Phrase guide

file extension

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

A short series of text characters at the end of a computer filename, used to indicate the type of contents and the software that will be required to operate or open it.

Definition source: English Wiktionary via Wiktextract

Examples

  • A text file may have a file extension of .txt.

Meaning relationships

Synonyms: filename extension, extension

Antonyms: none provided

Broader terms: extension

History

Etymology

No etymology was provided for this word.

Across languages

Translations

34 source translations are retained for this English entry.

  • Chinese Cantonese: 副檔名 /副档名 (fu3 dong2 ming4) — string of characters
  • Chinese Mandarin: 擴展名 /扩展名 (kuòzhǎnmíng) — string of characters
  • Chinese Mandarin: 文件擴展名 /文件扩展名 (wénjiàn kuòzhǎnmíng) — string of characters
  • Chinese Mandarin: 副檔名 /副档名 (fùdǎngmíng, fùdàngmíng) — string of characters
  • Chinese Mandarin: 延伸檔名 /延伸档名 (yánshēn dǎngmíng, yánshēn dàngmíng) — string of characters
  • Chinese Mandarin: 後綴名 /后缀名 (hòuzhuìmíng) — string of characters
  • Czech: koncovka souboru — string of characters
  • Czech: přípona souboru — string of characters
  • Danish: filtype — string of characters
  • Danish: filendelse — string of characters
  • Dutch: bestandsextensie — string of characters
  • Finnish: tiedostopääte — string of characters
  • French: extension de fichier — string of characters
  • German: Dateiendung — string of characters
  • Greek: επέκταση ονόματος αρχείου (epéktasi onómatos archeíou) — string of characters
  • Greek: επέκταση αρχείου (epéktasi archeíou) — string of characters
  • Hungarian: fájlkiterjesztés — string of characters
  • Icelandic: nafnauki — string of characters
  • Italian: estensione di nome di schedario — string of characters
  • Japanese: 拡張子 — string of characters
  • Kazakh: файл атауының кеңейтімі (fail atauynyñ keñeitımı) — string of characters
  • Korean: 확장자 (hwakjangja) — string of characters
  • Korean: 확장명 (hwakjangmyeong) — string of characters
  • Norwegian Bokmål: filetternavn — string of characters
  • Norwegian Bokmål: filendelse — string of characters
  • Norwegian Bokmål: filnavnsuffiks — string of characters
  • Norwegian Nynorsk: filetternavn — string of characters
  • Norwegian Nynorsk: filending — string of characters
  • Norwegian Nynorsk: filnavnsuffiks — string of characters
  • Polish: rozszerzenie nazwy pliku — string of characters
  • Portuguese: extensão — string of characters
  • Russian: дополне́ние к файлу (dopolnénije k fajlu) — string of characters
  • Spanish: extensión de archivo — string of characters
  • Swedish: filändelse — string of characters