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Stamp a text watermark — DRAFT, CONFIDENTIAL, your brand name — diagonally across every page of a PDF. The mark is merged into each page itself, so it survives printing, screenshotting and re-sharing.
On ConvertFormat the matrix is the interface: the Add Watermark to PDF is organised by the format you have and the format you need, because "change the format" is the whole job description — pick the pair, convert once, from the best original you have.
100% freeNo sign-upNo watermarkFiles auto-deletedWorks on any device
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Tap to choose a file or drag & drop it here
PDF files · deleted right after processing
A short ad is shown before processing — it keeps this tool free. No sign-up, no watermark.
Upload your file — drag & drop it or tap to browse.
Set any options, then hit the button.
Watch the short ad — your finished file downloads instantly.
Why people pick this over other converters
No account, ever. Most big converter sites push sign-ups and paid tiers for basic jobs. Here the tool just works.
No watermarks and no job counters on standard tools — fair-use rate limits keep things fast for everyone — and a generous 200 MB upload limit.
Private by design: your file is processed in a temporary folder and deleted the moment your download finishes. Nothing is stored or shared.
Fast: this page is a fraction of the size of the ad-heavy alternatives, and the same account-free toolbox has 386 other tools when you need them.
FAQ
Can the watermark be removed later?
It is merged into the page content, so casual removal tools will not lift it cleanly. Keep an unwatermarked master copy — this tool works on the file you upload and returns a new one.
Is this really free?
Yes — completely. A short ad before processing keeps every tool free; no account, subscription or credits are ever required.
What happens to my file?
It is processed in a temporary folder and deleted the moment your download finishes. We never store, view or share uploads.
Do I need to install anything?
No. Everything runs in your browser session against our servers — any phone, tablet or computer works.
