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Form Fields
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Files processed locally — never uploaded
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How It Works
1
Upload PDF form
Drop a PDF with form fields.
2
Fill in fields
Type values in detected form fields.
3
Download
Get the filled PDF.
FAQ
How does PDF form filling work?
The tool detects form fields in your PDF using pdf-lib.js and lets you fill them in your browser. No data uploaded.
What types of form fields are supported?
Text fields, checkboxes, radio buttons, and dropdowns.
Is my PDF uploaded?
No. All processing in your browser.
Can I save the filled form?
Yes. Download the filled PDF with all values embedded.
Are the filled values permanent?
Yes. Values are embedded in the PDF. Use our <a href="/ai/pdf/flatten">Flatten PDF</a> tool to make them non-editable.
Does it work with all PDF forms?
Works with standard AcroForm fields. XFA forms (LiveCycle) are not supported.
Can I edit values after saving?
Yes — re-upload the filled PDF and change values. Or use the Flatten tool to lock them.
Does it work on mobile?
Yes. Fill in form fields on any device.
Is there a page limit?
No.
Can I pre-fill forms programmatically?
Not through this tool. For automation, use pdf-lib.js directly in your code.
Does it preserve digital signatures?
Existing signatures remain but may be invalidated when form values change.
Can I add new fields?
No. This tool fills existing fields. Unlike Adobe Acrobat (subscription required), our tool is free and runs locally. Use our <a href="/ai/pdf/editor">PDF Editor</a> to add new text.
How do I know which fields exist?
The tool automatically detects and displays all fillable fields.
Is it free?
Yes.
Can I pay with crypto?
PDF tools are free. See all <a href="/ai/pdf">PDF Tools</a>. AI writing tools accept crypto from $9.99/month.
Do more with your documents
Summarize, rewrite, or translate the text in your PDFs with AI.
Fill in PDF form fields using pdf-lib.js in your browser. Supports text fields, checkboxes, radio buttons, and dropdowns.