Free · no signup · nothing uploaded
Flatten PDF
Bake a PDF's form fields into the page so they can no longer be edited — right in your browser, no upload.
Short answer
To flatten a PDF, choose your file and download the flattened version. Flattening turns interactive form fields into permanent page content, so the filled-in values stay visible but can’t be changed. It runs in your browser, so nothing is uploaded. Ideal before sending a completed form.
Flatten PDF guides
How to flatten a PDF
- 1Open the tool. Open the flatten PDF tool — no signup.
- 2Choose your PDF. Select or drop the filled form.
- 3Flatten. Fields are baked into the page in your browser.
- 4Download. Save the flattened, non-editable PDF.
What flattening changes
| PDF feature | After this tool runs | Why |
|---|---|---|
| Filled-in field values | Kept, drawn onto the page | Values become ordinary page content |
| Editable fields | Removed | That is the point — no one can alter the answers |
| Appearance | Looks identical | The field's own rendering is painted in place |
| Text | Stays selectable | Drawn as real text, not an image |
| Signatures fields | Become static | A flattened signature can no longer be validated |
| Reversibility | Permanent | Keep the original if you may need to edit it again |
Flattening is what you want before emailing a completed form: the recipient sees exactly what you filled in and cannot change it. Because it is irreversible, save your editable copy first.
Frequently asked questions
What does flattening a PDF do?+
It converts interactive form fields (text boxes, checkboxes, dropdowns) into fixed page content. The values you entered stay visible exactly as they look, but nobody can edit or clear them afterward — useful before sharing a completed form.
Are my PDFs uploaded?+
No. Flattening runs entirely in your browser with pdf-lib, so the document never leaves your device — safe for signed or personal forms, and it works offline once loaded.
Will my filled-in answers stay?+
Yes. Flattening preserves the current field values and draws them permanently onto the page; only the ability to edit them is removed.
Is flattening the same as securing or redacting a PDF?+
No. Flattening stops form fields from being edited, but it isn't encryption or redaction — it doesn't password-protect the file or remove hidden content. Use dedicated protect/redact tools for those needs.
What if my PDF has no form?+
It's simply re-saved unchanged — flattening only affects interactive form fields, so a regular PDF passes through safely.
Related tools
Your PDF is flattened entirely in your browser and is never uploaded. Flattening makes AcroForm fields non-editable; it is not a security or redaction feature. Provided free and ad-supported, without warranty.