Dialer or Dialler: The American and British Spellings and Which One to Use

Dialer or dialler difference

Dialer and dialler differ by one letter and by nothing else. The difference comes from a general rule rather than from telephones: when a word ends in a single vowel followed by l, British English doubles the l before a suffix such as -ed, -ing or -er, and American English usually does not. So British writers have dialled, dialling and dialler, as they have travelled and cancelled; American writers have dialed, dialing and dialer, as they have traveled and canceled. Neither spelling is a mistake. Wiktionary, for example, lists dialler simply as an "alternative form of dialer". When Google's autocomplete was checked on 4 October 2026, it offered both "dialer or dialler" and "dialler or dialer", which shows people in several countries asking the same question. The Auto Dialer writes dialer in its name and product, and British spelling elsewhere on this site.

Dialer or dialler word forms

Dialer or dialler meaning

Whichever way it is spelled, a dialler is something that dials telephone numbers. On a phone it is the keypad app or a click to call link; in a sales office it is software that calls a list, from the simplest one-at-a-time outbound dialer to predictive systems in large centres that rely on answering machine detection. The vocabulary that goes with it, such as auto dial, redial and call disposition, is gathered on the auto dialing terms page, and the different kinds of system are compared under types of dialers. Even the naming inside the family trips people up; auto dialer vs power dialer untangles two labels that are often used as if they were one.

Dialer or dialler for your writing

• Dialer. Best for: US readers, software interfaces, and anything quoting a product name spelled that way.
• Dialler. Best for: documents for the UK, Ireland, Australia or New Zealand that follow British spelling throughout.
• Either, applied consistently. Best for: Indian and other Commonwealth English, where formal writing tends to follow British rules but much software uses the American form.

The one firm rule is consistency inside a document, with names left exactly as their owners spell them. A British contract can speak of "the dialler" and still name The Auto Dialer with one l.

Dialer or dialler in search

People search with both spellings, and autocomplete offers each as a suggestion for the other, so writers do not need to repeat both forms everywhere. Write for the reader in front of you, and mention the other spelling once where it helps someone who typed it to recognise the page. Telephony terms with deeper differences than spelling, such as internet calling versus SIM calling, are explained under auto dialer VoIP.

Dialer or dialler example

A made-up example with round numbers, to show the choice in practice.

A recruiter in Leeds writes a 300-word advert for a telesales role. She uses British spelling throughout, so the duties read "making about 60 calls a day on an auto dialler" and "logging numbers dialled". In the skills list she adds "experience with dialer software" once, because applicants trained on American-built tools search that way, and she keeps the employer's software name exactly as written.

Dialer or dialler limits

Spelling changes nothing about what a dialer is allowed to do. A dialler used in the United Kingdom is still bound by PECR and the Telephone Preference Service, as set out under auto dialer rules in the UK; an American-spelled dialer calling British numbers is bound by exactly the same rules.