Free · Private · In your browser

Flatten PDFLite

Best effort: re-renders pages to flatten interactive form fields.

Drop your files here, or click to browse
Processed on your device — nothing is uploaded

How your files are handled

We built these tools so you never have to wonder where your documents go. Here is exactly what happens when you use them.

  • Your files are processed entirely in your browser using open-source libraries (pdf-lib, PDF.js, and others).
  • Nothing is uploaded to our servers. We have no backend that receives, stores, or scans your documents.
  • We cannot see, store, or access your files — not during processing, not after, not ever.
  • Processing uses your device's memory and CPU. Large files may take longer, especially on phones and tablets.
  • All tools are free with no paywall tricks, no hourly task limits, and no watermarks on your output files.

How it works

Three simple steps. Your files never leave your device, and the result downloads straight to your computer or phone.

Frequently asked questions

Common questions about privacy, pricing, and how these tools work.

More optimize tools

Other free PDF utilities that work the same way — private, in-browser, no sign-up.

How to flatten PDF

Flatten PDF bakes interactive form fields into fixed page content so their values can no longer be changed. You can flatten just the form or rasterize the whole document.

  1. Add your PDF; flattening happens on your device with no upload.
  2. Choose Flatten form fields to freeze form values while keeping text selectable, or Rasterize everything to turn pages into images.
  3. Click Flatten PDF to apply your choice.
  4. Preview and download the flattened document.

Everything happens in your browser — your file is never uploaded, and there is no sign-up, watermark, or limit.

Frequently asked questions

Are my files uploaded to a server?

No. Every tool runs entirely in your browser using open-source libraries, so your file is processed on your own device and is never uploaded. We have no backend that receives, stores, or scans your documents.

Is it really free, and will there be a watermark?

Yes. There is no account, no sign-up, and no hourly limit, and the tools never add a watermark to your output. UnboundPDF is free and is not affiliated with Adobe.

Does it work on a phone or tablet?

Yes. The tools run in any modern mobile browser as well as on desktop. Because the work uses your device's own memory and processor, very large files simply take longer on phones.

What does flattening a form do?

It converts filled-in form fields into permanent page content, so the values display everywhere but can no longer be edited. Text stays selectable in this mode.

What if my PDF has no form fields?

Then there is nothing to flatten, and the tool says so. You can still choose Rasterize everything to freeze all content as images.