Frequently Asked Questions

Everything you need to know about CuroPDF. Can't find your answer? Contact us.

Is CuroPDF really free? No trial, no subscription?

Yes — completely free. All 44 tools, no limits, no credit card, no trial, no subscription. We are currently bootstrapped and building our user base. If we ever add paid features, they will be enterprise extras (API access, batch processing, team features) — not limits on the free tools you use today. We promise at least 60 days' notice before any pricing change.

How do I know my files aren't being uploaded?

All work happens locally using PDF-lib.js running in your browser tab via WebAssembly. You can verify this yourself:

  1. Open your browser's Developer Tools (F12)
  2. Go to the Network tab
  3. Process a PDF with any tool
  4. Watch for zero outbound file requests while processing

Only the HTML page and JavaScript library are loaded from our server. Your PDF data never leaves your device.

Does CuroPDF work on iPhone and Android?

Yes. CuroPDF works on Safari (iOS 14+), Chrome, Firefox, and Edge on Android. The upload zone is fully tappable — no tiny button to find. Drawing signatures with your finger works well on touchscreens. For best performance on mobile, we recommend keeping files under 50MB on older devices due to browser memory constraints.

Are there file size limits?

No hard limits imposed by us. Files under 200MB work reliably on all modern devices. Very large files (300MB+) may be slow on older phones or tablets due to browser memory constraints. Since processing happens locally, your device's RAM is the only limiting factor.

How does CuroPDF make money if everything is free?

Right now, we don't. CuroPDF is bootstrapped by the founding team. Our plan is to build a large, happy user base first, then introduce optional paid features for businesses: API access, batch processing via command line, team collaboration features, and priority support. The core 44 tools will always remain free and unlimited.

Is there a desktop app?

CuroPDF works as a Progressive Web App (PWA). You can "install" it to your desktop or home screen directly from your browser — no download from an app store required. On Chrome, click the install icon in the address bar. On Safari (iOS), tap Share → Add to Home Screen. Once installed, it works offline for many tools.

Can I use CuroPDF for commercial purposes?

Absolutely. You may use CuroPDF for personal, academic, and commercial purposes without restriction. Process client contracts, invoices, legal documents, or marketing materials — no license required. Just don't use it for illegal activities (removing security from PDFs you don't own, distributing malware, etc.).

What happens if I lose my internet connection while processing?

Once the page and PDF-lib.js are loaded, most tools continue to work offline. You can process files without an internet connection. You only need connectivity to initially load the website. We recommend installing the PWA for full offline capability.

Do you add watermarks to output files?

Never. Unlike competitors who watermark free-plan output, CuroPDF outputs are completely clean. The only watermark you'll see is one you choose to add yourself using our Watermark tool.

Is my data sold to advertisers?

No. We do not collect personal data, browsing history, or PDF content. There is nothing to sell. We don't use Google Analytics, Facebook pixels, or any third-party tracking. Our only "analytics" are anonymous tool-usage counters (e.g., "Merge PDF was used 500 times today") with no user-identifiable information.

How do I report a bug or request a feature?

We love feedback! Use our contact form, email hello@curopdf.com, or open an issue on our GitHub. We read every message and typically respond within 24 hours.