FileopiaOverlay PDF Files
Merge two PDFs page-on-page: put a letterhead, form background or stamp on top of or under your document. Free and private.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Overlay PDF
- Select your document and then the overlay PDF.
- Choose on top or underneath and how overlay pages repeat.
- Download the combined PDF.
Overlay places one PDF on top of another – for example your company letterhead behind a letter exported without it, or an "APPROVED" stamp over every page. It keeps everything as vectors for sharp printing.
Common uses
- Add a company letterhead to letters and invoices.
- Place a pre-printed form background under filled-in data.
- Stamp "Approved" or "Copy" on documents.
Tips for best results
- Use "underneath" for letterheads and "on top" for stamps.
- Make sure both PDFs use the same page size (A4 or Letter).
Letterheads made easy
Keep your letterhead as a one-page PDF and overlay it onto any document exported from Word, Google Docs or accounting software. Every page gets the same professional branding without editing templates.
Why use Fileopia for Overlay 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
Overlay 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
Can I use one letterhead page for all pages?
Yes – choose 'First page only on all pages'.
Can I use one letterhead for all pages?
Yes – choose 'First page only on all pages'.
Is Overlay 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.