{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-02T15:45:19.713Z","discovery":{"catalog":"https://toptool.io/tools.json","llmsTxt":"https://toptool.io/llms.txt","sitemap":"https://toptool.io/sitemap.xml"},"relatedTools":[{"slug":"aac-to-mp3","name":"AAC to MP3","url":"https://toptool.io/aac-to-mp3"},{"slug":"audio-trimmer","name":"Audio Trimmer","url":"https://toptool.io/audio-trimmer"},{"slug":"mp3-to-opus","name":"MP3 to Opus","url":"https://toptool.io/mp3-to-opus"},{"slug":"mp3-to-m4a","name":"MP3 to M4A","url":"https://toptool.io/mp3-to-m4a"},{"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":"wav-to-mp3","name":"WAV to MP3","url":"https://toptool.io/wav-to-mp3"}],"kind":"converter","slug":"mp3-to-aac","name":"MP3 to AAC","description":"Convert MP3 audio to AAC with selectable bitrate — free online, no upload.","longDescription":"Re-encode an MP3 file as raw AAC. AAC generally sounds better than MP3 at the same bitrate and is the default codec for the iTunes/Apple ecosystem and most modern streaming. Because the source is already lossy, expect some quality loss in the re-encode — pick a higher bitrate if you care. 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 aac","convert mp3 to aac","mp3 to aac converter","mp3 to aac online","mp3 to aac free","mp3 to aac online free","change mp3 to aac","mp3 aac converter","free mp3 to aac","online mp3 to aac converter"],"url":"https://toptool.io/mp3-to-aac","runsOn":"client","multiple":false,"batch":false,"input":{"type":"file","extensions":[".mp3"],"mimeTypes":["audio/mpeg","audio/mp3"]},"output":{"type":"file","extension":".aac","mimeType":"audio/aac"},"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-aac","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."}}