MP3 compression

Lighter files
Same track

Choose the bitrate, or state the size you need and let the bitrate follow. Either way the file stays an MP3 and plays wherever it played before.

Three ways to ask

One setting applies to the whole batch
Pick a quality256 / 128 / 64 KBPS

High holds up on real speakers. Medium is the standard streaming rate. Low is for speech, where nobody is listening for cymbals.

Pick a percentageSHARE OF SOURCE

Say you want forty percent of the current size and the bitrate is derived from the running time of the track.

Pick a sizeEXACT MB

Give the figure the upload form or the mailbox insists on, and the encode is planned to land under it.

What each rate is for

Bitrate is the budget the encoder spends per second of audio. Spend less and the quiet detail goes first.

256 kbps

Music you will actually sit and listen to. Roughly a fifth off a typical source file, with nothing obvious given up.

128 kbps

Background listening, podcasts with music beds, anything going out over a phone connection. The common middle ground.

64 kbps

Voice recordings and archives. Small enough to attach to almost anything, still perfectly intelligible.

Speech survives the low end

Interviews, lectures and voice notes stay clear at 64 kbps, where music would start to sound thin. Match the rate to the material.

No pointless re-encodes

If a file is already below the rate you asked for, it comes back as it was rather than being run through the encoder twice.

Ten tracks a batch

Queue up to 10 files of 25 MB each and apply one setting across the lot.

Erased after the job

Audio is processed and then removed. Nothing is fingerprinted, matched against a catalog or kept on disk.

Longer recordings and a bigger monthly allowance come with a plan. Look at the terms →