Fingerprint PDF Free
Add invisible tracking fingerprints to PDFs to identify the source of document leaks. No upload, no watermark.
Drop a PDF file to fingerprint
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Frequently asked questions
Everything runs entirely in your browser using WebAssembly. Your files never leave your device — no upload, no server, no cloud.
No artificial limit. Processing capacity depends only on your device's available memory. Desktop browsers typically handle files up to 500 MB.
Never. ILikePdf does not add watermarks to any output file, free or otherwise.
Yes. The tool works in any modern mobile browser (Chrome, Safari, Firefox) on Android and iPhone with no app installation.
The fingerprint is a hash-based signature of the PDF’s content streams, metadata, and structure. It changes if any part is modified.