Flatten PDF is a browser-based PDF tool on PDFToolsBase. Flatten PDF: free flatten pdf in your browser. No server upload, no signup, no watermark. Works on Windows, Mac, Linux, iOS, Android. To use it, upload or drop your PDF and view the result directly in your browser — no signup and nothing to install.
Run flatten pdf in your browser. Free, private, no signup — your selected files are processed in your browser and are not uploaded to our server.
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Drop your file here
or click to browse from your device
Accepts: .PDF
Done
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About this Flatten PDF
Flatten your PDF’s form fields and annotations with our flatten pdf tool. Pages are rasterized into image-based PDF pages, so form fields, links, annotations, and selectable text become non-editable page images. Useful when sharing filled forms to prevent further edits.
Your privacy is the default. Your selected files are processed in your browser and are not uploaded to our server; all processing happens client-side using PDF.js, browser canvas, and pdf-lib. Closing the tab clears the working session from this page; downloaded files remain on your device.
This tool is free to use with no signup required. Large files may be limited by your browser’s memory and device performance. Part of PDF Tools Base, a privacy-first collection of 161 PDF utilities. Bookmark the page for next time, and explore related tools in the footer below.
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How to use the Flatten PDF tool
Drop your PDF (form or annotated document).
Click Process. Each page is rasterized so form fields, annotations, links, and selectable text become page images.
Download the flattened PDF.
Why use PDF Tools Base?
100% Browser-Based
Flatten PDF processes selected files in your browser. Your selected files are processed in your browser and are not uploaded to our server.
No Server Upload, No Signup
Your selected files are processed locally in your browser. No account, no server upload, no email needed.
No Watermark Ever
Outputs are clean. We never stamp our brand or a paywall watermark on your files.
Free to Use
No accounts and no signup. Use the tool as much as you need within reasonable browser limits.
Works on Every Device
Windows, Mac, Linux, iPhone, iPad, Android, Chromebook. Any modern browser.
Built on Open Source
Powered by PDF.js, browser canvas, and pdf-lib for browser-side PDF raster/rebuild workflows.
Common uses for flatten pdf
Lock forms
Prevent further editing after signing.
Make annotations permanent
Bake comments into the PDF.
Single-layer output
Simpler PDFs are easier to share.
Frequently asked questions
Is Flatten PDF safe to use?
Yes. Everything happens in your browser. Your selected files are processed in your browser and are not uploaded to our server. Closing the tab clears the working session from this page; downloaded outputs remain on your device until you delete them.
Do I need to register or sign in?
No. No account, no email, no sign-up. Open the page and start using the tool immediately. Free to use, no signup needed.
Is there a watermark on the output?
No. PDF Tools Base never adds a watermark or branding to your output. Your final file is clean — just what you produced from the original.
Is there a file size limit?
Phones may struggle with PDFs over 50–100MB; desktops may handle larger PDFs but can still fail on very large or complex files. Large PDFs may be slow or fail depending on browser memory, page count, render DPI/mode, and PDF complexity.
Does this work on mobile devices?
Yes. The tool works on all modern mobile browsers: Chrome on Android, Safari on iOS, Firefox, Edge, Brave. The drag-and-drop also accepts files from your phone’s file manager.
Related PDF tools
Other PDF utilities in the same category — all free and browser-based.