#80 · PDF Compression & Optimization Tool

Flatten PDF Form Fields

Flatten standard AcroForm fields into page content locally, preserving entered values in a new PDF for sharing or archiving.

PDF Tool

Filled PDF form
pages
Ad space

How to use this PDF tool

  1. Select a PDF file.
  2. Choose the processing option that fits the document.
  3. Run the tool and review the result summary.
  4. Download the new output file.

What this tool does

Flatten standard AcroForm fields into page content locally, preserving entered values in a new PDF for sharing or archiving.

Files are analyzed and processed locally with PDF.js, pdf-lib, Canvas, or JSZip as required. No upload endpoint is used.

Browser memory sets the practical file-size limit. Keep the original document until the result has been checked.

Supported formats

Input is limited to PDF files. The downloadable result is a PDF, ZIP, CSV, or text report according to this tool’s stated purpose.

InputOutput
PDFProcessed local result
Encrypted PDFNot supported without prior unlocking

Tips for better results

  • Keep the source PDF until you have reviewed the output.
  • Process smaller batches on memory-limited mobile devices.
  • Password-protected or damaged PDFs may need to be repaired or unlocked first.

FAQ

What happens to form values after PDF fields are flattened?

Values in supported AcroForm fields are drawn into the page content and the interactive fields are removed.

Can I flatten an XFA PDF form in the browser?

No. Dynamic XFA forms are not supported by pdf-lib; use a desktop PDF application for those files.

Should I fill every field before flattening the PDF?

Yes. Flattening is intended as the final step because the resulting values are no longer editable as form controls.

Will signatures remain valid after flattening form fields?

Any document modification can invalidate cryptographic signatures. Do not use this tool when signature validation must be preserved.

What if the PDF has no standard form fields?

The tool reports that no AcroForm fields were found instead of claiming a change was made.

Processing details

PrivacyLocal browser processing
LimitAvailable device memory
ResultNew downloadable file

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