Watermark PDF
Watermark PDF files online for free. Stamp confidential text or logos on every page in your browser — private, no upload.
- Free
- No Signup
- No Daily Limit
- Browser-Based
- No Server Upload
- Fast Processing
- Works on Mobile
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4.7/52,337 votes
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How to watermark a PDF with text or logo
Upload a PDF, add text or image watermarks, adjust opacity and placement, then apply to every page. Download the stamped document instantly.
Searching watermark pdf, stamp pdf, or add logo to pdf? This tool runs fully client-side.
Why choose SnapKit? Our tools are 100% Private, No Server Upload, Instant Browser-Based, with No File Size Limit.
When should you use this tool?
Watermark PDF files online for free. Stamp confidential text or logos on every page in your browser — private, no upload.
Is my data uploaded to the server?
No. SnapKit processes your files entirely in your browser using client-side WebAssembly, Canvas, and Web APIs. Your documents, images, and audio never leave your device, and we do not store uploads on our servers.
Why choose SnapKit?
Every tool is built around four promises: privacy, speed, freedom, and accessibility. No cloud pipeline — just your browser and your files.
100% Private — No Server Upload
Files are processed on your device with client-side WebAssembly and Canvas. No bytes are sent to our servers.
Instant Browser-Based speed
Skip slow uploads and downloads. Your CPU and GPU do the work locally for near-instant results.
No File Size Limit — Free forever
No registration walls, no watermarks, and no arbitrary caps. Use ringtone, video, PDF, and image tools freely.
Works on every device
iPhone, Android, Windows, and Mac browsers are all supported with the same private, instant experience.
Frequently asked questions
Can I watermark every page of a PDF?
Yes. Watermarks can be applied across all pages in one action.
Can I use both text and image watermarks?
Yes. Combine confidential text with a logo stamp when needed.
Is watermark pdf free?
Yes. Watermarking is free with no watermark on the tool itself.
Is my data safe with this tool?
Yes. All processing runs 100% on your device using client-side WebAssembly, Canvas API, and browser APIs. No bytes from your files are transmitted to our servers — zero server upload, absolute privacy.
Why is the processing speed so fast?
Because your file never leaves your browser. SnapKit uses WebAssembly and Canvas to harness your device CPU and GPU directly, skipping slow network upload and download steps.