Zentools
Free · Private · No sign-up

Everyday tools, done right.

Convert currencies, run EMI numbers, resize a photo, or generate a strong password — all in one clean toolkit that runs entirely in your browser. Nothing you type is ever uploaded.

Browse all tools Try currency converter
100% client-side No installs Free forever
Currency Exchange
1,000
USD ▾
1,32,450
NPR ▾
1 USD = 132.45 NPR Updated moments ago
Private by design Everything runs in your browser. No accounts, no tracking of your inputs.
Fast, no clutter Every tool loads instantly and does one job well.
Works offline Once loaded, most tools keep working without a connection.
15+ tools, one place No need to bookmark a dozen different single-purpose sites.
Popular tools

Start with what you need today

The rest of the toolkit is one tap away from every page.

Currency Exchange

Live rates, currency swapping, favorites, and smart number formatting.

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Financial Calculator

EMI, loan, compound interest, GST/VAT, BMI, age, and date-difference.

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Unit Converter

Length, weight, area, and more — including regional land units.

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Text Tools

Word/character counters, case converter, dedupe, and an offline notepad.

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Password Generator

Strong, customizable passwords with entropy scoring and passphrases.

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Image Optimizer

Compress, resize, crop, and convert images — entirely on your device.

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Why choose us

Built to be trusted, not just used

Genuinely fast

Lightweight pages with no unnecessary scripts, so tools respond instantly.

Accurate results

Formulas match industry-standard financial and conversion methods.

Accessible to everyone

Full keyboard support and screen-reader labeling across every tool.

Always free

No paywalls, tiers, or feature limits hiding behind a subscription.

Works on any device

Every layout is mobile-first and tested down to small phone screens.

Constantly improving

New tools and refinements ship regularly based on what people need.

Privacy & security

Your data never leaves your device

Every calculator, converter, and the image optimizer run using client-side JavaScript only. There's no upload, no server-side storage, and no account required.

  • No files or numbers are ever transmitted to a server
  • No account, email, or personal information required
  • Local storage is used only for preferences you choose to save
  • Served over HTTPS with no third-party data resale
FAQ

Good to know

Short answers to the questions people ask before their first calculation.

No. Every calculator, converter, and the image optimizer run entirely in your browser using JavaScript. Nothing you type or upload is sent to a server.

No sign-up is required for any tool. A few tools use local storage on your device to remember preferences, like favorite currencies.

Yes — every page is built mobile-first and tested down to small phone screens, with tap-friendly controls throughout.

Rates refresh from a live exchange-rate source, with a cached fallback so the tool still works if you're briefly offline.

Pick a tool and get your answer in seconds.

No installs, no accounts, no waiting.

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