Unit Converter-Free & Easy

ConvertMaster is a completely free, ad-free unit converter.
Launch and go. No sign-up. No data collection.
All 40 categories are permanently free. No paywalls.

ALL FEATURES FREE FOREVER:
• 40 categories — currency, length, weight, area, volume, temperature, speed, time, pressure, energy, power, data storage, cooking, angle, fuel, force, torque and more
• 200+ currencies with live exchange rates, updated hourly
• Currency picker with search — find any currency instantly
• Multilingual currency names (CLDR standard)
• Home page ranks categories by your usage frequency
• Restores your last-used category on launch
• Batch convert — enter multiple values, see all results instantly
• CSV export for batch results
• Metric and imperial side by side
• Scientific notation for extreme values
• Dark mode
• 100% offline (except live currency rates)

No account. No sign-up. No data collection.
No internet required (except live rates).

Most converters limit their currency list or lock categories behind paywalls.
ConvertMaster gives you everything — 200+ currencies with search, 40 categories — all for free, forever.

Voluntary support available in app — optional, never nagged.

No data collected. No tracking. No sharing.
Your numbers, on your device only.