Change Audio Bitrate and Format
Re-encode audio at a lower bitrate to shrink it, or step up to a cleaner format. Pick the target, download — all in your browser.
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This tool changes an audio file's bitrate and format — the direct fix for files that are too large. Re-encode a 320 kbps MP3 at 128 kbps and watch the file shrink to less than half; or move to a different codec entirely.
The re-encode runs in your browser. You see the target settings before you commit, and the original file stays untouched on your device.
Why Use This Adjust Audio Quality Tool?
- Bitrate control — 320, 256, 192, 128 or 96 kbps
- Format switching — MP3, AAC, OGG (Opus) and more, feature-detected
- Predictable results — the settings you pick are exactly what is applied
- Private — re-encoded in your browser, nothing uploaded
- Free, no signup
How to Change Audio Quality — 3 Steps
- Drop your audio file into the box above and wait for the file details to appear.
- Pick the output format and bitrate — lower bitrate means a smaller file.
- Press the blue Convert button and download the re-encoded file.
Bitrate, Size and the Art of Shrinking Audio
Audio file size is almost entirely a function of bitrate: a 3-minute song at 320 kbps is roughly 7 MB; the same song at 128 kbps is about 2.8 MB. When a platform rejects a file for size or a mailbox chokes on an attachment, lowering the bitrate is the correct fix — the trick is choosing the lowest value that still sounds right for the material. Speech survives 96 kbps happily; full-bandwidth music wants 192 kbps or more to stay convincing.
Re-encoding is not free quality, and honesty matters here: every lossy-to-lossy conversion adds a little generational softness. Going from 320 to 192 kbps is generally imperceptible; going from 128 to 96 compounds what was already lost. The rule: re-encode from the highest-quality source you have, and never treat a low-bitrate file as an archive — keep the original.
Format switching is the other half of this tool. MP3 to AAC (.m4a) often buys smaller files at the same quality because AAC is a more efficient codec. MP3 to OGG (Opus) buys even more. Going the other way — Opus to MP3 — buys compatibility. The format list is checked against your browser at load time; MP3 encoding falls back to a built-in encoder so MP3 output works everywhere.
As with every tool on this site, the decode and re-encode happen on your device. There is no upload of the source file, no server queue, and no copy of your audio left behind anywhere.
Frequently Asked Questions
192 kbps for music you listen to, 128 kbps as a safe floor for most listeners, 96 kbps for speech, 320 kbps for archival-sounding output. Lower is smaller; test one file before batch thinking.
If the source was already heavily compressed (a 96 kbps MP3), re-encoding lower saves little and costs quality. Files with headroom — 320 kbps sources, WAV, FLAC — shrink the most.
Lossy-to-lossy conversion adds a small generational loss. At moderate steps (320 to 192) it is not audible; at extreme steps it is. Keep the original file as your master.
No — a higher bitrate cannot restore detail that is already gone. Re-encode up only to change format, not to improve sound.
MP3, WAV, FLAC, AAC (.m4a) and OGG (Opus) — the page checks your browser and lists only what it can genuinely encode.
No — the re-encode runs in your browser and the download comes from your device.