Don's Tools · Converters

Converters

A free set of converters that run in your browser. Units, currency, timezones, number bases and CSV or JSON.

Converters is a free collection of conversion tools on Don's Tools. They run in your browser and include a unit converter for length, weight, temperature and more, a currency converter covering over 160 currencies with daily rates, a timezone converter for comparing times across cities, a number base converter for binary, octal, decimal and hexadecimal, and a CSV to JSON and JSON to CSV converter. The unit, base, timezone and CSV tools work fully offline; the currency converter fetches only public exchange rates.
Unit Converter›Currency Converter›Timezone Converter›Base Converter›CSV to JSON & JSON to CSV›

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Frequently asked questions

Are these converters free and private?

Yes. Every converter is free with no sign-up, and they run in your browser. The unit, base, timezone and CSV tools work fully offline with nothing uploaded; the currency converter fetches public exchange rates from the internet but sends nothing about you.

Do I need to install anything?

No. They work in any modern browser on phone, tablet or computer, with no download, plugin or account.

Which converters are here?

A unit converter, a currency converter, a timezone converter, a number base converter and a CSV to JSON and JSON to CSV converter, with more added over time.

Does the currency converter use live rates?

It uses public daily reference exchange rates, which are ideal for everyday estimates but are not live trading rates, so the amount a bank gives you may differ.

Is my data safe?

For the offline tools your data never leaves your device. For the currency converter only the exchange rates are downloaded; your amounts are calculated locally and are never sent anywhere.