Free Online Calculators & Converters
Free, fast, privacy-friendly calculators and converters — image format conversion, unit converters, astrology calculators, and more, all running in your browser.
More tools coming soon.
Who We Are
Zolvo is built and maintained by a small, independent team of developers and designers who enjoy turning everyday questions — "how many kilograms is that?", "what's my moon sign?", "can I convert this RAW photo to JPG?" — into simple, free tools that just work.
Our Mission
We believe useful tools shouldn't require an account, a subscription, or your personal data. Every calculator and converter on Zolvo is designed to be fast, free, and available to anyone, anywhere — without barriers.