Flatten PDF
Flatten a PDF online for free — lock filled-in form fields into the page so they can't be edited, or flatten everything (comments, stamps, signatures and layers) into the page image. Runs 100% in your browser; nothing is uploaded.
100% private — your PDF never leaves your browser. Conversion happens on your device; nothing is uploaded.
“Form fields only” bakes the typed values into the page so they can’t be changed. “Everything” turns each page into an image, locking in comments, stamps, signatures and layers too. Your PDF never leaves your device.
How to flatten a PDF
- Drop your PDF here, or click to choose it — the tool checks it for form fields.
- Choose “Form fields only” to lock the form values in, keeping text selectable.
- Or choose “Everything” to flatten comments, stamps and layers too, and pick the image quality.
- Click “Flatten & download” to save the flattened PDF.
What you can use it for
- Lock a filled-in form before emailing it so answers can't be changed
- Make form entries show up when printing or in apps that hide form fields
- Bake comments, stamps and signatures into the page
- Fix PDFs that look different in different viewers
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See all free PDF tools →Frequently asked questions
What does flattening a PDF mean?
Flattening turns interactive or layered parts of a PDF — form fields, annotations, comments and layers — into ordinary page content. The PDF looks the same, but those parts can no longer be edited or hidden.
How do I flatten a fillable PDF form?
Fill in the form and save it, then drop it here. “Form fields only” is chosen automatically when fields are found. Click “Flatten & download” and the typed values become part of the page.
Which option should I choose?
Use “Form fields only” for forms: the file stays small and the text stays selectable. Use “Everything” to lock in comments, stamps, drawings or layers as well — each page becomes an image.
Will flattening reduce quality?
“Form fields only” changes nothing else on the page. “Everything” renders pages as images; choose 300 DPI for print-quality results or 150 DPI for a smaller file.
Can I undo flattening?
No — that's the point. Keep a copy of the original if you might need to edit the form again.
Is my PDF uploaded?
No. Flattening runs entirely in your browser, so forms with personal details never leave your device.