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Currency converter

Convert any amount between 200+ currencies using daily exchange rates. Your amounts stay on your device, only public rate data is fetched, and the last rates are cached for offline use.

How Currency converter works

Currency converter turns an amount from one currency into another using daily exchange rates sourced from the fawazahmed0/exchange-api project, served as static files over the jsDelivr CDN. Pick two currencies from the 200+ available, type an amount, and the result appears in under a second. The only network request is for that public rate table - the amounts you type and the currencies you choose are never transmitted anywhere. Rates are cached locally after the first fetch, so the tool keeps working offline from the last snapshot.

These are once-a-day reference rates, not a live trading feed. Every result is labelled with the rate date so you know exactly how fresh it is. Cryptocurrency assets are included for rough reference, but a daily rate is not reliable for trading decisions. There is no sign-up, no markup on the published rate and no fee added on this end.

Written by Bastien Sulyan

How to use Currency converter, step by step

  1. Select the source currency in the From field.
  2. Select the target currency in the To field.
  3. Type an amount and read the converted result plus the rate date.
  4. Swap the two currencies with the arrow button to reverse the conversion.
  5. Use the result offline - the latest rates stay cached on your device until the next update.

Common use cases

  • A traveller checks how much a hotel quoted in Thai baht costs in euros before booking.
  • A freelancer invoiced in USD converts the amount to GBP to know what will arrive in their bank account.
  • An importer compares product costs in CNY against a JPY alternative using the same day's reference rates.
  • A student checks the rough EUR equivalent of a course fee quoted in CAD while researching universities abroad.

Frequently asked questions

Are the amounts I type sent anywhere when I convert currencies?

No. The conversion calculation runs entirely in your browser. The only outbound request is to fetch the public daily rate table from the jsDelivr CDN - that file is the same for every visitor worldwide. The number you enter, the currencies you pick and the result are never transmitted to Sunasty or any third party.

How often are the exchange rates updated?

Once per day. The rate date is displayed alongside every result so you can see exactly when it was last refreshed. After the first successful fetch the rates are cached in your browser's localStorage, so conversions still work offline using that snapshot until the next update.

Where do the exchange rates actually come from?

From the free, key-less fawazahmed0/exchange-api project, which aggregates daily reference rates from public sources and distributes them as static JSON files via jsDelivr, with a Cloudflare Pages endpoint as a fallback. The project publishes a daily reference table without documenting which sources it aggregates or which market price they stand for, so read the numbers as an indication: close enough to compare prices, not the rate your bank, card issuer or broker will apply.

Can I rely on the crypto rates shown here for a trade or investment?

No. Cryptocurrency prices move every minute, sometimes every second. A once-a-day snapshot gives only a rough order of magnitude and is not suitable for any trading, tax or investment decision. Use a live exchange or a dedicated crypto data provider for those purposes.

Does the converter work if I lose my internet connection mid-session?

Yes, provided the rate table was fetched at least once. The last downloaded rates remain in localStorage and all conversions continue to work offline. The rate date shown tells you when those cached rates were retrieved.

How does the tool calculate cross-currency rates like JPY to BRL?

All rates in the dataset are expressed relative to a single base currency (EUR). To convert JPY to BRL the tool divides the JPY rate by the BRL rate, giving an accurate cross-rate without any extra markup.

Can I convert currencies on my phone while travelling?

Yes, and that is one of the more common real uses of this tool. The page is a plain web form, so it works in any mobile browser, and once the daily rate table has loaded once you can keep converting even with spotty hotel Wi-Fi or airplane mode, from the last cached snapshot.

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