Drop PDF files to flatten
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Flatten PDF
Make your PDFs uneditable by flattening form fields and annotations into static content. Tamper-proof your documents — all in your browser, with zero uploads.
12 features for complete document flattening
Every interactive element — form fields, annotations, layers — converted to static, tamper-proof content.
Make Forms Uneditable
Convert all interactive form fields — text boxes, checkboxes, radio buttons, dropdowns — into static content that cannot be modified.
Flatten Annotations
Comments, highlights, sticky notes, and drawing annotations are baked into the page content permanently.
Prevent Tampering
Once flattened, the document content cannot be altered in any PDF editor. Ideal for final versions and legal documents.
Preserve Form Data
All filled-in form values are preserved as static text. What was typed in form fields becomes permanent page content.
Flatten Images & Objects
Layered images, watermarks, and embedded objects are merged into a single flat layer on each page.
Reduce File Size
Flattening often reduces file size by removing form field dictionaries, annotation structures, and redundant layers.
Batch Processing
Flatten multiple PDFs in one session. Perfect for processing signed contracts or completed forms in bulk.
Selective Flattening
Choose to flatten only form fields, only annotations, or both. Keep what you need, flatten what you do not.
Quality Preservation
Text remains crisp and searchable. Images keep their resolution. Vector graphics stay sharp. No quality loss.
Metadata Control
Optionally strip or preserve document metadata, including title, author, subject, and keywords during flattening.
Instant Processing
Flattening happens in seconds, entirely in your browser. No waiting for server processing or email delivery.
100% Client-Side
Your PDFs never leave your browser. All flattening happens locally — zero uploads, total privacy, complete security.
Flatten your PDF in 3 steps
Upload, choose options, download — tamper-proof in seconds.
Upload your PDF
Drag & drop your PDF with form fields or annotations. Multiple files can be queued for batch flattening.
Choose what to flatten
Select form fields, annotations, or both. Optionally strip metadata or compress the output file.
Download flattened PDF
Click flatten and your PDF is processed instantly. Download the uneditable, tamper-proof result.
When to flatten your PDF
Flattening is essential for document finalization, compliance, and security.
Finalize Signed Contracts
After collecting signatures on fillable PDF forms, flatten them to prevent any further edits or field modifications.
Legal Document Protection
Flatten legal documents before filing or sharing to ensure they cannot be altered after finalization.
Completed Form Archive
Flatten filled-in application forms, tax forms, and intake forms for permanent archival as static documents.
Publish Final Versions
Before distributing PDFs publicly, flatten all interactive elements to ensure a consistent viewing experience.
Regulatory Compliance
Many regulatory bodies require flattened PDFs for submitted documents to prevent post-submission modification.
Universal Compatibility
Flattened PDFs render identically in every PDF viewer. No missing form fields or broken annotations on any device.
Flatten PDFs the right way
Best practices for safe and effective document flattening.
Flatten after signing, not before
Always flatten your PDF after all signatures and form fields are filled in. Flattening before signing would make the form fields unfillable.
Keep a copy of the original
Always retain the unflattened original PDF. Once flattened, form fields cannot be made interactive again — the process is irreversible.
Use selective flattening for flexibility
If you need to keep some annotations editable but flatten form fields, use selective flattening to choose exactly what gets baked into the page.
Strip metadata for sensitive documents
Enable metadata stripping when flattening sensitive documents. This removes author names, editing history, and other hidden information.
Batch flatten for efficiency
Processing a stack of signed contracts or completed forms? Queue them all at once for batch flattening with consistent settings.
Test the flattened result
After flattening, open the result in a PDF viewer and verify that all form data and annotations appear correctly as static content.
PDFly vs. other PDF flattening tools
See why PDFly is the better choice for flattening your documents.
Your sensitive documents never leave your browser
Flatten PDF runs 100% client-side. Your contracts, legal forms, and signed documents are processed entirely on your device — no servers, no uploads, no tracking. Your confidential information stays completely private.