# Convert a Voice Note
Convert WhatsApp, Telegram, Signal and other Opus/Ogg voice notes to MP3 or WAV, or encode audio back to Opus voice notes in your browser.
## Run it
- **CLI:** `gizza tool voice-note-converter 'url=https://example.com/input' 'format=opus' 'mono=true'`
- **Web:** https://gizza.ai/tools/voice-note-converter/
- **Agents:** machine-readable descriptor (parameters JSON Schema) at https://gizza.ai/tools/voice-note-converter/tool.json
## Inputs
- `audio` — Audio or voice note _(file; accept: audio/*)_
- `format` — Target format _(field)_
- `bitrate` — Bitrate (kbps, lossy only) _(field)_
- `mono` — Mono / voice-tuned _(field)_
## Output
- Converted voice note (audio)
## Query parameters
Open the tool pre-filled and auto-run via URL:
- `format` — Target format
- `bitrate` — Bitrate (kbps, lossy only)
- `mono` — Mono / voice-tuned
- `url` — fetch the input file from a public URL (CORS-permitting)
Example: `https://gizza.ai/tools/voice-note-converter/?url=https://example.com/input&format=opus&mono=true`
---
## About this tool
Voice Note Converter handles the audio format most chat apps use for recorded messages: Opus audio in an Ogg container, usually saved as `.opus` or `.ogg`. Drop in a WhatsApp, Telegram, Signal or browser-recorded voice note and convert it to **MP3** for broad playback or **WAV** for editing. You can also go the other way: upload an MP3/WAV clip and create a compact `.opus` voice note tuned for speech.
Everything runs through ffmpeg in your browser. The audio file stays local to your device; it is not uploaded to gizza.
## Worked examples
- **Voice note to MP3:** choose a `.opus` or `.ogg` voice message, set **Target format** to `MP3`, leave **Mono / voice-tuned** on, and use `128` kbps.
- **MP3 back to a chat-style voice note:** choose an `.mp3`, set **Target format** to `Opus voice note (.opus)`, use `24` or `32` kbps, and keep mono on.
- **Editing workflow:** convert a voice note to `WAV`, edit it in an audio editor, then convert the edited result back to `Opus`.
CLI example:
```bash
gizza tool voice-note-converter url=https://example.com/voice.ogg format=mp3 bitrate=128 mono=true --out voice.mp3
```
## Options and limits
| Option | What it does |
| --- | --- |
| **Target format** | `opus` creates an Ogg/Opus voice note, `mp3` plays almost everywhere, `wav` is uncompressed for editing. |
| **Bitrate** | Used by Opus and MP3. Opus is clamped to 6–256 kbps; MP3 is clamped to 32–320 kbps. Leave blank for defaults (`32` for Opus, `128` for MP3). |
| **Mono / voice-tuned** | Downmixes to one channel and uses Opus' `voip` tuning, matching normal chat voice-note expectations. Turn it off for stereo/music clips. |
Input and output are capped at 10 MiB. Batch conversion is not part of this single-file tool; run it once per voice note.
## FAQ
Is an OGG file always a voice note?
No. Ogg is a container. Chat voice notes normally use the **Opus** codec inside Ogg, while some generic converters create Ogg/Vorbis audio. This tool's `opus` target uses `libopus` and writes a `.opus` file intended for voice-note workflows.
What bitrate should I use for Opus voice messages?
For speech, `24`–`32` kbps is usually compact and clear. Use `48`–`64` kbps if the recording is noisy or important. For music or stereo clips, choose the Music-quality Opus preset (`96` kbps and mono off).
Can converting to MP3 or WAV improve a low-quality voice note?
No. Conversion changes the container/codec for compatibility or editing, but it cannot restore detail that was already lost in the original Opus recording. WAV is useful for editing because it avoids an extra lossy encode during your edit step.
Does the file leave my browser?
On the web page, no: ffmpeg runs locally in the browser and the converted audio is produced on your device. The CLI/chat surfaces may fetch a URL you provide, but the conversion itself still runs in the gizza tool runtime.
## Related tools
- [Convert an Audio File](https://gizza.ai/tools/audio-convert/): Convert any audio file to MP3, WAV, OGG, FLAC or M4A right in your browser — pick a bitrate for lossy formats. Runs locally, nothing is uploaded, free.
- [Extract Audio from a Video](https://gizza.ai/tools/extract-audio-from-video/): Pull the audio track out of any video as MP3 or WAV, right in your browser — pick a format and bitrate. Runs locally with ffmpeg, nothing is uploaded, free.
- [Compress an Audio File](https://gizza.ai/tools/audio-compress/): Shrink MP3, WAV, M4A or any audio file right in your browser — pick a target bitrate (96 kbps default) and format. Nothing is uploaded, free.
- [Strip Audio Metadata](https://gizza.ai/tools/audio-metadata-stripper/): Remove ID3 tags, comments, chapters, and cover art from MP3, FLAC, OGG, M4A, WAV, and other audio files in your browser. Stream-copy audio, no upload.
- [Trim an Audio File](https://gizza.ai/tools/trim-audio/): Trim any audio file in your browser — keep or remove a start–end range, add edge fades, save as MP3, WAV, FLAC or M4A. Runs locally, nothing is uploaded.