Flatten PDF
Flatten PDF forms online, free: lock fillable fields into the page content so they cannot be changed.
Flattens fillable form fields into fixed page content so the entered data can no longer be changed — ideal for final versions and archiving.
Only AcroForm fields are affected; if you also need to handle annotations and highlights, combine it with Remove Annotations.
Everything runs locally in your browser — nothing is uploaded to any server.
How to use
- Upload a PDF — Drop in a document containing form fields.
- Check the field count — Confirm which fields will be flattened.
- Flatten and download — Export the locked, final version.
Related tools
- Sign PDF — Draw / type / image signature, click to place
- Add Stamps — Place preset or image stamps on any page, with position and opacity
- Edit PDF — Add text, highlights and box marks
- Add Watermark — Stamp text or image watermarks with tiling, rotation and CJK support
- Add Page Numbers — Add page numbers with position, format and start number options
- Bookmarks — Read existing bookmarks or build a new outline, Chinese supported
- Crop PDF — Drag a crop box or use presets — applies to all or selected pages
- Find & Redact — Search text and black it out, with per-match review
- Remove Annotations — Delete highlights, comments, links and all other annotations