Where do ogg and opus files come from?
The best-known example: WhatsApp voice messages are opus audio in an ogg container. Telegram and many open-source recorders use this format too. Export the voice message (share → save as file) and upload it to Murmel; no conversion needed.
How it works
- Upload your file. Drop your ogg file into the Studio; conversion is never needed.
- Murmel transcribes. The text is ready within minutes, with speaker labels if you want them.
- Correct and export. Replay the audio next to the text, adjust where needed and export to Word, text or subtitles.
Dutch model, Dutch servers
Murmel runs on a model trained specifically for Dutch speech that makes fewer errors than open-source alternatives such as Whisper in a public benchmark. Processing happens on servers in the Netherlands, your file is automatically deleted after 7 days and is not used for AI training unless you explicitly opt in.
What does it cost?
Prepaid credits cost €1 per 50 minutes of audio (excl. VAT), available from €5 and valid for 6 months: a one-off file costs cents, no subscription. Transcribing regularly? Try 14 days for €0.01 first, then from €9 per month (excl. VAT), cancel monthly.
Frequently asked questions
How do I convert a WhatsApp voice message to text?
Long-press the voice message, choose share or forward, save it as a file (or email it to yourself), and upload the file in the Murmel Studio. The transcript is ready within a minute.
Does Murmel also support standalone .opus files?
Yes, both .ogg and .opus are read directly.
What does converting a ogg file to text cost?
With prepaid credits you pay €1 per 50 minutes of audio (excl. VAT), available from €5 and valid for 6 months. Or try 14 days for €0.01 and then from €9 per month (excl. VAT), cancel monthly.
Where is my file processed?
On servers in the Netherlands. Your file never leaves the EU, is automatically deleted after 7 days and is not used for AI training unless you explicitly opt in.