Flatten PDF Online — Free
Flatten your PDF to merge form fields, annotations, and digital signatures into permanent static content. The resulting PDF looks identical but can no longer be edited through form tools.
How to Flatten a PDF
- 1Upload your PDF
Drag and drop or click to upload a PDF file (up to 100 MB).
- 2Review what will be flattened
All form fields, annotations, comments, and highlights will be merged into page content.
- 3Flatten
Click the Flatten PDF button — the process takes seconds.
- 4Download
Download the flattened PDF. All interactive elements are now baked into the page.
Frequently Asked Questions
What does flattening a PDF mean?
Flattening converts interactive elements like form fields, checkboxes, and digital signatures into static images embedded in the page — they look the same but can no longer be changed.
Is flattening reversible?
No. Flattening is permanent. Always keep a backup of the original before flattening.
When should I flatten a PDF?
Flatten a PDF before sharing when you want to prevent others from editing form data, or before archiving to ensure long-term compatibility.
Does flattening affect the file size?
Usually not significantly. Form fields converted to static content have similar file sizes.