What Fill Forms does
PDFGrover's Fill Forms tool detects the interactive fields in a fillable PDF (AcroForm) and gives you a browser UI to type or click into them, then saves a filled copy. Because it reads the form's real field definitions, your input lands exactly where it belongs — not as a floating overlay that drifts when printed.
When to use Fill Forms
- Government forms — tax, immigration, DMV, benefits paperwork (most modern gov PDFs are fillable AcroForms).
- Bank & lender paperwork — KYC forms, loan applications, signature cards.
- Employer onboarding — I-9s, expense claims, leave requests.
- Education — applications, scholarship and transcript forms.
How to fill a PDF form
- Upload a fillable PDF (up to 100 MB).
- Fill the fields — the tool lists every text box, checkbox, radio button, and dropdown it finds; type or click to complete them.
- Save — your values are written into the form and the filled PDF downloads.
Input limits
- Up to 100 MB per PDF
- Must contain AcroForm fields (the standard PDF forms format)
Supported field types
- Text — single-line and multi-line text input
- Checkbox — toggle on/off
- Radio button — pick one of a group
- Dropdown / combo box — pick from a list
Unsupported field types are shown in the preview but cannot be filled through this tool: signature fields (use Sign PDF instead), and any XFA-based fields (a different, older forms technology used mostly in enterprise workflows).
What "save" produces
- A filled AcroForm — the form remains interactive; recipients can still change your answers. Good for forms that will be further reviewed or counter-signed.
- To lock the answers so recipients can't change them, run the filled PDF through Flatten PDF afterwards. That bakes the current values into the page content.
When this tool is the right choice
- Government forms from tax authorities, immigration, the DMV, social security — most modern gov PDFs use AcroForm and are fully fillable here
- Bank and lender paperwork — KYC forms, loan applications, signature cards
- Employer onboarding — I-9s, expense reports, leave requests
- Educational forms — applications, scholarship paperwork, transcript requests
When to use a different tool instead
- No fillable fields detected — if you upload the PDF and the field count is 0, the PDF is either a flat scan (image of a form, not a fillable PDF — use Edit PDF to overlay text on top) or an XFA-based form (older Adobe LiveCycle, only works in Acrobat itself)
- Signature-only workflows — use Sign PDF when you just need to add a signature, initial, or date
- Locking the answers — fill here first, then run the output through Flatten PDF to bake the current values in so recipients can't edit them
Tips
- Filled values stay in your browser tab only; refreshing the page resets everything. There's no autosave — that's intentional, since no-account privacy is the whole point.
- The visual field overlay can drift a pixel or two from the printed field position on very high-DPI source PDFs. The data still saves correctly even when the visual offset looks off.
- Up to 100 MB per upload is the hard cap.
Privacy and file handling
Fill Forms runs entirely in your browser — your field values and the PDF stay on your device. Nothing is uploaded, stored, or logged, and there's no autosave (intentional — no-account privacy is the point). No sign-up, no watermark.