{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-02T15:45:19.729Z","discovery":{"catalog":"https://toptool.io/tools.json","llmsTxt":"https://toptool.io/llms.txt","sitemap":"https://toptool.io/sitemap.xml"},"relatedTools":[{"slug":"mp3-to-aac","name":"MP3 to AAC","url":"https://toptool.io/mp3-to-aac"},{"slug":"audio-trimmer","name":"Audio Trimmer","url":"https://toptool.io/audio-trimmer"},{"slug":"mp3-to-wav","name":"MP3 to WAV","url":"https://toptool.io/mp3-to-wav"},{"slug":"mp3-to-ogg","name":"MP3 to OGG","url":"https://toptool.io/mp3-to-ogg"},{"slug":"mp3-to-flac","name":"MP3 to FLAC","url":"https://toptool.io/mp3-to-flac"},{"slug":"mp3-to-m4a","name":"MP3 to M4A","url":"https://toptool.io/mp3-to-m4a"},{"slug":"wav-to-mp3","name":"WAV to MP3","url":"https://toptool.io/wav-to-mp3"},{"slug":"ogg-to-mp3","name":"OGG to MP3","url":"https://toptool.io/ogg-to-mp3"}],"kind":"converter","slug":"mp3-to-opus","name":"MP3 to Opus","description":"Convert MP3 audio to Opus with selectable bitrate — free online, no upload.","longDescription":"Re-encode an MP3 file as Opus, a modern open codec that delivers near-transparent quality at remarkably low bitrates — Opus at 96 kbps typically rivals MP3 at 160–192 kbps. Great for podcasts, voice notes, and anywhere bandwidth or storage matters. Because the source is already lossy, expect some loss in the re-encode. Runs entirely in your browser using ffmpeg.wasm — nothing is uploaded. Expect a few seconds for a 5-minute song.","category":"audio","categoryName":"Audio","keywords":["mp3 to opus","convert mp3 to opus","mp3 to opus converter","mp3 to opus online","mp3 to opus free","mp3 to opus online free","change mp3 to opus","mp3 opus converter","free mp3 to opus","online mp3 to opus converter"],"url":"https://toptool.io/mp3-to-opus","runsOn":"client","multiple":false,"batch":false,"input":{"type":"file","extensions":[".mp3"],"mimeTypes":["audio/mpeg","audio/mp3"]},"output":{"type":"file","extension":".opus","mimeType":"audio/opus"},"options":[{"type":"select","key":"bitrate","label":"Opus bitrate","defaultValue":"96k","choices":[{"value":"160k","label":"160 kbps (highest, near-transparent)"},{"value":"128k","label":"128 kbps"},{"value":"96k","label":"96 kbps (recommended)"},{"value":"64k","label":"64 kbps"},{"value":"48k","label":"48 kbps (voice)"},{"value":"32k","label":"32 kbps (smallest, voice)"}],"help":"Opus is very efficient — 96 kbps already rivals MP3 at ~190 kbps."}],"invocation":{"webUi":"https://toptool.io/mp3-to-opus","api":null,"notes":"Currently runs client-side in the user's browser. Drop a file on the UI at `webUi` and download the converted result. A remote MCP/REST API is planned."}}