Compress MP3 to 5MB
Compress a MP3 file to about 5MB. Lowers the bitrate to hit your target, dropping to mono and a narrower band only if the target needs it.
Up to 50 MB per file. Sign up free to compress files up to 100 MB.
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Checking files and selected compression settings.
This page stops at 50 MB and one file per run. Pro compresses files up to 1 GB and a full batch in one go, with a priority queue.
What reaching 5 MB costs an MP3
Set 5 MB as the target and the engine works down to it in steps, stopping at the first result that fits rather than padding the file back out.
Size is bitrate times duration, so the bitrate is worked out from your target and the length of the recording rather than searched for. Stereo is kept while the budget allows it; mono and a narrower band are used only once nothing else reaches the target.
Files are processed on our servers, not in your browser. The upload and the result are both permanently deleted within 1 hour, no backups and no copies kept.
No watermark, and no account needed to use it. 5 files a day at up to 50 MB each, sent singly or together; signing in is free and raises each file to 100 MB.
Reaching 5 MB without over-compressing
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1
Let the encoder stop early
If your recording reaches a transparent bitrate well under the cap, it is left there. A four minute track that sounds finished at 192 kbps has no reason to be pushed up to fill the space.
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2
Keep stereo
At this target there is no pressure to fold channels together. Width, reverb and anything panned across the image survive, which is the main thing tighter caps cost you.
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3
Check the length against the cap
Five megabytes is generous for a song and tight for a lecture. Twenty minutes of audio has about 35 kbps to spend here, which is speech-only territory.
The size a song can afford to be
Five megabytes is the first target on this list where a piece of music does not have to give anything up. A three-minute track lands at roughly 233 kbps, above the rate at which most listeners stop being able to pick the compressed version in a blind comparison. At 128 kbps the same budget runs for five and a half minutes, which covers most singles and a good many album tracks.
The forms that stop at 5 MB
Unlike 1 and 2 MB, this one is frequently an external requirement. Submission forms for competitions and auditions, learning platforms taking a spoken assignment, and job applications accepting an audio sample all cluster around five megabytes.
That matters because a form with a 5 MB ceiling usually wants music or a prepared reading, which is exactly the material this target handles without audible compromise.
Where 5 MB stops being enough
Length is the limit, not quality. Anything past about six minutes starts trading away bitrate to fit, and past twenty minutes the result is intelligible speech rather than music. Recordings that long belong at 10 MB.
Frequently asked questions
Will a song compressed to 5 MB sound noticeably worse?
For a track of ordinary length, no. Three minutes at 5 MB works out near 233 kbps, and above roughly 192 kbps most people cannot pick the compressed file out in a fair comparison. Longer tracks get less per second and the margin narrows.
How much audio fits in 5 MB?
About five and a half minutes at 128 kbps, or ten minutes at 64 kbps if the material is a single voice. Music and speech give very different answers because they need very different rates.
Should I use this for a podcast episode?
Only a short one. A half-hour episode has about 23 kbps to spend at this cap, which is thin even for speech. Use 10 MB for full episodes and keep 5 MB for music and shorter pieces.