Speak AI reads most common audio and video formats, plus documents and images. If your file is on this list, drag it in and it transcribes and analyzes like any other upload.
Supported formats
Audio
- MP3, the most common audio format
- WAV, uncompressed audio and the highest quality
- M4A, Apple audio
- M4P, protected Apple audio
- AAC, Advanced Audio Coding
- FLAC, lossless compressed audio
- OGG, open-source audio
- WEBM, web audio
- AMR, the format most phone voice recorders produce
Video
- MP4, the most common video format
- MOV, Apple QuickTime video
- M4V, Apple video
- AVI, Windows video
- WMV, Windows Media Video
- FLV, Flash video
Documents, images, and links
- Documents: TXT, DOCX, and PDF for text-based analysis
- Images: PNG and JPEG, read with OCR
- URLs: YouTube and Vimeo links, and direct media links
Spreadsheets take a different route. To analyze a CSV, use CSV import, which turns each row into its own file or note.
File limits
- Duration: up to 10 hours per file. See Duration limits.
- File size: on the free plan, each file can be up to 2GB. Paid plans upload larger files. Compressed formats such as MP3 and M4A fit longer recordings inside the same size limit.
- PDFs: 50MB per file, whatever your plan.
- Links: 200MB per import, so a long video usually uploads faster as a file than as a URL.
Get the best transcription
- MP3 at 128kbps suits most recordings: a small file with good speech clarity.
- WAV gives the highest accuracy but the files are much larger.
- If a file is too large, compress the audio bitrate. 64kbps still transcribes speech well.
- For video, Speak AI extracts the audio track automatically. Video quality does not affect transcription accuracy.
Convert an unsupported file
MKV and WMA are the two formats people most often expect to find on the list above. Neither one gets past the file picker, so convert those before you upload.
Convert to MP3 for audio or MP4 for video with a free tool:
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