Flatten PDF

Your files never leave your device

FileKit — Free browser-based file tools. No upload, no signup.

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Max 500.0 MB per file·Supports: PDF

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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.

Your Privacy, Guaranteed

FileKit processes every file directly in your browser using JavaScript and WebAssembly. Your documents, images, and data never leave your device — there is no server upload, no cloud storage, and no account required. What happens in your browser stays in your browser.

100% client-side processing
No server upload — ever
No account or signup needed
Works offline after first load