Convert a Voice Note

Turn Opus/Ogg chat voice messages into MP3 or WAV — or make a real .opus voice note from audio. Runs locally in your browser.

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:

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.

Developer & Automation Access

Run it from the terminal

Same engine as this page, headless — via the gizza CLI:

gizza tool voice-note-converter 'url=https://example.com/input' 'format=opus' 'mono=true'

New to the CLI? Get gizza →

Open it by URL

Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:

https://gizza.ai/tools/voice-note-converter/?url=https://example.com/input&format=opus&mono=true

Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.