Is it safe to flatten a PDF online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

Why flatten before sharing?

Some PDF viewers don't render interactive forms or annotations correctly. Flattening guarantees identical visuals everywhere.

No — flattening is permanent. Keep your original if you need to edit later.

Flatten PDF

Bake annotations and form-field values into the static page content. The visual result is identical, but the document becomes print-ready, tamper-proof, and works in any viewer (including ones that don't support interactive forms).

Features

Flatten annotations (highlights, stamps, comments, drawings)
Flatten form-field values (text, checkboxes, dropdowns)
Pick what to flatten — annotations, forms, or both
Output is identical-looking but non-editable
Smaller file (widget data removed)

How to flatten pdf

Drop the PDF — Drag a PDF with annotations or filled form fields.
Pick what to flatten — Annotations, form fields, or both.
Save — Download the flattened PDF.

Frequently asked questions

Is it safe to flatten a PDF online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
Why flatten before sharing?: Some PDF viewers don't render interactive forms or annotations correctly. Flattening guarantees identical visuals everywhere.
Can I undo?: No — flattening is permanent. Keep your original if you need to edit later.