Audio and Video Formats for Transcription
Learn which audio and video formats VoxScriber supports, including all 516 codecs and 422 formats, and see how to get your files transcribed.
VoxScriber supports virtually all existing audio and video formats. Find out which format offers the best quality for your transcriptions.
Numbers
| Statistic | Quantity |
|---|---|
| Supported Codecs | 516 |
| File Formats | 422 |
| Audio Codecs | 280+ |
| Video Codecs | 236+ |
Recommended Formats
These are the formats we support best for transcription quality:
Audio
MP3
Popular | Recommended
The most universal compressed audio format. Excellent compatibility with all devices and platforms. Great balance between quality and file size.
WAV
Recommended | Uncompressed audio
Maximum lossless audio quality. Ideal for professional recordings where transcription accuracy is critical. Larger files, but better fidelity.
M4A / AAC
Popular | Apple format
Standard format for Apple devices (iPhone, iPad). Good compression with quality superior to MP3 at the same bitrate.
FLAC
Lossless audio
Lossless compression. Ideal for high-fidelity files. Smaller size than WAV with the same quality.
OGG / OGA
Open format
Open-source format. Common in web applications and Linux. Good quality at low bitrates.
WMA
Windows format
Microsoft proprietary format. Common in recordings made on Windows. Compatible with Windows Media Player.
Video
For video files, we automatically extract the audio track for transcription:
MP4
Popular | Recommended
Most universal video format. Compatible with virtually all devices and platforms.
MOV
Popular | Apple format
Standard format for Apple cameras and devices. High audio and video quality.
AVI
Classic format
Classic Windows video format. Widely compatible, but files can be large.
MKV
Matroska format
Versatile container that supports multiple audio tracks and subtitles. Common in high-quality content.
WebM
Web format
Web-optimized format developed by Google. Common in online videos and streaming.
WMV
Windows format
Microsoft proprietary video format. Common in Windows corporate environments.
Other Supported Formats
In addition to the popular formats listed above, VoxScriber supports hundreds of other formats including:
Additional Audio
AIFF, AMR, APE, AU, CAF, DTS, GSM, OPUS, RA, SPX, TTA, VOC, WV, and many others.
Additional Video
3GP, ASF, FLV, M2TS, MTS, MPEG, MPG, OGV, RM, SWF, TS, VOB, and many others.
Professional Formats
BWF (Broadcast Wave Format), RF64, W64, CAF (Core Audio Format), and other formats used in professional audio production.
For best transcription quality, prefer uncompressed formats (WAV, FLAC) or high-quality compression (MP3 320kbps, AAC 256kbps). Highly compressed formats can reduce transcription accuracy.
Tips for Better Quality
Recording
- Use a quality microphone when possible
- Record in a quiet environment
- Keep a consistent distance from the microphone
- Avoid overlapping voices
File Format
- Prefer WAV or FLAC for maximum quality
- MP3 at 128kbps or higher is suitable for most cases
- Avoid highly compressed formats (low bitrate)
- For video, MP4 with AAC audio is ideal
Upload
- Check the file size before uploading
- Files up to 5GB are supported with AssemblyAI
- For very large files, consider splitting them into parts
- Use a stable connection for large uploads
All Audio Formats
Click on any format to see technical details, advantages, and how to transcribe:
MP3 | WAV | OPUS | AMR | AIFF | ALAC | APE | AU | CAF | DTS | AC3 | GSM | MP2 | RealAudio | VOC | WavPack | QCP | Speex | G.722 | M4A | FLAC | AAC | OGG | WMA | TTA | Musepack | Shorten
All Video Formats
For videos, we extract the audio track automatically:
MP4 | MKV | MOV | AVI | WMV | FLV | WebM | TS | MPEG | VOB | RMVB | 3GP | MXF | DV | OGV | M2TS | ASF | M2V | DAT | DivX | Xvid
Ready to transcribe?
Now that you know all supported formats, upload your file and try the quality of our automatic transcription.
Keep learning
- Accepted Formats and Upload Limits by Plan - Complete analysis with pros, cons, and technical recommendations
- Which Transcription Engine to Choose - How to optimize your files for better transcription
- Large File Uploads - Complete file upload guide