{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-02T15:45:19.718Z","discovery":{"catalog":"https://toptool.io/tools.json","llmsTxt":"https://toptool.io/llms.txt","sitemap":"https://toptool.io/sitemap.xml"},"relatedTools":[{"slug":"m4a-to-mp3","name":"M4A to MP3","url":"https://toptool.io/m4a-to-mp3"},{"slug":"audio-trimmer","name":"Audio Trimmer","url":"https://toptool.io/audio-trimmer"},{"slug":"mp3-to-aac","name":"MP3 to AAC","url":"https://toptool.io/mp3-to-aac"},{"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-opus","name":"MP3 to Opus","url":"https://toptool.io/mp3-to-opus"},{"slug":"aac-to-mp3","name":"AAC to MP3","url":"https://toptool.io/aac-to-mp3"}],"kind":"converter","slug":"mp3-to-m4a","name":"MP3 to M4A","description":"Convert MP3 audio to M4A (AAC in MP4 container) — free online, no upload.","longDescription":"Re-encode an MP3 file as M4A — AAC inside an MP4 container, the format iTunes and the Apple ecosystem use natively. Because the source is already lossy, the re-encode will lose some quality; pick a higher bitrate if you care. Runs entirely in your browser using ffmpeg.wasm — your audio never leaves your device. Expect a few seconds for a 5-minute song.","category":"audio","categoryName":"Audio","keywords":["mp3 to m4a","convert mp3 to m4a","mp3 to m4a converter","mp3 to m4a online","mp3 to m4a free","mp3 to m4a online free","change mp3 to m4a","mp3 m4a converter","free mp3 to m4a","online mp3 to m4a converter","mp3 to itunes"],"url":"https://toptool.io/mp3-to-m4a","runsOn":"client","multiple":false,"batch":false,"input":{"type":"file","extensions":[".mp3"],"mimeTypes":["audio/mpeg","audio/mp3"]},"output":{"type":"file","extension":".m4a","mimeType":"audio/mp4"},"options":[{"type":"select","key":"bitrate","label":"AAC bitrate","defaultValue":"192k","choices":[{"value":"320k","label":"320 kbps (highest)"},{"value":"256k","label":"256 kbps"},{"value":"192k","label":"192 kbps (recommended)"},{"value":"128k","label":"128 kbps"},{"value":"96k","label":"96 kbps (smallest)"}],"help":"Higher bitrates = better quality and larger files."}],"invocation":{"webUi":"https://toptool.io/mp3-to-m4a","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."}}