Flatten PDF
Lock fillable form fields into the page.
Runs in your browserIn: PDFOut: PDF
Runs in your browser — your file never leaves your device.
About this tool
Flatten fillable AcroForm fields into the page so their values become permanent and can't be edited. Other annotations and layers are kept as-is.
This tool processes files entirely on your device. Nothing is uploaded to a server.
How it works
- 1Open a PDF with fillable form fields.
- 2We flatten those AcroForm fields into the page content.
- 3Download a PDF whose field values can no longer be edited.
Common questions
Is my file uploaded when I use Flatten PDF?
No. This tool runs entirely in your browser with WebAssembly and browser APIs — the file stays on your device from start to finish.
Does Flatten PDF work offline?
Not fully — the page and its processing engine load over the network, with the engine fetched when you first use the tool. After that, the processing itself runs entirely on your device, and a dropped connection does not interrupt work in progress.
How large can my file be?
Up to 100 MB per file.
Related tools
All toolsNo sign-up required. Your files stay on your device until you run a tool.