SonaFactEvidence from audio
SonaFactEvidence from audio

Check the length of audio files

Choose one file or a whole batch and see how long each one is — and how many minutes they add up to. Handy before ordering a transcription or planning your work.

Your files never leave your device: their length is read right here, in your browser — nothing is uploaded.

or drop it here

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SonaFact's free plan takes 3 transcripts a day, up to 30 minutes each, with no card. Paid plans start at 20 hours of recordings a month.

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How to do it

  1. Choose or drop audio and video files — as many as you need.
  2. Wait a moment while the length of each file is read.
  3. Read the total in hours, minutes and seconds; add more files whenever you like.

Questions

Which files can it measure?
MP3, M4A, WAV, OGG, OPUS, FLAC, AMR, WebM and videos such as MP4 and MOV — whatever your browser can read. A file it can't read is marked in the list and left out of the total.
How is the total rounded?
The total is shown in hours, minutes and seconds, and in whole minutes rounded up.
How many files can I add?
Up to 500 at once. Files are measured one by one, and you can keep adding more to the same list.

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