About Dueneo

Our promises

• Useful. Each page solves a real user problem immediately — no fluff, no detours.
• Private. All tools are designed to process inputs locally in your browser. Files and form data are not uploaded for tool processing.
• Fast. Pages are statically delivered, mobile-first, and designed to work without unnecessary network round trips.

What Dueneo offers

Dueneo provides over 240 browser-based tools across 16 categories: image editing, PDF manipulation, developer utilities, text processing, business document generation, financial calculators, design helpers, SEO analysis, and more. There are also 15 lightweight classic games you can play instantly. Every tool runs entirely in your browser — no file uploads, no accounts, no server-side processing.

How we test changes

Before publishing, we validate every catalogue entry and route, run TypeScript and production-build checks, and manually test key journeys at desktop and mobile widths. If you find a result that looks wrong, include the tool URL and your inputs in a bug report when those inputs are safe to share.

How we make money

Dueneo is supported by simple, non-obstructive ads. The page must remain useful even if ads fail to load. We never place ads near copy/download/play buttons, never use popups, and never use forced interstitials. Sensitive tools (like the password generator or JWT decoder) show fewer ads by default.

How the site is built

Dueneo is built with modern web technologies and served as static pages for fast loading worldwide. All tool logic runs client-side using browser APIs like Canvas, Web Crypto, and File System Access. The site is open about its architecture: your data stays on your device because the code literally cannot send it elsewhere.

Get in touch

Spotted a bug or have a tool suggestion? Head to our contact page.