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Fill in a PDF form online

Drop a fillable PDF and every field appears as a simple form, labeled with the words beside it. Type your answers and save a PDF that keeps them, or lock them in. Nothing is uploaded.

Fill PDF Form

Settings appear once you add a PDF form.

Lock the answers in The answers become part of the page and can no longer be edited — what most offices want when a form is submitted. Leave it off to keep the form fillable.

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  • 100% private Your PDF form never leaves this device. Everything runs in your browser.
  • No limits No file-size cap, no watermark, no sign-up and no daily quota. Free.
  • Works offline Once this page has loaded, the tool keeps working without a connection.

How to fill in a PDF form online

  1. Add your PDF form: Drop the fillable PDF. Its fields are read in your browser and listed page by page, each labelled with the question printed next to it.

  2. Check the settings: Type your answers, tick the boxes and pick the options. Signature boxes are marked; sign them with Sign PDF afterwards.

  3. Save the result: Save. Keep the form fillable for later changes, or lock the answers in before you send it.

Why it doesn’t upload

Forms ask for exactly the details you would least want copied: names, addresses, dates of birth, tax and passport numbers, medical history. Online form fillers receive every answer on their servers. Here the form is read and written inside your browser, and the answers exist only in this tab until you save.

Check it in your browser’s Network tab

Worth knowing

  • This fills forms that have real fields — the ones you can click into in a PDF viewer. A PDF that is only printed lines and boxes has nothing to fill; give it fields with Make PDF Fillable, or write on it with Edit PDF’s Add text tool.
  • XFA forms, made with Adobe LiveCycle and common on some government sites, can only be filled in Adobe’s own apps. The tool says so when it finds one.
  • Calculated fields (totals worked out by the form’s own scripts) are not recalculated, because a form’s scripts never run here. Type the total yourself.
  • Labels come from each field’s own description or the printed words next to it; on a busy layout a label can pick up the wrong words. The page number is always shown, so check against the original when in doubt.
  • Answers in Chinese, Japanese or Korean aren’t supported by the embedded font yet.

Under the hood

What happens to your file

The form’s AcroForm fields are read with pdf-lib: text boxes, checkboxes, radio groups, dropdowns and lists. Each is labelled from its tooltip (/TU) or the words pdf.js finds printed beside it. Answers are written into the fields and their appearances regenerated so every viewer shows them; locking flattens the appearances into the page.

Runs on pdf-libpdf.js

Reference: pdf-lib documentation · ISO 32000-2 (PDF 2.0)

Why fill PDF forms in your browser?

Fillable PDF forms are awkward on phones and in some browsers, and filling them on an upload site sends your answers — names, addresses, ID numbers — to someone else. Here every field appears as a simple list labeled with the words beside it, you type your answers and save a PDF that keeps them.

Lock the answers in to make sure they show in every viewer and can’t be changed by the recipient.

Common forms people fill in as PDFs

  • Government and tax forms

    Complete official fillable forms without printing.

  • Job and rental applications

    Fill application forms and save them to attach.

  • Medical and insurance forms

    Answer intake and claim forms on any device.

  • School forms

    Fill enrollment and permission forms.

  • Forms that arrive blank

    Lock answers in so they don’t vanish in the recipient’s viewer.

Tips for filling PDF forms

  1. Turn on Lock the answers in for forms you’re submitting.
  2. Totals calculated by the form’s own scripts don’t update — type them yourself.
  3. A form with only printed boxes has no fields. Add some with Make PDF Fillable, or type onto it with Edit PDF’s Add text.
  4. XFA forms from Adobe LiveCycle only work in Adobe’s apps; the tool will tell you.
  5. Sign afterwards with Sign PDF.

Questions

How do I fill out a PDF form without Adobe?

Drop the PDF here; its fields appear as a normal web form. Fill them in and press Save filled PDF. The answers are written into the PDF’s own fields, so they show up in any viewer, including Adobe Reader.

What does “Lock the answers in” do?

It flattens the form: your answers are drawn into the page and the fields are removed, so nobody can change them afterwards and every printer shows them the same way. Many offices ask for this. Keep a fillable copy too if you might need to change something.

Why does it say my PDF has no fillable fields?

Some forms are just printed lines, made to be filled by hand. They have nothing to type into. Make PDF Fillable adds real fields on those lines, or use Edit PDF and its Add text tool to write on them.

Can I save my progress and finish later?

Yes. Save without locking, and the file keeps your answers in fillable fields. Drop it here again later and they are all still there to change.

How do I sign the form after filling it?

Save it here first, then open Sign PDF and drop the filled form in. Draw or type your signature and place it in the signature box.

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