Flatten PDF
Flatten PDF forms and annotations online to permanently merge fillable fields into the page. Create static, printable, non-editable copies.
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Start by picking a document from your computer.
Supported formats: PDF
Select files for Flatten PDF
or drop files here (Max 10MB)
or drop files here (Max 10MB)
How to use Flatten PDF
Upload your PDF
Click flatten
Download flattened file
Frequently Asked Questions
What does flattening a PDF do?
Flattening permanently merges all form fields, annotations, and comments into the page content so they can no longer be edited or filled interactively.
When should I flatten a PDF?
Flatten before final submission, archiving, or sharing when you want to ensure no one can modify the form entries after you have completed them.
Can I undo flattening?
No. Flattening is irreversible on the output file. Always keep a copy of the original fillable PDF before flattening.
Will flattening change how the PDF looks?
The visual appearance should remain the same. Form fields, checkboxes, and annotations become part of the page image exactly as they appeared when filled.
Does flattening reduce file size?
Flattening may slightly change the file size depending on the number of form fields, but it is primarily for locking content, not for compression.
When to use this tool
Flatten form fields and annotations into a static PDF so that interactive elements like text boxes and checkboxes become permanent parts of the page. The flattened result cannot be edited as a form.
- A filled form must be finalized before submission or archiving.
- Interactive elements should be locked to prevent further editing.
- Annotations or comments need to be permanently merged into the document.
Tips for best results
- Double-check form entries before flattening because the action cannot be undone.
- Keep a copy of the fillable original in case corrections are needed later.
- Verify that all fields rendered correctly in the flattened output.
Privacy and file retention
The PDF is temporarily processed to flatten form layers. Source and flattened files are scheduled for deletion within the normal 30-minute window.
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