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Flatten PDF Online — Free and Private

Flatten PDF to bake form fields, annotations and layers into the page so nothing shifts after it is sent. Add your one PDF and get a flattened PDF with form fields and annotations baked in — no upload, no signup, no watermark.

What you can do with Flatten PDF

Freezes filled-in form fields

Merges annotations into the page

Prevents accidental edits by the recipient

How to flatten pdf in 3 steps

  1. Add the PDF

    Works on filled forms and annotated drafts.

  2. Flatten the document

    Fields and markup become part of the page.

  3. Download the flattened PDF

    A fixed, uneditable copy.

Before a document leaves your organisation you usually want one of two things: a lock on it, or the traces removed from it. Flatten PDF applies that change locally, which matters because the file and the password never travel over the network. Keep an unencrypted master copy — passwords on PDFs are easy to lose.

No upload

Your one PDF are read locally with JavaScript and WebAssembly — for this tool, nothing is sent to a server.

No signup

No account, no email, no credit card, no trial to remember.

No watermark

What you download is the real file — clean, unmarked and print-ready.

Flatten PDF FAQ

What do I get back after using Flatten PDF?

You get a flattened PDF with form fields and annotations baked in.

Is this tool really free?

Yes. Every tool here is free with no account, no trial and no watermark. There is no daily limit and no paywalled export — the whole toolkit is open source.

Are my files uploaded to a server?

No. Flatten PDF runs in your browser with JavaScript and WebAssembly, so your one PDF are processed on your device and nothing is uploaded for this tool. That matters for contracts, invoices, IDs and anything under an NDA.

Does it work on a phone, and can I use it offline?

Yes. The page works in any modern browser on desktop, tablet or phone, and once it has loaded it keeps working with no connection.

Related PDF tools

Encrypt PDF Add a password to protect your PDF. Decrypt PDF Remove password protection from a PDF. Remove Metadata Strip hidden data from your PDF. Edit Metadata Change the author, title, and other properties. Merge PDF Combine multiple PDFs into one file. Split PDF Extract a range of pages into a new PDF.

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MusePDF ships 61 browser-based PDF tools. Browse the full homepage list.