Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / PDF Tools / Fill PDF Form

Fill PDF Form

Detect form fields and fill text boxes, checkboxes and dropdowns.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Fill PDF Form works

Fill PDF Form runs entirely in your browser. Detect form fields and fill text boxes, checkboxes and dropdowns. Under the hood it uses pdf-lib (a pure-JavaScript library that creates and edits PDF structure (pages, text, images, forms)) and PDF.js (Mozilla’s PDF renderer, used for thumbnails, previews and text extraction (runs in a Web Worker)). Your files are read into this tab’s memory, processed on your own CPU, and handed back to you as a download. Nothing is sent to a server.

Input: PDF.

How to use Fill PDF Form

Drop your PDF onto the Fill PDF Form area, or click to choose it.
Wait a moment while page thumbnails render locally.
Choose the pages and options you need. Previews update as you go.
Press the main action button and download the finished PDF.

Tips

Encrypted PDFs must be unlocked first with Unlock PDF.
Large scanned PDFs are mostly images. Compress PDF shrinks them the most.
Your original file is never modified; you always download a new copy.

Fill PDF Form FAQ

Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Related tools

Merge PDF: Combine multiple PDFs into one ordered document with drag-and-drop sorting.
Split PDF: Split by ranges, every N pages, or extract each page into a ZIP.
Compress PDF: Shrink PDF size with smart image downsampling and stream compression.
Sign PDF: Draw, type or upload a signature and place it anywhere, plus dates and initials.