Lock Form Fields
Turn filled form fields into fixed content so the values can no longer be edited or cleared.
Flatten PDF
Flatten a PDF so form fields, annotations, and content can no longer be edited. Keep text selectable or lock everything as images. Free, no signup, nothing uploaded.
Guide
How to flatten a PDF
1
Select Your PDF
Drag and drop a PDF or click to choose one. The tool reads it and shows the page and form field count.
2
Pick a Flatten Mode
Choose to flatten just the form fields and keep text selectable, or rasterize every page to lock all content.
3
Flatten and Download
Click Flatten and Download. A new, flattened PDF is saved straight to your device.
Make Your PDF Content Permanent
Flattening a PDF means merging its interactive parts, like form fields and annotations, into the page itself. After flattening, the values stay visible but can no longer be edited, selected as fields, or accidentally cleared. It is the step you want before sending a filled form, a signed document, or marked-up pages to someone else.
This tool gives you two ways to do it. Form mode flattens just the form fields and keeps the page text selectable and searchable, which keeps the file small and clean. Rasterize mode redraws every page as an image, locking annotations, layers, and anything interactive, which is the surest way to freeze a document exactly as it looks.
Both modes run in the browser. Your PDF is read, flattened, and rebuilt on your own device, so nothing is uploaded and the file never leaves your computer.
Benefits
Why Use Our Flatten PDF Tool?
Rasterize Everything
Redraw each page as an image to lock annotations, layers, and interactive parts in one pass.
Keep Text Selectable
In form mode the page text stays selectable and searchable, only the fields are flattened.
Print and Share Ready
A flattened PDF looks the same everywhere and prints without missing or shifting field values.
Stops Accidental Edits
Once flattened, no one can change the answers in a form or move an annotation by mistake.
Runs in Your Browser
Your PDF is read and rebuilt on your device. Nothing is uploaded, logged, or stored.
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FAQ
Frequently Asked Questions
Common questions about flattening PDFs.
What does it mean to flatten a PDF?
Flattening merges interactive parts like form fields and annotations into the page. The content stays visible but can no longer be edited as fields, which keeps a filled form or marked-up file fixed.
What is the difference between the two modes?
Form mode flattens only the form fields and keeps the page text selectable and searchable. Rasterize mode redraws every page as an image, which locks all annotations and layers but makes the text no longer selectable.
Will flattening change how my PDF looks?
No. The visible content stays the same. Flattening only changes whether parts of it can still be edited, not how the page appears.
Can I still select text after flattening?
In form mode, yes, the page text stays selectable. In rasterize mode the pages become images, so the text can no longer be selected or searched.
Does my file get uploaded anywhere?
No. The PDF is read and rebuilt entirely in your browser. Nothing is uploaded, logged, or stored on a server.
Is this flatten PDF tool free?
Yes, it is completely free with no signup and no limits. Everything runs on your device.