Best Free Currency Converter Online
Currency converters live and die by rate freshness. A converter that uses yesterday's rates is fine for rough estimates; for business or travel decisions, real-time or same-day rates matter.
Top options compared
| Tool | Rate source | Update frequency | Offline | Privacy |
|---|---|---|---|---|
| Irreva | Open exchange rates API | Daily | ⌠(needs API call) | No storage |
| XE.com | Interbank / commercial | Live | ⌠| Account optional |
| Google Currency | Google Finance | Near-live | ⌠| Google tracking |
| Wise | Mid-market rate | Live | ⌠| Account for transfers |
| OANDA | OANDA proprietary | Live | ⌠| Account |
Rate types explained
The mid-market rate (interbank rate) is what you see on Google. Banks and exchange services add a margin on top — the 'spread.' For actual transactions, compare the effective rate including fees, not just the displayed rate.
When to use which
- Quick estimate for travel budget → Google Currency or Irreva
- Business invoice amounts → XE.com or OANDA for live rates
- International money transfer → Wise shows the all-in cost
- Historical rates for accounting → OANDA historical converter
Frequently Asked Questions
Are Irreva currency rates accurate?
Rates update daily from an open exchange rates provider. For rough estimates they are accurate; for live trading or wire transfers, use a real-time source.
How many currencies does Irreva support?
150+ currencies including all major and most minor currencies.