update:
    • improved youtube synchronization
    • fixed video deletion from youtube history
    
    A refreshed version of the original Watchmarker for YouTube extension, now working with Manifest V3. Credit goes to the original author.
    Many users encounter the inconvenience of beginning a YouTube video, only to realize partway through that they have already viewed it. 
    YouTube Watchmarker addresses this issue by automatically tracking and marking previously watched videos.
    
    KEY FEATURES:
    
    🎯 Smart Detection 
    • Browser navigation tracking
    • Browser history synchronization
    • YouTube watch history synchronization
    
    👁️ Visual Indicators + Options
    • Fade out thumbnails of watched videos
    • Convert thumbnails to grayscale
    • Display "watched" badges with dates
    • Hide progress bars on completed videos
    • Ability to remove videos from watched history
    
    💾 Reliable Data Management:
    • Local database storage for privacy
    • Export/import functionality for backups
    • Hourly browser and youtube history synchronization
    
    🔍 Powerful Search - Quickly find videos in your watch history with the built-in search tool
    
    The extension runs quietly in the background, automatically updating your watch status as you browse YouTube. 
    All data is stored locally on your device.
    
    Changelog:
    v1.0.6:
    • improved youtube synchronization
    • fixed video deletion from youtube history
    
    v1.0.7:
    • fixed some issues with video marks
    
    v1.0.8:
    • added a "Quick Sync" option that will only sync the last 1000 videos watched
    
    v1.0.9:
    • added support for youtube's latest update (main page and recommendations)
    
    v1.0.10:
    • improved support for the latest youtube layout
    
    A refreshed version of the original Watchmarker for YouTube extension, now working with Manifest V3. Credit goes to the original author.

Permissions & access

Permissions
storagetabshistorycookiesalarmsscriptingdownloadsdeclarativeNetRequestWithHostAccess
Host access
https://www.youtube.com/*, https://m.youtube.com/*

Screenshots

Youtube Watchmarker V3 Remake screenshot 1Youtube Watchmarker V3 Remake screenshot 2

About

Starting a video only to realize you’ve already seen it is annoying. YouTube Watchmarker runs in the background to prevent this by tracking what you've seen and visibly marking those videos on the site.

Features:

🎯 Tracking
• Track browser navigation in real-time
• Sync your browser history
• Sync your YouTube watch history

⚙️ Configurable Visual Settings
• Fade out thumbnails for videos you have already watched
• Convert watched thumbnails to grayscale
• Add a badge to the thumbnail showing the exact date you viewed it
• Hide the built-in red progress bar on videos you have completed
• Display full progress bars on videos you have completed

💾 Data & Privacy:
• All data is stored locally on the device so your history remains private
• Synchronize your history automatically every hour
• Support for exporting/importing your watched videos database
• Includes a built-in search tool to quickly find previously watched videos
• Manually remove specific videos from your YouTube/Browser history

Changelog:
v1.0.6:
• improved youtube synchronization
• fixed video deletion from youtube history

v1.0.7:
• fixed some issues with video marks

v1.0.8:
• added a "Quick Sync" option that will only sync the last 1000 videos watched

v1.0.9:
• added support for youtube's latest update (main page and recommendations)

v1.0.10:
• improved support for the latest youtube layout

v1.0.11:
• added a popup to make it easier and faster to sync your watched history (just click the extension icon)
• added a new visual option to mark watched videos (red progress bar)

A refreshed version of the original Watchmarker for YouTube extension, now working with Manifest V3. Credit goes to the original author.

Technical

Version
1.0.11
Manifest
V3
Size
519KiB
Min Chrome
88
Languages
1
Featured
No

Metadata

ID
phoakahhndaanafnmallehjodhldlkgp
Developer ID
u41bba8d257e1cf895c972f8f0d158261
Developer Email
[email protected]
Created
Aug 19, 2025
Last Updated (Store)
May 14, 2026
Last Scraped
Jun 8, 2026
Website
hanzistack.com
Support URL
Privacy Policy

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