Flatten PDF – Make Documents Read-Only
When you fill out a PDF form or add comments, these elements exist as separate "layers" that can be edited, moved, or deleted by others. Harsh Cyber Cafe’s Flatten PDF Tool solves this by merging all layers into a single, uneditable background. We offer two powerful modes: Rasterize (converts to image for total security) and Flatten Forms (locks fields but keeps text searchable).
Why Flatten Your PDF?
Prevent Editing
Stop others from changing your form data, checkmarks, or text content.
Forms Only Mode
Need to keep text searchable? Use our smart "Forms Only" mode to lock just the fields.
100% Private
We process files in your browser. Your sensitive forms never leave your device.
Fix Print Issues
Flattening resolves common printer errors where layers don't print correctly.
Frequently Asked Questions (FAQ)
What is the difference between Rasterize and Flatten Forms?
'Rasterize' converts the whole page into an image, making it 100% uneditable but not searchable. 'Flatten Forms' locks the fields but keeps the text selectable and searchable.
Will my links still work?
If you choose 'Flatten Forms Only', yes. If you choose 'Rasterize', no, as the page becomes a static image.
Is it safe?
Yes. The entire process happens in your browser using WebAssembly. Your sensitive documents are never uploaded to any server.
Can I flatten a password-protected PDF?
You will need to unlock it first. If you upload a locked file, our tool will prompt you to remove the password before flattening.
Does it reduce file size?
'Flatten Forms Only' keeps the file size small. 'Rasterize' might increase file size slightly unless you select the 'Grayscale' option.