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Audio Tools
Convert MP3 files to OPUS client-side. No upload, full quality control.
Open mp3 → opusYour specific task is estimate mp3 file size from bitrate and duration. Open the page, drop your input, get the result — typically under a second.
Your goal is convert mp3 files to opus client-side. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. MP3 Size focuses on estimate mp3 file size from bitrate and duration; mp3 → opus focuses on convert mp3 files to opus client-side. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both MP3 Size and mp3 → opus work without signup. We only ask for an email if you decide to subscribe to a paid plan.