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 flatten the form fields into static page content entirely within your browser — 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.

How do I flatten a filled PDF form here?

Pick a filled PDF with the file selector, then click the flatten button. The tool reads the file into your browser's memory, bakes each field's current value into the page using pdf-lib, and offers a download named flattened.pdf — all without anything leaving your device.

I flattened my PDF but it says no fields were flattened — why?

The tool counts the interactive form fields it finds, and a document with no AcroForm fields simply gets re-saved as-is. If you expected fields, the PDF may have flat printed text that just looks like a form, or the values may live in annotations rather than real form fields.

Can I edit the form again after flattening, or change the values back?

No — flattening is one-way. Once the field values are baked into the page content and the interactive widgets are removed, the text becomes static page content, so keep your original file if you might still need an editable copy.

Does the Flatten PDF Form tool cost anything to use?

Flatten PDF Form is completely free — no account, no sign-up, and no cap on how many forms you flatten, and it always will be. Every step happens inside your own browser: pdf-lib bakes each field's filled value into the page content right on your device, so your document is never sent anywhere. Download the locked, non-editable PDF the moment it's ready, at no cost and with no data leaving your browser.

Flatten a PDF Form Privately — Lock In Field Values in Your Browser

Select a filled PDF form and download a flattened copy whose field values are baked into the page and no longer editable — all locally in your browser.

Quick answer

What it does: Select a filled PDF form and download a flattened copy whose field values are baked into the page and no longer editable — all locally in your browser.
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: An HR coordinator flattens a completed onboarding form before emailing it to lock in values and prevent edits.
Good to know: Flattening is one-way: once flattened, the fields can no longer be edited as a form.

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.
pdf-lib bakes each form field's current value into the page content and removes the interactive widgets.
The flattened PDF is offered as a download directly from your browser.

When to use this tool

An HR coordinator flattens a completed onboarding form before emailing it to lock in values and prevent edits.
A notary flattens a digitally completed application before printing so all field values appear as visible page text.
An admin locks checked checkboxes on a PDF questionnaire before sharing a read-only copy with management.
Flattening is permanent and one-way: form fields become static page content and cannot be re-opened or edited afterward.

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 flatten the form fields into static page content entirely within your browser — 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.
How do I flatten a filled PDF form here?: Pick a filled PDF with the file selector, then click the flatten button. The tool reads the file into your browser's memory, bakes each field's current value into the page using pdf-lib, and offers a download named flattened.pdf — all without anything leaving your device.
I flattened my PDF but it says no fields were flattened — why?: The tool counts the interactive form fields it finds, and a document with no AcroForm fields simply gets re-saved as-is. If you expected fields, the PDF may have flat printed text that just looks like a form, or the values may live in annotations rather than real form fields.
Can I edit the form again after flattening, or change the values back?: No — flattening is one-way. Once the field values are baked into the page content and the interactive widgets are removed, the text becomes static page content, so keep your original file if you might still need an editable copy.
Does the Flatten PDF Form tool cost anything to use?: Flatten PDF Form is completely free — no account, no sign-up, and no cap on how many forms you flatten, and it always will be. Every step happens inside your own browser: pdf-lib bakes each field's filled value into the page content right on your device, so your document is never sent anywhere. Download the locked, non-editable PDF the moment it's ready, at no cost and with no data leaving your browser.