Flatten PDF
Flatten PDF — right in your browser, nothing uploaded.
Drag & drop your PDF here, or click to choose. Everything runs in your browser — nothing is uploaded.
Flattening a PDF merges interactive form fields into the page itself, so the values become part of the document and can no longer be changed, cleared or re-filled. It is what you want before sending a completed form to someone, or archiving a signed document. This tool flattens entirely in your browser — the file is never uploaded.
Frequently Asked Questions
How do I use the Flatten PDF tool?
Drop your file onto the box above (or click to choose), set any options you need, then press the button and the finished file downloads immediately. Nothing is uploaded and there is no signup or watermark.
Is my PDF uploaded anywhere?
No. The file is opened and processed directly in your browser using JavaScript, and never leaves your device — nothing is sent to a server at any point. That is what makes it safe for contracts, invoices, medical records and other confidential documents, and it is why the tool still works with your network disconnected.
What exactly does flattening do?
It takes the interactive layer — text boxes, checkboxes, dropdowns — and draws their current values permanently onto the page, then removes the fields. The document looks identical but is no longer editable, which stops recipients from accidentally (or deliberately) altering the answers.
Is there a file size or page limit?
There is no limit imposed by us, because nothing is uploaded — the only real constraint is your device’s memory. Documents of a few hundred pages are fine on a normal computer; very large scanned files are more comfortable on a desktop browser than on a phone.
Does it work on Mac, Windows, iPhone and Android?
Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android with nothing to install and no account needed. Once the page has loaded it keeps working offline, so you can use it on a plane or a locked-down network.