Fact · Dictation on Windows
Microsoft says the Transcribe feature in Word currently supports .wav, .mp4, .m4a and .mp3 audio files for upload.
Checked against its source on October 16, 2026
In the source's own words
“Transcribe currently supports .wav, .mp4, .m4a, .mp3 formats.”
Transcribe your recordings (Word for Microsoft 365), Microsoft Support, n.d., Upload an audio file.
Open the original- What it measures
- Microsoft's steps for uploading a pre-recorded file to Word's Transcribe pane, under Home, Dictate, Transcribe.
- What it does not show
- The list is what Microsoft gives today. It describes the upload feature in Word, not Copilot Chat.
Source
Cited on
- Dictate in Word: Voice Typing on Web, Windows and MacGuide
- Voice Memo to Text: Built-In and Free OptionsGuide
- Can Copilot transcribe audio to text?Question
- Can Google Docs transcribe an audio file?Question
- Can Microsoft Word transcribe an audio file?Question
- Can Microsoft Word transcribe audio files?Question
- How do you transcribe a QuickTime audio or screen recording?Question
- What is the difference between Dictate and Transcribe in Word?Question
- Transcribe (Microsoft 365)Glossary