BYTETOOLS

Audio Bitrate Changer

Change audio bitrate online for free. Re-encode MP3, M4A or OGG to an exact CBR or VBR bitrate — like MP3 at 128 kbps — in your browser, nothing uploaded.

Drop an audio file here or click to browseYour audio is re-encoded locally and never uploaded.

What is the Audio Bitrate Changer?

The ByteTools Audio Bitrate Changer re-encodes an audio file to the exact bitrate you choose — constant bitrate (CBR) from 64 to 320 kbps, or variable bitrate (VBR) quality levels for MP3 and OGG.

  • CBR from 64 to 320 kbps, in standard steps
  • True VBR modes for MP3 (V0–V9) and OGG Vorbis (q0–q8)
  • MP3, M4A/AAC and OGG output formats
  • Shows the output size next to the original
  • 100% local — audio is never uploaded
  • Free, unlimited and works offline once loaded

How to use the Audio Bitrate Changer

  1. 1

    Drop an audio file onto the box or click to browse for one.

  2. 2

    Choose the output format (MP3, M4A/AAC or OGG) and CBR or VBR mode.

  3. 3

    Pick the target bitrate or VBR quality level.

  4. 4

    Click Change Bitrate, preview the result and check the new size.

  5. 5

    Download the re-encoded file.

About the Audio Bitrate Changer

The ByteTools Audio Bitrate Changer re-encodes an audio file to the exact bitrate you choose — constant bitrate (CBR) from 64 to 320 kbps, or variable bitrate (VBR) quality levels for MP3 and OGG. Pick the output format, pick the rate, convert, and compare the new file size instantly.

It exists for every requirement that names a number: an upload form that demands "MP3, max 128 kbps", a podcast host with bitrate rules, an MP3 player with limited storage, or an audiobook library you want at 64 kbps mono territory. Where our audio compressor just makes files smaller, this tool hits a specific target.

Everything runs 100% locally in your browser using a WebAssembly build of ffmpeg. Your audio is never uploaded — no server, no account — and the tool keeps working offline once the engine has loaded.

Frequently asked questions

Does lowering the bitrate reduce audio quality?

Yes — a lower bitrate keeps less detail, which is how the file gets smaller. 128 kbps MP3 is acceptable for casual listening and speech, while 192–256 kbps keeps music sounding clean. Pick the lowest rate that still meets your needs.

Does increasing the bitrate improve quality?

No. Re-encoding a 128 kbps file at 320 kbps produces a bigger file with the same (or very slightly worse) sound, because the detail was already discarded. Higher bitrates only help when encoding from a better source.

What is the difference between CBR and VBR?

CBR spends the same bits on every second, giving predictable file sizes — what strict upload requirements usually mean. VBR varies the rate with the music's complexity, delivering better quality per megabyte when only the ballpark size matters.

What bitrate should I use for an MP3?

192 kbps CBR or V2 VBR is transparent to most listeners for music. Use 128 kbps when a form demands it or storage is tight, 96–112 kbps for podcasts and speech, and 320 kbps only when a spec explicitly requires it.

Is my audio uploaded to a server?

No. The re-encode runs entirely in your browser using WebAssembly, so your file is processed on your own device and never sent anywhere.

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