What's the difference between Fill PDF Form and Edit PDF?

Fill is for PDFs the author designed with form fields (AcroForms) — tax forms, HR paperwork. Edit adds text overlays anywhere on any PDF, whether or not it has fields. If your PDF shows 'No fillable fields found' here, use Edit PDF instead.

Does PDFWix work with IRS forms and government applications?

Yes for AcroForms — the standard used by current IRS 1040, W-9, W-2, and most modern federal and HR forms. Some older USCIS and state DMV forms are XFA (Adobe LiveCycle); PDFWix detects XFA and tells you to use Adobe Reader for those.

Can I save my filled form without flattening, so I can edit later?

Yes — toggle 'Flatten before download' off. The downloaded PDF keeps its form fields editable in Adobe Reader, Preview, or PDFWix. Flatten is recommended only for final submission copies.

Is my data private when I fill a form here?

Yes. The whole pipeline runs in your browser using the pdf-lib library. Your form, the values you type, and the filled output never touch our servers. Close the tab and there's no trace anywhere.

My Fill PDF Form job is stuck on "processing".

Refresh the page and try again. Browser-side processing depends on your device's CPU and RAM, so closing other tabs usually helps.

The downloaded file looks different from the preview.

Clear your browser cache and re-run the job. Outdated cached fonts can occasionally cause rendering glitches. If the issue persists, email us a sample to help@pdfwix.com.

Can I undo a Fill PDF Form operation?

Your original file is never modified — PDFWix always produces a new file. Just discard the new version and start again with the original.

How to Fill PDF Form: A Step-by-Step Guide

Fill out interactive PDF forms in your browser. AcroForms supported, files stay on your device. Free, no signup, no watermark.