MinoPDFFlatten PDF
Bake filled form fields and annotations into the page so they can no longer be edited, in your browser. Flattening re-renders each page as an image at the original size — a visual copy for final submission, not a way to lock or redact a PDF.
Runs in your browser
Files are never uploaded — they stay on your device.
No page limit
Any document size, no per-page caps or quotas.
No watermarks
Clean output with no branding added.
No sign-up
Just open the tool and use it — no email, no account.
How to verify
Verify in 3 steps
No promises to take on faith — check it yourself in about 30 seconds.
- 1Open DevTools → Network tab
- 2Add a file and run the tool
- 3Confirm: no request carries your file
Once the page has loaded you can also unplug the network — every tool keeps working.
Full method & limitsKey Features
Lock Form Fields
Bake filled form values into the page so recipients can no longer change them before you submit or share the document.
Bake In Annotations
Render comments, highlights, stamps and other annotations into the page image so they appear fixed and uneditable.
Original Page Size
Each page is re-rendered at its original dimensions, so the flattened PDF keeps the same page size and layout as the source.
Choose Pages & Quality
Flatten all pages or a chosen page range, and pick the render resolution (DPI) to balance clarity against file size.
Runs in Your Browser
Processing stays on your device. The PDF is never uploaded to a server, and the original file is not overwritten.
Honest About Limits
Flattening is a visual copy: text is no longer selectable, links and bookmarks are not preserved, and digital signatures are invalidated. Keep the original if you need those.
How to Use
Add your PDF
Drag and drop a PDF or select it from your device. The source file is not overwritten.
Choose what to flatten
Pick form fields, all annotations, or both. At least one option must be selected before you run.
Set pages and resolution
Choose a page range and a render DPI. Higher DPI keeps text sharper but makes a larger file.
Download the flattened PDF
Export the processed PDF and download a new copy where the chosen elements are baked into the page.
Flatten PDF Example
A signed form is flattened so the filled answers can no longer be edited before it is filed.
intake-form.pdf (3 pages, filled form)
The file contains a fillable form with typed answers and a couple of review stamps on the last page.
intake-form-flat.pdf (3 pages, values baked in)
Filled values and stamps are part of the page image. The form can no longer be edited, but the text is no longer selectable and any signature is invalidated.
How to Flatten a PDF
How to Flatten a PDF
You can flatten a PDF to lock filled form fields and annotations into the page so they can no longer be edited. Use the tool above to choose what to bake in, pick a page range and resolution, and download a new copy. The original file is not overwritten.
What Flattening Actually Does
Flattening re-renders each chosen page as an image and embeds it at the page's original size. Form values and annotations become part of that image, so they appear fixed and can no longer be edited. The result is a visual copy of the page, not a restructured PDF.
Quick Steps
- Add your PDF. Drag and drop the file or select it from your device.
- Choose what to flatten. Select form fields, all annotations, or both. At least one must be selected.
- Set pages and resolution. Choose a page range and a render DPI. Higher DPI keeps text sharper but makes a larger file.
- Download the flattened PDF. Export the processed file and keep the original separately.
Flattening Is Not Locking or Redaction
Flattening is easy to confuse with stronger operations, but they solve different problems:
- Flatten bakes form values and annotations into the page image. It is not encryption and adds no password.
- Password protection restricts who can open or edit the file. Flattening does neither.
- Redaction permanently removes visible content from the page. Flattening does not hide or delete underlying content.
If your goal is to stop people from reading sensitive text, use a redaction tool. If your goal is to stop people from editing a submitted form, flattening is the right step — but keep the original if you may need to revise it.
What Does Not Survive Flattening
Because the page becomes an image, several things are not preserved in the output:
- Selectable, searchable text.
- Clickable links and bookmarks.
- Document metadata (title, author, and so on).
- Valid digital signatures — re-rendering invalidates them.
For these reasons, keep the original PDF whenever you still need selectable text, working links, or a verifiable signature.
Choosing a Resolution
The render DPI controls how sharp the flattened page looks. Around 150 dpi is enough for screen viewing and printing; 300 dpi keeps small text crisper but produces a larger file. Very high DPI on many pages can create a file larger than some browsers can comfortably handle, so watch the size estimate and lower the DPI if needed.