Free Bulk PDF Flattener
Lock in filled-in forms, comments, highlights and stamps on lots of PDFs at once. They become part of the page, so nobody can edit them, and they print and display the same everywhere. Everything happens in your browser, so nothing is uploaded.
Quick human check, then the tool unlocks:
Drop PDF files or whole folders here
The same settings are used for every PDF.
How to flatten PDFs in bulk
- Drop in your PDFs, or press Choose a folder.
- Choose what to flatten: form fields, comments and stamps, or both.
- Press Flatten PDFs, then download each PDF or everything as one ZIP that keeps your folder layout.
🔒 Your PDFs are flattened by your own browser and are never uploaded to our server.
When to flatten
- Sending a completed form: the answers can't be changed afterwards, and they show up in every app, including phones that hide form fields.
- Sharing reviewed documents: comments and highlights are fixed in place.
- Before printing or combining: some printers and tools drop form fields and comments.
- Flattening can't be undone, so keep your original if you may need to edit it again.