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Flatten PDF Forms
FreeBake AcroForm field values into static page content. Recipients see filled values but can't edit them. Lossless for the page content.
What you'll get: a PDF with form field values baked into the page content — recipients see filled values but can't edit them. Lossless for the page content. For another use, try PDF Form Inspector.
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Stays in your browser
Free tools run fully on-device — nothing is uploaded to a server.
No watermarks
Clean output, no branding, no daily limits.
Free forever
No signup required. Seriously.
Why people flatten PDF forms
Filled-out forms exist in two states. In their native state, the values live in form fields that anyone can edit. After flattening, the values become part of the page content — visible to everyone, editable by no one. Flattening freezes a form so it can be safely circulated.
Send a completed form
You’ve filled out a tax form, application, or contract template. Flatten before emailing so the recipient can’t accidentally (or maliciously) modify your answers.
Compliance archiving
Audit-grade copies of completed forms must be non-editable. Flatten before depositing into the records system.
Print previewing
Some printers render form fields differently from final content. Flatten first so what you see in preview is exactly what comes out of the printer.
Fixing rendering quirks
Some PDF viewers don’t render form values until you click into the field. Flatten to bake values into the page so every viewer shows them.
Bulk form processing
When you’ve filled many forms via automation, flatten them all before downstream tools (OCR, archival, distribution) handle them.
Standardize for review
Reviewers shouldn’t accidentally tab into a form field while reading. Flatten makes the document strictly read-only.
How Flatten PDF Forms works
Three steps, no signup, no uploads.
- STEP 1Drop your PDFUp to 100 MB. We load the form structure with pdf-lib.
- STEP 2Click Flatten formspdf-lib’s PDFForm.flatten() walks every AcroForm field, reads its current value, and draws it into the page’s content stream. Then it removes the interactive widgets.
- STEP 3DownloadOutput looks identical to viewers but the forms are no longer fields — just static text. Recipients see filled values, can’t edit them.
What makes pdfcraft ai different
- Same engine Chrome usesPDFium is Google's PDF engine — the one that powers Chrome's built-in PDF viewer. We compile it to WebAssembly so it runs in your browser at near-native speed.
- 100% local processingMost free PDF tools upload your file to a server, process it, and stream the result back. We don't. Your file lives in your browser tab and never touches our infrastructure. Verifiable in your browser's Network panel.
- No watermark, no signup, no daily limitConvert 1 PDF or 1,000. We don't gate on volume because there's nothing to gate on — the engine runs on your machine.
- Honest about limitationsWhen something the tool can't do (encrypted PDFs, cross-reference streams), we tell you clearly instead of failing silently. Same for partial results: sampled vs exact, embedded vs not.
- Open standards, free enginesPDFium is BSD/Apache licensed (free for any use). We don't pay vendor license fees and pass that savings on to you (and to ourselves) as a free, ad-supported tool with no upgrade-to-pro pressure.
Frequently asked questions
Will signature fields be preserved?
Visually yes — the visible signature appearance becomes part of the page content. Cryptographically no — flattening invalidates the signature’s integrity binding (which is the whole point of cryptographic signing). Don’t flatten anything that needs to remain a verifiable signed document.
Are XFA forms supported?
No. XFA is a separate (deprecated) form format that pdf-lib doesn’t handle. The op surfaces a friendly error if it encounters one. Use Adobe Acrobat for XFA flattening.
What if my PDF has no forms?
The op completes successfully with a ‘No forms to flatten’ message and returns a clean re-saved copy. No harm done.
Can I un-flatten afterwards?
No. Flattening is one-way — the field metadata is gone. Always keep an unflattened copy as your master.
Is anything uploaded?
No. pdf-lib flattens locally.
Need to inspect form fields first?
PDF Form Inspector lists every field — name, type, value, flags. Run before flattening to confirm what will be baked in.
Try PDF Form InspectorRelated PDF tools
Other tools in the Edit category — built on the same private, in-browser pipeline.
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Use cases for this tool
Step-by-step workflows that put this tool to work.