Verify Signature
Check whether a PDF carries a cryptographic signature, whether it covers the whole document, and whether the file has been changed since.
- Secure processing, files wiped after 60 min
- No sign-up required
- Up to 512 MB
Check whether a PDF carries a cryptographic signature, whether it covers the whole document, and whether the file has been changed since. The tool accepts PDF, ZIP files and works straight from your browser: nothing to install, no account to create.
The operation is applied directly to the file structure, with no round trip through a conversion: the original content is never re-encoded.
Your files are processed on our European servers and then wiped automatically: they are never read, never kept, and never reused to train anything.
When is this tool useful?
- Put together a complete application file
- Slim down a document before sending it by email
- Protect a confidential document before sharing it
- Fix a document you received without going back to its author
How to do it
- Drop your file in the area above, or click to pick it.
- Click “Verify Signature” and wait while it processes.
- Download the result. The link stays valid for 60 minutes.
Frequently asked questions
Do you keep my files?
No. They are deleted automatically from our servers shortly after processing, along with the output file and the download link.
Do I need an account?
No, the tool works right away. An account is only needed to lift the daily limits.
Does the result carry a watermark?
Never. We add no mark of any kind to the files we produce, including on the free plan.