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.

What is the difference between cem and cento?

cem is used for exactly 100 on its own, while cento is used inside 101-199 — so 100 is cem but 123 is cento e vinte e três.

Does it use Brazilian or European Portuguese scale words?

It uses the Brazilian short scale, where milhão is a million and bilhão a thousand million. The hundreds, tens and connector rules are shared with European Portuguese.

How are the irregular hundreds spelled?

Several hundreds are irregular: 500 is quinhentos, 700 is setecentos and 900 is novecentos, rather than following the cinco/sete/nove pattern. The converter applies these forms automatically.

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)

This tool spells any number into its Portuguese word form (números por extenso) — useful for cheques, contracts and learning. It applies the rules people most often get wrong, and runs entirely in your browser.

How it works

The converter spells each three-digit group and applies standard Portuguese conventions:

cem for exactly 100, but cento e … from 101 (cento e um).
The connector e links hundreds, tens and the final group — cento e vinte e três, mil e duzentos.
The irregular hundreds quinhentos (500), setecentos (700) and novecentos (900).
Invariable mil, and the milhão / milhões and bilhão / bilhões plurals (Brazilian short scale).

Example

Number	Portuguese
100	cem
123	cento e vinte e três
500	quinhentos
1,200	mil e duzentos
1,000,000	um milhão

So 1234 spells out as mil duzentos e trinta e quatro.

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