How does it handle cem, cento and the e connector?

It uses standard Portuguese rules — 100 alone is cem, 101–199 begin with cento e, and e joins hundreds, tens and the final group (cento e vinte e três, mil e duzentos). It uses Brazilian short scale (milhão, bilhão).

Is the result safe to use on documents?

The spelling follows standard Portuguese por-extenso conventions, but always proofread the words against the figure before using them on a cheque, contract or official form.

Are my numbers transmitted anywhere?

No. The conversion runs entirely in your browser with JavaScript. Nothing you type is sent, logged or stored on any server.

Number to Words in Portuguese (Números por Extenso)

Number to words in Portuguese — números por extenso

Type a number and get its Portuguese word form (números por extenso) instantly.

The converter applies the rules people get wrong: cem when 100 stands alone but cento e … from 101, the e connector that links hundreds, tens and the final group (cento e vinte e três, mil e duzentos), the irregular hundreds (quinhentos, novecentos …), invariable mil, and the milhão / milhões and bilhão / bilhões plurals (Brazilian short scale).

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