logo

Make your audio files smaller, in your browser

Shrink a 60 MB voice memo into something you can email, or batch-compress a whole folder of podcast clips down to a target bitrate. Pick the quality, see the projected size before you commit, and let the encoder run on your own machine.

Drag & drop files here

Or click to browse (max 20 files, up to 300 MB each)

File upload

Runs in your browser · See output sizes before you compress · Up to 20 files at once

Why use this audio compressor?

Pick the size with one click

Four bitrate presets cover the practical range — Light (192 kbps), Standard (128 kbps), Strong (96 kbps), Extreme (64 kbps). Each one tells you what it's good for, and the file list updates the projected output size as soon as you switch presets, so 'fits in this email' becomes a one-click decision.

See the size before you commit

Every file in the queue shows its original size next to a live estimate of what the output will weigh at the current preset, with the savings as a percentage. No more compress-and-hope — you know up front whether 96 kbps gets you under your 25 MB attachment limit.

Twenty files in one pass

Drop in twenty voice memos, podcast cuts or lecture recordings and they all get the same preset in a single queue. Most online compressors handle one file at a time; this one runs the whole batch and hands you a ZIP at the end.

Voice mode for tiny files

A 'Force mono' toggle concentrates the bits on a single channel — perfect for spoken-word content at low bitrates. Combined with the Extreme preset, an hour of voice fits inside 30 MB without the muddiness that low-bitrate stereo brings.

Works on the formats you actually have

MP3, WAV, M4A, AAC, FLAC, OGG and OPUS are all accepted on the way in. Output is always MP3 — the format that plays everywhere and gets the smallest sizes for the widest range of inputs.

Nothing leaves your browser

Encoding runs locally with ffmpeg compiled to WebAssembly. Your audio isn't uploaded, copied to a server, or stored anywhere we can see — even sensitive recordings like interviews and voice memos stay on your device.

Why people compress audio files

A voice memo too big to email

You walked the dog and recorded a thirty-minute brainstorm to your phone. Back home, you try to email the M4A to a colleague and Gmail rejects it — the file is 47 MB and the limit is 25. You don't want to set up a Drive share for a single voice note, and you definitely don't want to lose the recording to a 'send via cloud' workflow you'll forget to clean up later.

You drop the file onto the page. The original sits at 47 MB; the Standard preset shows the projected output at around 13 MB. You hit Compress & download. Eight seconds later the MP3 is in your downloads folder, you attach it to the email, and it goes through on the first try. Your colleague gets the brainstorm before lunch.

The recording is the same story it was. It's just smaller now.

A backlog of podcast clips before the upload deadline

You produce a weekly podcast and the host wants twenty short audio clips for social media by tonight. Your editor exports them at 320 kbps for archival, which is great for the master folder and terrible for a CMS that caps uploads at 10 MB per asset. Twenty re-exports through your DAW would mean another hour you don't have.

You drop all twenty MP3s into the page. The list shows each one at 8 to 14 MB; the Strong preset (96 kbps) brings every projected output under 4 MB without obviously losing voice clarity. You hit Compress & download, walk away, and come back to a queue that's done. Download all as ZIP, drag into the CMS, every file uploads first time.

That's the difference between submitting tonight and submitting tomorrow.

Field recordings for a Dropbox folder that's too full

You're a journalist on a long reporting trip and your phone keeps beeping at you about Dropbox storage. The trip recordings are FLACs because you wanted high quality at capture time, and they've added up to 12 GB across the project folder. You're not ready to delete anything — the interviews are still being transcribed — but you can't fit another week of recordings without paying for more storage you don't really need.

You drop a folder of FLACs into the page in batches of twenty. Standard preset, mono on (every file is a single mic anyway). The original sizes are 80 to 200 MB each; the projected outputs are all under 15 MB. By the end of the afternoon, the project folder is down to 1.4 GB and Dropbox stops complaining. The originals still live on your laptop's local drive — what's in the cloud is the working copy.

The trip continues, the storage warning is gone, and you didn't pay for a tier you didn't really need.

1

Drop in your audio

Pick one or more audio files, or drag a folder onto the page. MP3, WAV, M4A, AAC, FLAC, OGG and OPUS are all welcome — up to twenty files at a time.

2

Pick a quality preset

Choose Light, Standard, Strong or Extreme. Every file in the list shows its projected output size and the percentage saved, so you can pick the preset that lands you under your target.

3

Compress and download

Hit Compress & download. Files process one after another. Save each one as it finishes, or grab the whole batch as a ZIP at the end.

  • Your audio never leaves your browser, so there's nothing on our side to delete.
  • All compression runs locally on your device. We don't see, store, or transmit your audio.
  • No sign-up, no email, no limits. Drop in your audio and shrink it.