# How to Flatten PDF Documents Easily

*Upload your PDF to merge layers, forms, and annotations into a single static document.*

Flatten PDF online free to make forms and annotations permanent

Page: <https://products.documentize.app/zh-Hans/flatten-pdf>

Flattening a PDF is essential when you need to lock document content, preserve layout, and ensure that forms, comments, and layers display consistently across devices. By converting interactive elements into static content, flattening prevents unintended changes and simplifies document sharing.

## How to

- **Select files** You can select files from the file system, Dropbox and Google Drive.
- **Press button "Flatten"** in order to upload files for processing.
- **Wait for completion** It will take from 10 seconds to several minutes depending on the number and size of the files.

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