DevTools Decoder

Encode, decode, and format data instantly. Base64, JWT, URL, Unix timestamps, hashes, and JSON in one popup.

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.