Flatten PDF merges fillable form fields, digital signatures, and annotation layers into the static page content, so the result can't be accidentally edited or unchecked after it's finalized.
Upload the finished PDF. Filled-in forms, commented drafts, or files with layers.
Choose what to flatten. Everything, or only form fields, only annotations, or only layers.
Download the locked copy. Values and marks become part of the page and can't be changed. Keep the original if you may need to edit again.
| You want to… | Use this tool |
|---|---|
| Form fields | The typed values stay as plain text; the fields are gone |
| Checkboxes and radio buttons | Ticks become fixed marks that can't be changed |
| Comments and highlights | Printed onto the page permanently |
| Signatures | Their appearance is kept, but a cryptographic signature may no longer validate |
| Layers | Merged into a single visible page |
Legal teams flatten signed contracts before archival to prevent post-signature form-field modifications.
HR teams flatten filled W-9, I-9, and benefits enrollment forms to prevent tampering after employee submission.
Print shops flatten complex PDFs with layers to ensure consistent rendering across older print drivers.
No — flattening is permanent; keep an unflattened copy if you might need to edit the form fields again.
Flatten merges interactive content (form fields, annotations, comments, layers, hyperlinks) into permanent page content. The PDF becomes uneditable but visually identical.
Yes. After flatten, form fields are converted to static text — no one can re-edit them. Original interactive PDF should be archived separately if re-editing might be needed.
Yes. Signatures and other annotations are baked into the page as static images. Cryptographic signature validity may be lost — use signing tools that support flatten-after-sign workflows for legal compliance.
Slightly. Removing interactive metadata saves a small amount. For real size reduction, run our Compress tool after flatten.
Yes. Choose to flatten form fields, annotations, layers, or all interactive content separately. Useful for keeping comments while locking down form inputs.
No. Flatten is permanent — interactive metadata is destroyed in the output. Keep the original interactive PDF as backup before flattening.
Yes — 30 flatten operations per day for guests, more on free accounts. No watermark on output.
Unlock first with our Unlock PDF tool. Encrypted PDFs cannot be flattened directly.
