A meeting or interview WAV may exceed an attachment cap. An MP3 listening copy can help, while a recording still being edited needs a retained master.
Choose a bitrate with the attachment budget in mind, audition the parts that matter for speech or music, and check the actual file before sending.
Start with these choices
Finish edits in WAV and use MP3 as the listening copy.
Longer recordings need more bytes at the same bitrate.
Include quiet speech or dense music when checking the export.
Keep an editing master and make a listening copy
A recorder or audio editor may produce a large WAV even for an ordinary meeting. If the recipient only needs to listen, send an MP3 copy while retaining the WAV in your project folder.
Keep the WAV when cuts, mixing or another export are still planned. Making MP3 and later converting it back to WAV cannot undo the first lossy conversion. Name the listening copy separately so it does not become the source for the next edit.
Estimate the attachment size before choosing a bitrate
For a fixed bitrate, estimated audio payload in decimal MB is bitrate in kbps × seconds ÷ 8 ÷ 1000. A 20-minute MP3 is roughly 19.2MB at 128kbps or 28.8MB at 192kbps. These are calculations, not measured exports; tags and container overhead can change the saved size.
If an email only accepts 20MB, choosing 192kbps will not solve that example. Consider a lower bitrate after listening, a shorter recording or an approved sharing link. Treat the recipient’s exact limit as authoritative and leave some margin.
Audition speech and music differently
For a spoken memo, compare a passage with quiet speech, consonants and room noise. For music, include cymbals, sustained notes and a dense passage rather than checking only a silent introduction.
Use 128kbps for speech or 192kbps for music as trial settings, not quality guarantees. Listen at a similar volume on the device the recipient will use. Raise the setting only when the difference matters for the purpose.
A noisy recording needs more than a format change
Hiss, clipping and distant speech belong to the recording. Exporting a larger MP3 does not remove them. Return to the recording setup or a suitable audio editor when intelligibility is the problem.
A low-bitrate MP3 does not replace a clean WAV archive. If the recording matters, retain the original even when the smaller sharing copy sounds acceptable.
Open the attachment you are actually going to send
Check the beginning, a passage in the middle and the ending in the saved MP3. Confirm that the whole intended recording is present, then check its exact bytes and attach that copy rather than the WAV by mistake.
Keep a clear association between the original and the sharing copy, for example a common recording name with an “MP3-share” suffix. For confidential material, also review the recipient list and sharing permissions.