How to Compress an Audio File for Email
Updated October 2026
Email services limit attachment size. A voice clip becomes small quickly if you use mono, a moderate bit rate and no dead air at the start and end.
The short version
- Convert to mono; a single voice does not need two channels.
- Use a moderate bit rate for speech.
- Trim the silence at the start and end.
- Check the size limit of the service before you send.
Check the limit first
Each email service has an attachment size limit. Check it before you start, so you know how much to reduce.
Mono and trim
Convert to mono and trim the dead air. These two steps often halve the size without changing how a voice sounds. The trimming guide shows how.
Export a compressed copy
Export a compressed format from the master at a moderate bit rate. Listen to the copy before you send it. For speech, a moderate setting is usually clear.
Share a link if it is still large
For a long file, a file-sharing link often works better than an attachment. Check the sharing terms and who can open the link.
Small copy, same voice
Tunedzy exports a mono or compressed copy from the master, and keeps the full file for editing.
Free tools for this
Frequently asked questions
Will the email copy sound worse?
At a moderate bit rate, speech is usually clear. Listen before you send.
Which format is smallest?
A compressed format at a moderate bit rate. WAV is the largest.
Should I keep the original?
Yes. Send the copy and keep the master.
Keep going
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