Crypto

PDF signature & annotator

Stamp a visual signature, text, date or check mark onto a PDF. Runs entirely in your browser — the file is never uploaded. This is a visual stamp, not a cryptographic digital signature.

Visual stamp only

This adds a picture of a signature or annotation to the PDF. It is NOT a cryptographic digital signature and does not prove authenticity.

Drop a PDF here, or click to choose

PDF files only

Everything happens in your browser. Your PDF is never uploaded.

Related tools

Certificate decoder

Decode an X.509 certificate or CSR: subject, validity, SANs, key, and fingerprints.

PDF signature checker

Check whether a PDF contains a digital signature.

HAR viewer

Inspect a HAR (HTTP Archive) export from your browser's network tab — requests, status, size, timing and a waterfall.

EXIF viewer & remover

View an image's EXIF metadata (including GPS) and download a metadata-free copy. Runs entirely in your browser.