Audio Bitrate Converter
Change an audio file's bitrate to shrink it — or raise it for a lossless source — with the real size difference reported.
Convert with this tool
or choose a file from your device — it is processed in this tab and never uploaded
Accepted: MP3, M4A/AAC, OGG, Opus, FLAC, WAV
Files stay on your device. There is no upload, no queue and no watermark, so a conversion works even with the network switched off after the page has loaded.
Supported formats & processing
| Accepted input | MP3, M4A/AAC, OGG, Opus, FLAC, WAV |
|---|---|
| Produced output | MP3 at 64, 96, 128, 192, 256 or 320 kbps; or WAV / FLAC |
| Processing | Web Audio API + canvas + native JavaScript encoders |
| Upload required | No — the file is read locally and never transmitted |
How to use this tool
- Add the file and note its current bitrateThe result card reports the declared bitrate from the source header.
- Choose the new bitrate96 kbps for speech, 128 kbps for casual music, 192 kbps as a safe general default.
- Keep the sample rateRe-sampling as well as re-encoding compounds the loss; change one variable at a time.
- Convert and compare sizesThe old and new byte counts are shown side by side.
- Download, or try another valueReset and run again if the saving is not large enough.
About this tool
Bitrate is the number of bits the encoder is allowed to spend per second of audio. Lowering it makes the file smaller and, past a certain point, audibly worse. Raising it makes the file larger and, unless the source is lossless, adds nothing.
The usual reason to be here is space: a podcast library or an audiobook collection at 192 kbps can drop to 96 kbps and halve in size with little perceptible cost for speech. The result card reports both the source size and the new size so the saving is visible before you download.
Features
- Six standard bitrate steps from 64 to 320 kbps
- Source size, output size and the percentage change all reported
- Declared bitrate from the codec header shown alongside the measured one
- No forced re-sampling, so only one lossy pass is applied
- Works on MP3, AAC, Vorbis, Opus, FLAC and WAV inputs
- Guidance on the point where speech starts to sound metallic
Frequently asked questions
What is a good bitrate for podcasts?
96 kbps mono or 128 kbps stereo is transparent for speech in almost every case. Audiobooks at 64 kbps mono are common and perfectly listenable.
Does lowering the bitrate twice degrade the audio twice?
Yes. Each lossy encode applies its own quantisation, and the errors accumulate. Go from the best available source straight to the final bitrate in one step.
Why is the measured bitrate different from the declared one?
Variable-bitrate files report a nominal average in the header while the real file size depends on the actual content. Both figures are shown in the result card.
Can I raise the bitrate to fix a bad recording?
No. Encoding at a higher rate cannot recreate information that was already discarded. Use the volume changer or the audio compressor to make a quiet or uneven recording easier to listen to instead.