Some free PDF tools stamp a giant logo on your output. It is the cheapest growth trick and the rudest. Here is the list of tools that don't.
All five tested. All clean on free output.
Flint
No watermark on any tier, including free. Caps on volume rather than branding. Edit-pdf, sign-pdf, merge-pdf all clean.
Sejda
Explicit no-watermark guarantee. Three tasks per hour on free.
Smallpdf
No watermark. Two tasks per day on free.
iLovePDF
No watermark. Caps on certain tools at the free tier.
PDF24
No watermark. Free with display ads instead.
Best for…
All five are honest on this. Pick by cap shape, not by watermark fear.
FAQ
Which tools do watermark?
Mostly the no-name 'free PDF editor' sites that turn up in ads. Stick to the names above.
Can I remove a watermark from another tool's output?
Sometimes, with redact-pdf on Flint — but it is faster to redo the job in a tool that doesn't watermark in the first place.
What if a tool says 'remove watermark'?
That usually means a paid upsell. Pick a tool that does not watermark to start with.
Skip the tools that stamp your output. Flint and the others above are honest about it.