Audio Bitrate Converter: Bitrate, Sample Rate & Mono
An audio bitrate converter for when the specs matter: set the exact bitrate (32 to 320 kbps, CBR or VBR), the sample rate, stereo or mono, and the bit depth for WAV and FLAC, and edit or remove the title, artist and album tags in the same pass. It re-encodes MP3, M4A, WAV, FLAC, OGG and Opus in your browser, with no upload.
- Runs on your device
- WebCodecs · GPU
- FFmpeg
- Works offline
Updated
Drop your videos or audio files here
How to change the bitrate of an audio file
Step 1: Drop your audio files on the box above.
Step 2: Choose the Format, then the Bitrate and Bitrate mode (CBR or VBR).
Step 3: Set Sample rate and Channels; under Advanced settings, type new tags or tick Remove all tags.
Step 4: Press Encode and download the files.
Good to know
Settings explained
- Bitrate mode
- MP3 VBR uses the FFmpeg engine (≈31 MB, downloaded once); the other formats encode VBR natively.
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
- FFmpeg (when needed)
- Older formats and a few filters use FFmpeg compiled to WebAssembly. It downloads once (about 31 MB) the first time it is needed and is cached for offline use.
CBR or VBR: which should you use?
Use CBR (constant bitrate) when a device, a phone system or a streaming spec asks for a fixed rate, or when you need predictable sizes. Use VBR (variable bitrate) for music you listen to: it spends more bits on busy passages and fewer on quiet ones, so you get better quality per megabyte.
| Bitrate setting | LAME VBR level | Typical use |
|---|---|---|
| 256 or 320 kbps | V0 | Highest-quality VBR |
| 192 kbps | V2 | Transparent for most music |
| 128 kbps | V4 | Everyday listening |
| 96 kbps | V6 | Speech, podcasts |
| 64 kbps | V8 | Low-bandwidth speech |
| 32 or 48 kbps | V9 | Smallest possible |
Does converting a 128 kbps MP3 to 320 kbps improve quality?
No. Bitrate is how much data the encoder may use, not how much detail exists. A 128 kbps MP3 re-encoded at 320 kbps keeps the 128 kbps sound and is two and a half times bigger. Raising the bitrate only helps when you re-encode from a lossless source. Lowering it is the useful direction: a 320 kbps file re-encoded at 128 kbps is 60% smaller and still fine for speech or casual listening.
Audio sample rate converter, stereo to mono and bit depth
- Sample rate: 22.05, 32, 44.1 or 48 kHz. Use 44.1 kHz for CDs and music players, 48 kHz for video. Lowering it shrinks lossless files; MP3 limits the bitrate to 160 kbps at 22.05 kHz.
- Stereo to mono: both channels are mixed into one. Mono halves the size of WAV and FLAC and lets lossy formats sound better at low bitrates; at the same bitrate an MP3 stays the same size.
- Bit depth (WAV and FLAC): 16-bit for playback and CDs, 24-bit for further editing.
Edit MP3 tags online
This page doubles as a simple MP3 tag editor online. Open Advanced settings and type a new Title, Artist or Album; empty fields keep the original tag. Tick Remove all tags to strip every tag, which is handy before you share a recording that carries an old name. Tags are written into the re-encoded file, so this tag editor always produces a new encode; for a lossless result, choose WAV or FLAC.
Tips & troubleshooting
Only want a smaller file? The audio compressor has just the size settings and a size estimate.
Converting format rather than fine-tuning? The audio converter is simpler.
Check a file’s current bitrate and sample rate first with media info.
Audio Encoder (Advanced) FAQ
How do I change the bitrate of an MP3?
To change MP3 bitrate, drop the MP3 here, keep Format on MP3, choose the new Bitrate and press Encode. Lowering the bitrate makes the file smaller; raising it never adds quality.
How do I convert stereo to mono?
Set Channels to Mono and press Encode. The left and right channels are mixed into one, which is ideal for speech and phone systems.
How do I change the sample rate of an audio file?
Choose a Sample rate of 22.05, 32, 44.1 or 48 kHz and press Encode. The audio is resampled with a high-quality filter. Opus files are always 48 kHz by design.
Can I edit MP3 tags without changing the audio?
Not on this page: tags are written as part of a new encode. Pick WAV or FLAC if you need a lossless copy, or a bitrate at or above the original for MP3.