MP3 vs WAV for Transcription
WAV can preserve more audio detail, while MP3 is smaller and easier to move. The better choice depends on how the recording was created and what quality is available.
When WAV helps
A clean uncompressed WAV avoids losses introduced by compression. That can help with quiet speakers, technical vocabulary and recordings that will be edited later.
When MP3 is enough
A well-recorded MP3 at a sensible bitrate is often excellent for meetings, interviews and podcasts. Microphone placement usually matters more than the extension.
Avoid unnecessary conversion
Converting MP3 to WAV does not restore missing detail. It only makes the file larger. Upload the best original version you already have.
Practical recommendation
Record in a high-quality format when you control the microphone. If you receive an MP3, transcribe it directly and focus on reviewing names, numbers and noisy sections.