Supported formats
Speak AI supports most common audio and video formats:
Audio
- MP3 - Most common audio format
- WAV - Uncompressed audio (highest quality)
- M4A - Apple audio format
- FLAC - Lossless compressed audio
- OGG - Open-source audio format
- WMA - Windows Media Audio
- AAC - Advanced Audio Coding
- WEBM - Web audio format
Video
- MP4 - Most common video format
- MOV - Apple QuickTime video
- AVI - Windows video format
- MKV - Matroska video
- WEBM - Web video format
- WMV - Windows Media Video
Other
- Text files (TXT, CSV) - For text-based analysis
- URLs - YouTube links, direct media URLs
File limits
- Maximum duration: Up to 4 hours per file
- File size: On the free plan, each file can be up to 2GB. Paid plans can upload larger files. Compressed formats (MP3, M4A) allow longer recordings within size limits.
Tips for best results
- MP3 at 128kbps is the sweet spot for most recordings: small file size with good speech clarity
- WAV files give the highest transcription accuracy but are much larger
- If your file is too large, compress the audio bitrate (64kbps still works well for speech)
- For video, Speak extracts the audio track automatically. Video quality doesn’t affect transcription accuracy.
Converting files
If your file is in an unsupported format, you can convert it using free tools:
- HandBrake for video conversion
- Audacity for audio conversion
- Online converters like CloudConvert or Zamzar
Having trouble with a specific format? Send us a message and we can help.
Supported audio and video file formats
Supported formats
Speak AI supports most common audio and video formats:
Audio
- MP3 - Most common audio format
- WAV - Uncompressed audio (highest quality)
- M4A - Apple audio format
- FLAC - Lossless compressed audio
- OGG - Open-source audio format
- WMA - Windows Media Audio
- AAC - Advanced Audio Coding
- WEBM - Web audio format
Video
- MP4 - Most common video format
- MOV - Apple QuickTime video
- AVI - Windows video format
- MKV - Matroska video
- WEBM - Web video format
- WMV - Windows Media Video
Other
- Text files (TXT, CSV) - For text-based analysis
- URLs - YouTube links, direct media URLs
File limits
- Maximum duration: Up to 4 hours per file
- File size: On the free plan, each file can be up to 2GB. Paid plans can upload larger files. Compressed formats (MP3, M4A) allow longer recordings within size limits.
Tips for best results
- MP3 at 128kbps is the sweet spot for most recordings: small file size with good speech clarity
- WAV files give the highest transcription accuracy but are much larger
- If your file is too large, compress the audio bitrate (64kbps still works well for speech)
- For video, Speak extracts the audio track automatically. Video quality doesn’t affect transcription accuracy.
Converting files
If your file is in an unsupported format, you can convert it using free tools:
- HandBrake for video conversion
- Audacity for audio conversion
- Online converters like CloudConvert or Zamzar
Having trouble with a specific format? Send us a message and we can help.
Evaluating Speak AI for a team? Book a demo and see your own recordings analyzed.
Related: Uploads · CSV import