How I Built a Suite of 15 Zero-Server, 100% Client‑Side Calculators & Tools

Description and use

Kitzura is a set of 15 free web tools that run entirely in the browser, ensuring privacy, instant performance, and zero server costs.

Problem

Users need quick online tools but face paywalls, privacy risks, and slow frameworks.

Outcome

Kitzura delivers 70‑85% image size reduction, instant password entropy feedback, and lightweight PDF export without server costs.

Workflow

• 1. Adopt a zero‑backend architecture.
• 2. Host static assets on Firebase CDN.
• 3. Implement image compression with HTMLCanvasElement.toBlob().
• 4. Generate passwords using Web Crypto API.
• 5. Create PDFs with native CSS @media print rules.
• 6. Deploy and iterate on performance.
• 7. Publish suite to public URL.

Evidence

Everything must run inside the user's browser.

Source

70% to 85% file size reductions right on the client device, keeping bandwidth zero and execution instantaneous.

Source

By computing Shannon entropy directly in real-time, users get instant feedback on password crack-time projections against standard GPU clusters.

Source