Home / Tools / Fill PDF Form
Fill PDF Form Online
Fill out interactive PDF forms in your browser. AcroForms supported, files stay on your device. Free, no signup, no watermark.
Fill PDF Form Online
Fill out interactive PDF forms in your browser. AcroForms supported, files stay on your device. Free, no signup, no watermark.
Why fill PDF forms with PDFWix?
- AcroForms detected automatically: Drop a PDF; we list every fillable field and pick the right input type per field — text, checkbox, radio, dropdown, multi-select. No manual mapping.
- Honest about XFA: If the PDF is XFA (Adobe LiveCycle), we say so clearly and point you to Adobe Reader. Most modern govt forms are AcroForms — XFA is a shrinking minority. Better to know than to silently get a broken file.
- Optional flatten: Toggle on to bake values permanently into the page (for final submission), or off to keep editing later. Most other tools either always flatten or never do.
- Files stay on your device: The whole pipeline runs in your browser via pdf-lib. Tax forms, SSNs, salary numbers, signatures — none of it ever reaches our servers.
- Read-only fields respected: Fields the form's author marked as read-only (e.g. calculated totals on tax forms) are shown but disabled — we don't pretend to write where the form forbids it.
- Free, no signup, no watermark: Fill as many forms as you need without a paywall. The output PDF has no PDFWix branding.
Common uses for filling PDF forms
- Filling a current IRS W-9 to send to a new client
- Completing a 1040 draft before printing for tax-prep meeting
- Onboarding paperwork from a new employer (I-9 page 1, W-4, direct deposit forms)
- Apartment rental applications and lease addendums
- Insurance claim forms and HSA reimbursement requests
- School permission slips and after-school enrollment forms
Tips for filling PDF forms
- Drop in your fillable PDF — Click "Select PDF form" or drag a PDF with form fields into the upload box. We read it instantly in your browser — nothing is uploaded.
- Review the detected fields — We auto-detect every AcroForm field — text, checkboxes, radio groups, dropdowns, multi-select lists — and render the matching input for each one. Field labels come from the form's internal field names.
- Type or pick your answers — Fill in only the fields you need. Read-only fields (like calculated totals) are shown but disabled. Signature fields are skipped here — use Sign PDF after you finish filling.
- Flatten if you're done editing — Toggle "Flatten before download" on for a final submission copy — the values become part of the page and can't be re-edited. Leave it off if you want to keep filling later.
- Download the filled PDF — The result is named yourfile-filled.pdf. Reopen in Adobe Reader, Preview, or any browser to confirm the values are in place.
Related tools
Frequently asked questions
I dropped my PDF and got 'No fillable fields found.' What now?
Your PDF doesn't have AcroForm fields baked in — visually the boxes are just lines on the page. Use Edit PDF to add text overlays anywhere on a non-fillable PDF, or Sign PDF if you only need to add a signature.
Does PDFWix support government forms?
Most modern IRS forms (1040, W-9, W-2 series), and the majority of HR and federal application forms, are AcroForms — those work here. Some older USCIS forms and a handful of state DMV forms are XFA (Adobe LiveCycle). We detect XFA and clearly tell you to use Adobe Reader instead.
Can I save the form without flattening so I can keep editing later?
Yes. Toggle "Flatten before download" off. The downloaded PDF keeps its form fields intact — reopen it in PDFWix, Adobe Reader, or any other AcroForm-aware viewer to continue filling.
Is filling private? Where does my data go?
Filling runs entirely in your browser using pdf-lib (a JavaScript PDF library). Your form, your typed values, and the resulting filled PDF never reach our servers. Close the tab and there's no record anywhere.
Why are some checkboxes greyed out and not editable?
Those fields are marked read-only by the form's author — usually because they're auto-calculated (e.g. a total on a tax form) or are intended to be filled by another party. Adobe Reader behaves the same way; we don't pretend to write where the form forbids it.
Need to add a signature too? After filling, run the result through Sign PDF. For non-fillable PDFs (no AcroForm fields), use Edit PDF to add text overlays anywhere. To lock the filled form before emailing, use Protect PDF.