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: Depends on your plan and format. 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:
Having trouble with a specific format? Send us a message and we can help.