Watermark PDF. Protect Your Hard Work from Content Thieves.
Standard Anti-Theft Watermark: add it instantly, 100% free. Enterprise-Grade Dynamic Watermark Grid (Pro): built for high-stakes bidding documents, legal contracts, and sensitive drafts — un-erasable digital security meshes that lock down your IP.
The text will appear diagonally across every page in light gray.
Drag & drop PDF to add watermark
Stamp confidential text diagonally across all pages.
Why We Reject the "$0.99 Bait-and-Switch" Business Model
You know the drill: a "$0.99 trial" that quietly auto-renews at $49.99 after 3 days, with cancellation buttons buried in 7 submenus. The big PDF players have been running this playbook for over a decade, treating users like walking credit cards. We think that's disgusting. PDFSail handles everyday tasks — compression, merging, splitting, annotations — 100% locally in your browser via WebAssembly. These tools remain FREE because they cost us virtually nothing in server overhead.
Heavy-lifting features — high-fidelity PDF-to-Office conversion, batch parallel processing, super-large file orchestration — do require expensive cloud engines. To reject venture capital, reject selling user data, and reject surveillance capitalism, we charge a tiny Pro fee for these enterprise-grade operations. No sneaky trials. No auto-renewal. No B.S.
Thank you for supporting independent developers. Your Pro upgrade directly funds the servers that make batch processing, OCR, and premium format conversion possible. Together, we're proving that you can build a sustainable business without screwing people over.
The PDF Tool That Doesn't Screw You Over.
Tired of those "$0.99 trials" that silently drain $49.99 from your card 3 days later? So were we. That's why we built PDFSail: everyday PDF tasks run 100% locally in your browser for FREE. No credit card. No sign-up. No hidden catches. Upgrade to Pro only when you need heavy-lifting enterprise workflows — and even then, ABSOLUTELY NO AUTO-RENEWAL.