FileopiaFlatten PDF
Flatten fillable PDF forms and annotations so values can no longer be changed, or flatten every page into an image. Free and private.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Flatten PDF
- Select your PDF.
- Choose forms only or everything.
- Click Start and download.
When you send a completed form, the recipient can usually still edit its fields. Flattening merges field values and annotations into the page so the form looks the same everywhere and cannot be casually changed.
Common uses
- Lock a completed application or tax form before submitting it.
- Make sure comments and stamps display in every viewer.
- Fix forms whose fields show blank on phones or in some printers.
Tips for best results
- Use "Form fields only" to keep text selectable.
- "Everything" mode turns pages into images – stronger, but text cannot be selected.
- Keep an unflattened copy in case you need to edit later.
Why flatten forms
Interactive form fields can display differently between viewers and can be edited after you submit them. Flattening locks the values into the page so what you send is exactly what the recipient sees.
Why use Fileopia for Flatten PDF?
| Fileopia | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Your files never leave your device
Flatten PDF runs entirely in your browser using JavaScript and WebAssembly. Your files are read from your disk into this tab, processed in memory and saved straight back to your downloads folder – they are never uploaded to Fileopia or any third party.
- Test it yourself: once this page has loaded, switch off Wi‑Fi or mobile data and run the tool – it keeps working.
- Check the network: open your browser’s developer tools (F12 → Network) while processing; you will see no file upload requests.
- Nothing to delete: close the tab and the data is gone – there is no server copy, no retention period and no account.
Frequently asked questions
Will text remain searchable?
Yes with Form fields only. Everything mode turns pages into images.
Will text remain searchable?
Yes in Form fields only mode. Everything mode converts pages to images.
Is Flatten PDF really free?
Yes. Every tool on Fileopia is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Fileopia processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. Fileopia works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.