Supported formats and file limits

Audio formats

MP3, WAV, M4A, AAC, OGG, FLAC, and most other common audio formats.

Video formats

MP4, MOV, WebM, MKV, AVI, and most other common video formats. FileToText reads the audio track inside the video; you do not need to extract it first.

File limits

• Length: up to 20 hours per file. However long the recording, one upload comes back as one uninterrupted transcript; you never split or stitch anything yourself.
• Size: up to 20 GB per file when uploaded from your device.

Uploading multiple files at once

Drop or select up to 10 files in one go and each one becomes its own transcript. Handy for an interview study or a batch of episodes: queue them all, come back when they are done. Every file in the batch keeps the normal limits (20 GB, 20 hours) and its own free first 10 minutes.

Other ways to get audio in

• Paste a link to a media file and we fetch it directly.
• Record in the browser: the microphone recorder on the homepage captures audio and sends it straight to transcription.

Languages

90+ languages, detected automatically. A Portuguese podcast or a Korean lecture needs no configuration, and mixed-language collections do not require you to set the language per file.

Not sure your file will work?

Just try it: with a free account (no credit card), the first 10 minutes of any file transcribe free, so an unusual format or difficult recording costs you nothing to test. And if a paid transcript disappoints, we refund it, no questions asked.