Free audio converter
OGG and OPUS to MP3 converter: WhatsApp voice notes, in your browser
To convert an OGG or OPUS file to MP3, pick it below: the converter decodes it and encodes the MP3 inside your browser, so the audio is never uploaded. It works with WhatsApp voice notes (.opus), Telegram voice messages (.ogg) and most audio files up to 25 MB and 15 minutes. Then play the MP3, download it, or transcribe it to text with HiText.
HiText takes OPUS, OGG and MP3 as they are and gives you the transcript and a summary. Your first 30 minutes are free.
Works in your browser: the audio isn't uploaded or saved anywhere.
How to convert a WhatsApp voice note to MP3
- 1
Save the voice note
On Android, WhatsApp keeps voice notes as .opus files in its Voice Notes folder; on iPhone, press and hold the voice note, tap Forward, then Share and Save to Files. Telegram voice messages are .ogg files.
- 2
Pick the file here
Choose it with the button above. The converter reads it in your browser and shows the progress while it encodes the MP3.
- 3
Play, download or transcribe
Listen to the MP3 to check it, tap Download MP3, or tap "Transcribe this audio to text with HiText" to get the words written out.
What the converter does
It decodes the audio with your browser's own audio engine and encodes it as MP3 at 44.1 kHz with lamejs, an open-source MP3 encoder (LGPL) that runs in the page: mono files at 64 kbps and stereo files at 128 kbps, which is plenty for voice. Nothing is sent to a server, so it also works with private messages.
If your browser can't read a file, you'll see a message instead of a broken MP3. The usual fix is Chrome or Firefox on a computer.
Need the text, not the MP3?
You don't have to convert a voice note to MP3 to transcribe it. HiText accepts OPUS and OGG directly: see WhatsApp audio to text and OGG and OPUS to text, or try the free audio to text tool. For subtitles, use the SRT to TXT converter.
Frequently asked questions
Is my audio uploaded?
No. The file is read, decoded and encoded to MP3 inside your browser. It isn't uploaded or stored anywhere, and the page doesn't need an account.
Which files can I convert?
Voice notes from WhatsApp (.opus) and Telegram (.ogg), plus OGA, M4A, WAV and WEBM audio, up to 25 MB and 15 minutes. Whether a format opens depends on your browser: if it can't read the file, you'll see a message.
What quality is the MP3?
44.1 kHz, 64 kbps for mono recordings like voice notes and 128 kbps for stereo. For voice that is more than the original voice note carries, so it won't sound worse.
Can I convert the voice note straight to text?
Yes, with HiText. It reads OPUS and OGG as they are, and gives you the transcript and an AI summary in minutes. Your first 30 minutes are free.
Is the converter free?
Yes, it's free and has no daily limit. It runs on your device, so we don't pay per conversion and don't need to limit it.
More tools
- Transcribe audio to text on iPhone and Android in minutes
- How to convert a WhatsApp voice message to text on iPhone and Android
- Transcribe a YouTube video to text from its link
- Transcribe interviews and meetings to text, with a summary
- How to translate audio to text in your own language
- How to convert a video to text without rewatching it
- How to convert an MP3 to text in a few minutes
- How to choose a transcription app (and what HiText does)
- How to transcribe a Zoom recording, even on a free Zoom account
- How to turn a voice recorder recording into text on Android
- How to get a Google Meet transcript from the recording
- How to turn an iPhone voice memo into text
- How to convert an M4A file to text
- How to get a Teams meeting transcript from the recording
- How to convert a WAV file to text
- How to turn a podcast episode into text
- How to turn a recorded lecture into text and study notes
- How to convert an OPUS or OGG file to text
- The best transcription apps in 2026, compared on what actually limits you
- An Otter.ai alternative for recordings you already have
- How to turn audio into notes you can actually use
- How to transcribe a sermon into text, with a summary
- The best transcription apps for iPhone in 2026, and when you don't need one
- Free transcription software and apps in 2026: what's actually free
- The best apps that record and transcribe in 2026
- The best meeting transcription apps in 2026, online and in person
- TurboScribe alternatives in 2026: when another tool fits better
- SRT to TXT converter: clean text from subtitles, and TXT to SRT
- HiText home
From voice note to text in minutes
HiText transcribes WhatsApp and Telegram audio as it is, with a summary. First 30 minutes free.
