Flatten PDF
Flatten PDF form fields into page content. Remove editable fields and make them permanent. Free, private, and browser-based. Your files never leave your device.
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Supports PDF - up to 100 MB
Tips for flattening PDFs
Make forms permanent
Flattening converts editable form fields into static content, preventing further edits while preserving the visual layout.
Ensure consistent rendering
Flattened PDFs look identical across all viewers because form fields are baked into the page content layer.
Reduce file size
Removing form field metadata can slightly reduce the file size, especially for PDFs with many interactive fields.
Privacy first
All processing happens in your browser. Your PDF is never uploaded to any server.
How to flatten a PDF
Flattening a PDF merges all interactive form fields — such as text inputs, checkboxes, radio buttons, and digital signature appearances — into the static page content layer. After flattening, these elements become permanent parts of the page and can no longer be edited as form fields.
This is useful when you need to ensure a PDF looks identical across all viewers and devices, or when you want to prevent further edits to a filled-out form. Flattened PDFs are also ideal for archiving, printing, or sharing documents where interactive elements are no longer needed.
All processing happens locally in your browser using pdf-lib, a powerful JavaScript PDF library. Your PDF files are never uploaded to any server, ensuring complete privacy. The tool supports PDFs up to 100 MB and works with any PDF document.
Frequently asked questions
What does flattening a PDF do?
Flattening merges all form fields (text inputs, checkboxes, signatures, etc.) into the page content layer. After flattening, fields are no longer editable — they become part of the static page.
Will flattening change how my PDF looks?
No. Flattening preserves the visual appearance exactly. The only change is that form fields become non-interactive static content.
Can I flatten a PDF without form fields?
Yes. If your PDF has no form fields, the tool will simply save a clean copy of the document. No changes will be made to the content.
Does flattening remove digital signatures?
Flattening merges signature appearances into the page content. The cryptographic signature data is removed, so the signature will no longer be verifiable after flattening.
Is my PDF uploaded to a server?
No. All processing happens locally in your browser using pdf-lib. Your files never leave your device.