Flatten 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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Sign PDF

Draw or upload a signature and embed it on any page of your PDF — all in your browser.

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Compress PDF

Reduce PDF file size — four levels including page rasterisation

How PDF flattening works

FileKit uses pdf-lib to merge all form fields and widget annotations into the static page content stream. After flattening, the PDF looks identical but no fields can be edited or submitted. Processing runs entirely in your browser.