Verify a signed document

Drop a PDF here to check that it was signed through Lock & Quill and hasn't been changed since. Your browser calculates the file's fingerprint and sends only that fingerprint; the file itself never leaves your device.

How this works

When the last person signs, we calculate a SHA-256 fingerprint of the finished PDF and keep it. A fingerprint is a short code that changes completely if even one character of the file changes. Matching fingerprints mean the file in your hands is identical to the one that was sealed.