Sign PDF

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Max 500.0 MB per file·Supports: PDF

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Protect PDF

Add a password to your PDF file to keep it secure

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Add Watermark

Stamp DRAFT, CONFIDENTIAL, or any text across every page

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Flatten PDF

Make a PDF non-editable by flattening all form fields and annotations into static content.

How PDF signing works

FileKit renders your drawn or uploaded signature as a PNG image and embeds it on the selected page using pdf-lib — entirely client-side. No server ever receives your signature or your document.