Auto-detects every field
Scans every page and surfaces text boxes, checkboxes, radio groups, dropdowns, and option lists — no setup, no mapping.
NEW — 100% Private
PDF Form Filler — fill AcroForm fields online
Open any fillable PDF and type straight into its fields — text boxes, checkboxes, radios, dropdowns. Your file is never uploaded; everything happens in your browser.
- No upload
- 100% private
- No signup
- Auto-detects fields
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A PDF form filler reads the interactive AcroForm fields a PDF already contains and lets you type into them directly in your browser — no printing, no scanning, no desktop software. The tool detects text boxes, checkboxes, radio buttons, dropdowns, and list boxes automatically, then writes your answers back into the same fields when you download.
TryDocsy's PDF Form Filler runs entirely in your browser using pdf-lib and PDF.js. The original AcroForm structure is preserved, so the filled PDF opens in every reader (Adobe Acrobat, Preview, Chrome, mobile viewers) and the answers render exactly where the author intended. Nothing is uploaded — every keystroke and the final export happen on your device.
When a PDF has no AcroForm, Smart Fill kicks in. It scans the visible text and drawn lines on every page, recognises common labels (Name, Email, Date, Signature, and more), and synthesises editable form fields right where the blanks are. Each detected field shows a confidence band — high, medium, or review — so you know which ones to double-check.
Common uses include filling job applications, government forms, tax documents, lease agreements, medical intake forms, and any PDF that came with grey rectangles instead of editable cells. After filling, you can optionally flatten the form to lock the answers in place before sharing.
How to fill a PDF form
- 1
Upload the fillable PDF — the file is processed locally in your browser; nothing is sent to a server.
- 2
If the PDF already has AcroForm fields, the tool scans every page and surfaces every interactive field it finds: text boxes, checkboxes, radio groups, dropdowns, and option lists. If it has none, Smart Fill runs automatically to find Name, Email, Date, Signature, and similar fields by reading the labels on the page.
- 3
Click any field on the page preview and type, tick, select, or pick. The sidebar lists every field by name with quick-jump, per-field reset, and confidence pills for Smart-detected fields.
- 4
Optionally enable "Flatten (lock answers)" to bake the values into the page content — once flattened, the answers can no longer be edited.
- 5
Click "Download filled PDF" to save the result. The file keeps the original layout and opens identically in any PDF reader.
What this form filler does
Stays editable, or locks answers
By default the form stays interactive so the recipient can adjust. Tick "Flatten" to bake the answers into the page for a final, locked copy.
Reads every AcroForm field
Backed by pdf-lib, the same engine Adobe Acrobat uses for AcroForm — every standard field kind renders and writes back correctly.
100% private
Detection, editing, and export all run locally. Your PDF never touches a server, so it's safe for tax, medical, and government documents.
Works on any device
Fully responsive — the page preview zooms, the field controls scale, and on-screen keyboards work for long-form text fields.
Free, no signup
No account, no watermark, no file limit beyond a sane browser-memory ceiling. Open the page and fill.
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Frequently asked questions
What types of PDF fields does this tool support?
TryDocsy's PDF Form Filler supports every standard AcroForm field kind: text (single-line and multiline), checkboxes, radio button groups, dropdowns, and option lists (multi-select). On top of that, Smart Fill detects labels like Name, Email, Phone, Date, and Signature on flat PDFs and synthesises editable fields for them automatically.
Will my PDF upload to a server?
No. Detection, editing, and the final export all run in your browser using pdf-lib. Your PDF is never uploaded, logged, or transmitted anywhere.
What is Smart Fill and how does it work?
Smart Fill is the auto-detect layer for PDFs without AcroForm. It reads the text layer with PDF.js, tokenises the drawing ops with the same parser the PDF Editor uses, and runs a small label dictionary (English + Hindi) to match common field names. For each match it picks a blank region using one of three strategies — drawn underline, adjacent whitespace, or a safe fallback — and emits a confidence score so you can see how sure the engine was. Detected fields are converted to real AcroForm widgets before download.
What does the confidence pill on a Smart-Fill field mean?
High (green) means the engine found a clear label match with a drawn underline or box to fill into. Medium (amber) means a label match was found but the blank was inferred from surrounding whitespace. Low (orange) means the engine had to fall back to a default-sized region — review these carefully before downloading.
What happens when I tick "Flatten (lock answers)"?
Flattening bakes your values into the page content and removes the interactive field annotations. The result opens like a normal PDF and cannot be re-edited — ideal for a final, share-ready version. Leave the box off if you want recipients to still be able to change a value.
My PDF has no fillable fields — what now?
Click "Auto-detect form fields". Smart Fill scans the visible text and drawn lines on every page to synthesise editable fields for common labels (Name, Email, Phone, Date, Signature, and more). For scanned image PDFs, run it through PDF OCR first to create a real text layer.
Are my values preserved when the recipient opens the file?
Yes. pdf-lib writes the values back into the AcroForm dictionary, then regenerates each field's appearance stream so it renders identically in Adobe Reader, macOS Preview, Chrome's built-in viewer, and on iOS and Android.
Why are some fields greyed out?
Read-only fields are part of the PDF's design — the original author marked them as informational. TryDocsy respects that flag, just like Acrobat does, and shows them disabled with a lock badge. They can still be filled by name via flatten if you really need to override them.
Can I fill a scanned PDF form?
Only after OCR. A scanned PDF is just an image, so pdf-lib can't find any fields to fill. Run it through the PDF OCR tool first — TryDocsy creates real AcroForm fields from the recognized text and the output then opens normally in this Form Filler.
Will this work on my phone?
Yes. The tool is fully responsive and supports on-screen keyboards, touch-friendly field controls, and pinch-to-zoom on the page preview. All processing still happens locally on your device.