Practical focus
Use this page when an audio attachment is too large for email and needs a safer sending size.
Private browser-based audio compression
Compress Audio for Email
Compress audio for email attachments with 10MB, 20MB, and 24MB targets that leave room for provider overhead.
Your audio is compressed locally in your browser. Files are not uploaded to a server.
MP3 / WAV / M4A / AAC / OGG / FLAC inputMP3M4A / AACOGG
File-
Size-
Duration-
Your audio is compressed locally in your browser. Files are not uploaded to a server.
Compression mode
Quick targets
Advanced settings
Select an audio file to begin.
Compression result
Original size-
Compressed size-
Saved-
Output-
Bitrate-
Quick tips
- Target 24MB, not 25MB, for a 25MB email limit.
- Convert WAV to MP3 or AAC.
- Use a cloud link if compression would damage the audio too much.
How to use
- Choose 10MB for conservative attachments, 20MB for a larger but still safer file, or 24MB for a 25MB-style limit.
- Use MP3 output when the recipient may use unknown software.
- Convert WAV recordings to MP3/AAC before attaching.
- If the email still fails, use a file link rather than repeatedly lowering bitrate.
Recommended settings
| Email need | Suggested setting |
|---|---|
| Safe small attachment | Target 10MB |
| Larger attachment | Target 20MB |
| 25MB provider limit | Target 24MB |
| WAV source | Convert to MP3/AAC |
| Voice recording | MP3, 96 kbps mono |
Supported formats
MP3 is the safest email attachment format.
AAC/M4A can work well, but MP3 is easier for unknown recipients.
Quality vs file size
Email limits are not only about the local file size. Providers may add transfer overhead or count attachments differently.
A WAV file can usually shrink a lot after MP3/AAC conversion; an already-compressed MP3 may require bitrate reduction.
Privacy and local processing
Compression runs in your browser, so the original audio is not uploaded to a server.
Large files can still be slow because decoding and encoding use your device memory and CPU.
Things to watch
- Do not aim exactly at a provider limit.
- Cloud storage is better for long or high-quality audio that should not be heavily compressed.
FAQ
What size is safe for email audio attachments?
10MB is conservative; 20MB is often practical; 24MB is safer than 25MB for many provider limits.
Why should I target 24MB instead of 25MB?
Email systems may add overhead or round sizes, causing a 25MB file to fail.
Can I email WAV files?
You can, but WAV files are often too large. Convert to MP3 or AAC first.
What format is best for email audio?
MP3 is the safest choice for broad compatibility.
What if the email still fails to send?
Use a smaller target or share a cloud link.