Why the work happens in your browser
Most online utilities POST your input to a backend, which means an API key, a customer record or a production log line leaves your control the moment you click convert. CruxDev tools are plain JavaScript running in the page you already loaded, so the data never crosses the network. You can verify it: open your browser devtools, watch the Network tab, and use any tool on this site.
Browse by category
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Daily Life Tools
— 13 tools
Everyday calculators and converters for the whole world - health, money, kitchen, time, and random picks. All offline.
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AI & LLM Tools
— 10 tools
AI-era utilities: token and cost estimators, prompt tooling, secret scanners, and schema generators - all fully in-browser.
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Text Tools
— 39 tools
Analyze, format, clean, and convert text formats instantly.
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Developer Tools
— 92 tools
Format, validate, parse, and hash code structures in-browser.
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CSS Generators
— 36 tools
Visually build, customize, and copy responsive CSS stylings.
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UI Components
— 9 tools
Copy-ready UI components for every platform: Flutter, Jetpack Compose, SwiftUI, React Native, React, Vue, Tailwind & HTML/CSS.
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Color Tools
— 7 tools
Convert hex/rgb values, generate harmonic palettes, and simulate.
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Security Tools
— 19 tools
Generate cryptographically secure passwords and strength metrics.
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Unit Converters
— 5 tools
Convert metric, imperial, temperature, and storage parameters.
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Finance & Math
— 17 tools
Calculate percentage matrices, loan EMIs, and bio indices.
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Image Tools
— 12 tools
Compress, resize, crop, watermark, and inspect images entirely in your browser.
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File Converters
— 9 tools
Convert images and extract text from PDFs securely offline.
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Productivity
— 19 tools
Protect focus, build habits, and keep useful work local to your browser.
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Network & Web Tools
— 14 tools
IP converters, subnet calculators, MAC generators, port tools, URL parsers, and web header builders — all offline.
No account, no upload limit, no paywall
There is nothing to sign up for. Because each tool is client-side, the size of the file you process is limited by your own memory rather than by an upload quota, and the tools keep working after you go offline.