Drop a PDF form here
Form Fields
No form fields found in this PDF.
Files processed locally — never uploaded
How it works
Run this tool in three short steps.
01
Upload PDF form
Drop a PDF with form fields.
02
Fill in fields
Type values in detected form fields.
03
Download
Get the filled PDF.
Questions
What people ask before they use this tool.
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 as a direct file workflow.
What types of form fields are supported?
Text fields, checkboxes, radio buttons, and dropdowns.
Is my PDF uploaded?
No. All processing happens in your browser during form filling.
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="/flatten-pdf">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?
It works well for common browser-based PDF jobs. Very large files depend on your device memory and browser performance.
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. Use our <a href="/edit-pdf">PDF Editor</a> if you need to place new text on the page.
How do I know which fields exist?
The tool automatically detects and displays all fillable fields.
Can I start filling a form right away?
Yes. Upload the PDF, fill the detected fields on the page, and download the updated file from the same browser workflow.
Can I pay with crypto?
PDF tools are free. See all <a href="/pdf-tools">PDF Tools</a>. AI writing tools accept crypto from $9.99/month.
Related
Continue the workflow
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, which makes it a direct first-pass workflow for common forms before flattening, signing, or sharing.