You merged two PDFs on a free site and discovered, after sending to your client, that every page now carries a faint diagonal 'TRY PREMIUM' stamp. Now you're explaining it on a call you didn't want to have.
Flint doesn't do that. There's no watermark on the output, ever, regardless of plan.
Why other tools watermark free merges
It's a conversion tactic — make the free version unusable for real work so you upgrade. The trouble is, users find out only after sending. The damage is done. We took a different position: free should produce a real, usable file. We build a business on people who like the tool enough to come back for harder things.
What the output actually looks like
Drop your PDFs into merge PDF, click merge, download. Open the result in any reader. Look at any page. No banner, no diagonal text, no footer plug. It's exactly what you'd get from combining the files in Acrobat — a clean merged PDF.
Free includes what you need
Merge, split, rotate, reorder, delete pages, compress, convert to Word, convert to JPG. All without watermarks. Paid tiers exist for higher volumes and team features, not to ungate basic functionality.
Check before you send
If you've been burned by watermarks before, open the merged file before sending and zoom out to see the full page. No watermark? Send it. (We promise there won't be one.)
FAQ
Are there hidden watermarks?
No. No visible, invisible, faint, or 'promotional' marks. The PDF is yours, full stop.
Does Flint add anything to PDF metadata?
The PDF producer field reflects the toolchain (this is standard for any PDF). No personal data, no marketing.
What if I need it for commercial use?
Use it commercially. Flint outputs are yours to use however you want.
Is there a file count limit on free?
No artificial limit on merge files. Browser memory is the practical ceiling.
Unwatermarked, free, in your browser. Merge PDFs cleanly.