Stopwatch

A precise stopwatch with laps. It runs entirely in this tab — nothing to install, nothing tracked.

This tool runs entirely in your browser — nothing you type or open here is ever uploaded. You can disconnect from the internet after the page loads and it still works.

00:00.00

Need more than this page can do?

The PDF Toolbox desktop app compresses, redacts with verified removal, OCRs scans, repairs damaged files, converts to PDF/A and handles 500-page documents — all offline, on your machine, with the same promise: nothing ever leaves it. See everything it does →

More utilities & calculators

⏲️ Countdown timer

Beeps when done; the tab title shows the time left.

🔑 Password generator

Cryptographically random — created on your device, sent nowhere.

⬜ QR code generator

Any link or text to a PNG QR code — private links stay private.

🔍 QR code reader

Decode a QR from a photo — the content stays on your device.

#️⃣ Hash generator

MD5, SHA-1, SHA-256, SHA-512 of text or files; verify checksums.

🎫 JWT decoder

Decode tokens without pasting credentials into someone's server.

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