How are soixante-dix and quatre-vingts handled?

The converter uses metropolitan French rules — 70 is soixante-dix (60 + 10..19), 80 is quatre-vingts with the plural -s only when it ends the number, and 81–99 are quatre-vingt-… with no -s and no et.

Can I trust the spelling for official use?

It follows standard French number-spelling rules including the cent/cents plural and invariable mille, but always proofread the words against the figure before using them on a cheque or official document.

Is anything sent to a server?

No. All conversion happens locally in your browser. The numbers you enter are never uploaded, logged or stored anywhere.

Number to Words in French (Nombres en Lettres)

Number to words in French — nombres en lettres

Type a number and get its French word form (nombres en lettres) instantly.

French numbering has famous quirks and this converter handles them: 70 = soixante-dix, 80 = quatre-vingts (with the plural -s only when it ends the number — quatre-vingts but quatre-vingt-un), the et un / et onze joins (vingt et un, soixante et onze), the cent / cents plural (deux cents but deux cent un), and invariable mille.

All processing is 100% client-side — your numbers never leave your browser.