How is this different from other online PDF tools?

Most online PDF tools send your files to a remote server for processing. This tool processes everything locally in your browser using client-side JavaScript. Your files are never transmitted to any server, which means your document content stays entirely under your control.

Are my PDF files uploaded?

No. Your files are read directly by your browser. Your files are never transmitted over the network. The tool works entirely within the browser tab you have open.

Can I verify that files are not uploaded?

Yes. Open your browser's developer tools (F12), go to the Network tab, and watch for any outgoing requests while using the tool. You will see no file data leave your browser. The site may record an anonymous page-view count, which never includes your files and can be disabled.

Does this tool work offline?

Yes, once the page has loaded the tool processes your files entirely in your browser; tool functionality needs no network connection. You can disconnect from the internet and continue using it.

What happens when I refresh the page?

Because nothing is stored on a server, refreshing the page clears your current session. Any files you had selected will need to be selected again.

Does this tool store my files?

No. Files are held in browser memory only for as long as the page is open. Closing or refreshing the page discards them. Nothing is written to disk by the tool, and nothing is sent to a server.

Can this tool unlock password-protected PDFs?

No. This tool does not attempt to remove or bypass PDF password protection. If you know the password, the Unlock PDF tool on this site can remove it locally; then this tool can process the file.

What technologies does this tool use?

This tool uses client-side JavaScript and pdf-lib to read the PDF's AcroForm fields and write your values — your files never leave your browser.

Does this tool use WebAssembly?

No. This tool uses client-side JavaScript and pdf-lib for local PDF structure editing. No WebAssembly is involved.

Can I make my answers permanent so nobody can edit them?

Yes. Tick the flatten option before saving: the values are baked into the page content and the interactive fields are removed, exactly like the standalone Flatten tool.

How do I fill in a PDF form with this tool?

Pick a PDF from your device with the file picker, and every fillable field is listed automatically. Type into the text boxes, tick checkboxes, and choose entries from dropdowns or radio groups, then select Fill to save the completed PDF back to your device. Everything happens locally in your browser.

Why are some fields greyed out and unchangeable?

Those fields are marked read-only inside the PDF itself, so the tool shows them for reference but disables editing and leaves their values untouched when saving. This matches how the original form was authored; the tool does not override the document's read-only flag.

Why won't my dropdown or radio choice save?

Dropdowns, option lists, and radio groups accept the choices defined in the PDF, so a value that is not among the listed options is rejected with an error. Pick from the provided options, or leave it unset to keep the field's current value.

Does it cost anything to fill in PDF form fields here?

Filling in PDF form fields — text boxes, checkboxes, dropdowns, and radio buttons — is completely free, requires no account or sign-up, and there is no cap on how many forms you work through; it always will be free. Every field you type or select is written to your PDF entirely inside your browser by pdf-lib, so your form data and the document itself never leave your device.

Fill a PDF Form Privately — In Your Browser

Select a PDF with form fields; every fillable field is listed so you can type or pick values, then the filled PDF is saved locally — optionally flattened so the values can no longer be edited.

Quick answer

What it does: Select a PDF with form fields; every fillable field is listed so you can type or pick values, then the filled PDF is saved locally — optionally flattened so the values can no longer be edited.
Free?: Yes — 100% free, no account or sign-up.
Files uploaded?: No — everything is processed in your browser.
Works offline?: Yes — once the page has loaded.
Best for: A job applicant fills in a downloadable application PDF — name, address, employment history — without printing or scanning.
Good to know: Only AcroForm fields are supported — XFA forms (used by some government agencies) and signature fields are not.

How it works

Select a PDF file from your device using the file picker.
The file is read into browser memory — no data leaves your browser.
Every fillable field is listed: text boxes, checkboxes, dropdowns, option lists, and radio groups.
Type or pick the values you want; read-only fields stay untouched.
pdf-lib writes the values (optionally flattening the form) and the filled PDF is offered as a download.

When to use this tool

A job applicant fills in a downloadable application PDF — name, address, employment history — without printing or scanning.
A freelancer completes a client intake form with checkboxes and dropdowns, then flattens it so the answers cannot be edited later.
A tenant fills in a rental agreement PDF and saves a local copy; form data never passes through a third-party server.
Only AcroForm fields are supported — XFA forms used by some government agencies are not; check that the form shows fillable fields.

Frequently asked questions

How is this different from other online PDF tools?: Most online PDF tools send your files to a remote server for processing. This tool processes everything locally in your browser using client-side JavaScript. Your files are never transmitted to any server, which means your document content stays entirely under your control.
Are my PDF files uploaded?: No. Your files are read directly by your browser. Your files are never transmitted over the network. The tool works entirely within the browser tab you have open.
Can I verify that files are not uploaded?: Yes. Open your browser's developer tools (F12), go to the Network tab, and watch for any outgoing requests while using the tool. You will see no file data leave your browser. The site may record an anonymous page-view count, which never includes your files and can be disabled.
Does this tool work offline?: Yes, once the page has loaded the tool processes your files entirely in your browser; tool functionality needs no network connection. You can disconnect from the internet and continue using it.
What happens when I refresh the page?: Because nothing is stored on a server, refreshing the page clears your current session. Any files you had selected will need to be selected again.
Does this tool store my files?: No. Files are held in browser memory only for as long as the page is open. Closing or refreshing the page discards them. Nothing is written to disk by the tool, and nothing is sent to a server.
Can this tool unlock password-protected PDFs?: No. This tool does not attempt to remove or bypass PDF password protection. If you know the password, the Unlock PDF tool on this site can remove it locally; then this tool can process the file.
What technologies does this tool use?: This tool uses client-side JavaScript and pdf-lib to read the PDF's AcroForm fields and write your values — your files never leave your browser.
Does this tool use WebAssembly?: No. This tool uses client-side JavaScript and pdf-lib for local PDF structure editing. No WebAssembly is involved.
Can I make my answers permanent so nobody can edit them?: Yes. Tick the flatten option before saving: the values are baked into the page content and the interactive fields are removed, exactly like the standalone Flatten tool.
How do I fill in a PDF form with this tool?: Pick a PDF from your device with the file picker, and every fillable field is listed automatically. Type into the text boxes, tick checkboxes, and choose entries from dropdowns or radio groups, then select Fill to save the completed PDF back to your device. Everything happens locally in your browser.
Why are some fields greyed out and unchangeable?: Those fields are marked read-only inside the PDF itself, so the tool shows them for reference but disables editing and leaves their values untouched when saving. This matches how the original form was authored; the tool does not override the document's read-only flag.
Why won't my dropdown or radio choice save?: Dropdowns, option lists, and radio groups accept the choices defined in the PDF, so a value that is not among the listed options is rejected with an error. Pick from the provided options, or leave it unset to keep the field's current value.
Does it cost anything to fill in PDF form fields here?: Filling in PDF form fields — text boxes, checkboxes, dropdowns, and radio buttons — is completely free, requires no account or sign-up, and there is no cap on how many forms you work through; it always will be free. Every field you type or select is written to your PDF entirely inside your browser by pdf-lib, so your form data and the document itself never leave your device.