Flatten PDF Form

Flatten a PDF Form — Lock Field Values Permanently

Fillable PDFs can have their values changed after signing. CipherForces PDF Flatten uses pdf-lib’s form-flatten operation to bake every AcroForm field value into the page content so no one can edit it anymore. This is the standard step before sending a signed PDF to counterparties.

What this tool does not do: it does not remove or rewrite markup annotations (highlights, sticky notes, text comments, stamps, or freehand drawings). Those remain in the file as-is. To strip markup, use Print → Save as PDF or a PDF editor that exposes individual annotations.

Common Use Cases

• Executed contracts: Flatten after all parties have signed so no one can alter form values.
• Tax returns: Flatten a completed 1040 before emailing your CPA.
• Archival: Flattened form values render consistently across viewers forever.

Key Features

• Form-field flattening: Every AcroForm value becomes part of the page content.
• Signature preservation: Signature images stay visible and visually identical after flattening.
• Batch processing: Drop multiple PDFs and flatten them all in one run; download individually or as a ZIP.
• Error reporting: Password-protected or corrupt PDFs are skipped with a clear error, not silently dropped.

Privacy: All processing happens in your browser via pdf-lib. No upload.