DevTools Decoder

About

Decode and encode Base64, JWT tokens, URLs, Unix timestamps, and more — all in one popup.

DevTools Decoder is a developer's Swiss army knife for encoding, decoding, and formatting common data formats. No more switching between jwt.io, base64decode.org, and other sites.

How it works:

1. Click the extension icon to open the multi-tool popup.
2. Pick a tab: Base64, JWT, URL, Timestamp, Hash, or JSON.
3. Paste your input — results appear instantly.
4. Copy the output with one click.

Tools included:

- Base64 — Encode and decode text to and from Base64, with full UTF-8 support.
- JWT Decoder — Paste a JWT token to see the decoded header and payload with formatted JSON and expiry status.
- URL Encode/Decode — Encode or decode URL components instantly.
- Unix Timestamp — Convert between Unix timestamps and human-readable dates in both directions. Auto-detects seconds vs milliseconds.
- Hash Generator — Generate SHA-256, SHA-1, SHA-384, and SHA-512 hashes using the Web Crypto API.
- JSON Formatter — Paste minified JSON to get pretty-printed output with syntax highlighting. One-click minify.

Features:

- Auto-detect — Paste any content and it tries to detect the format automatically.
- Remembers your last tab — Opens to whatever tool you used last.
- Keyboard friendly — Tab between tools, paste and go.
- 100% local — No data leaves your browser. No accounts, no tracking, no servers.

Privacy:

DevTools Decoder does not collect, transmit, or share any data. Your last-used tab preference is stored locally using Chrome's built-in storage. No analytics, no telemetry, no third-party services.