{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-02T15:45:19.706Z","discovery":{"catalog":"https://toptool.io/tools.json","llmsTxt":"https://toptool.io/llms.txt","sitemap":"https://toptool.io/sitemap.xml"},"relatedTools":[{"slug":"flac-to-mp3","name":"FLAC to MP3","url":"https://toptool.io/flac-to-mp3"},{"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-aac","name":"MP3 to AAC","url":"https://toptool.io/mp3-to-aac"},{"slug":"mp3-to-m4a","name":"MP3 to M4A","url":"https://toptool.io/mp3-to-m4a"},{"slug":"mp3-to-opus","name":"MP3 to Opus","url":"https://toptool.io/mp3-to-opus"},{"slug":"wav-to-flac","name":"WAV to FLAC","url":"https://toptool.io/wav-to-flac"}],"kind":"converter","slug":"mp3-to-flac","name":"MP3 to FLAC","description":"Convert MP3 audio to FLAC (lossless) — free online, no upload.","longDescription":"Re-encode an MP3 file as FLAC, a lossless compressed format. Note that the MP3 source is already lossy — this conversion preserves whatever quality is in the MP3 but cannot restore detail the original encoder discarded. FLAC is still useful here for archival, for pipelines that require a lossless container, or for libraries that prefer FLAC. Runs entirely in your browser using ffmpeg.wasm; nothing is uploaded. Expect a few seconds for a 5-minute song; longer files may take a minute or two.","category":"audio","categoryName":"Audio","keywords":["mp3 to flac","convert mp3 to flac","mp3 to flac converter","mp3 to flac online","mp3 to flac free","mp3 to flac online free","change mp3 to flac","mp3 flac converter","free mp3 to flac","online mp3 to flac converter","mp3 to lossless"],"url":"https://toptool.io/mp3-to-flac","runsOn":"client","multiple":false,"batch":false,"input":{"type":"file","extensions":[".mp3"],"mimeTypes":["audio/mpeg","audio/mp3"]},"output":{"type":"file","extension":".flac","mimeType":"audio/flac"},"options":[],"invocation":{"webUi":"https://toptool.io/mp3-to-flac","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."}}