🎵 Free Browser Tool

Audio Format Converter

Convert audio files between FLAC, ALAC, MP3, AAC, OGG, WAV with metadata intact — right in your browser, no upload needed.

Convert FROM
Convert TO
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Drop audio files here or click to browse
Accepts .flac files · converts to .alac (m4a)
Guide

How to Convert Audio Files

Four simple steps — everything runs in your browser.

1

Choose Formats

Select your input format on the "From" row and your desired output format on the "To" row.

2

Add Files

Drop your audio files onto the drop zone or click to open a file picker. Multiple files are supported.

3

Convert

Click Convert All. FFmpeg.wasm loads once (~31 MB) and processes each file entirely inside your browser.

4

Download

Each converted file downloads automatically when it's done. Batch conversions download one by one.

Features

About This Tool

A private, browser-native audio converter powered by FFmpeg.wasm.

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100% Private

✓ No upload
Your audio files never leave your device. Everything — decoding, encoding, and the output file — happens inside your browser using WebAssembly. No accounts, no cloud, no logs.
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FLAC → ALAC

✓ Lossless remux
Converting FLAC to ALAC (Apple Lossless) is a lossless container swap — no audio data is re-encoded. The resulting .m4a file is bit-for-bit identical in audio quality and plays natively on iPhone, Mac, and Apple TV.
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Batch Conversion

✓ Multi-file
Drop an entire album at once. Files are queued and converted sequentially, each downloading automatically on completion. The log panel shows real-time status for every file.
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FFmpeg.wasm

✓ v0.12 · no COOP needed
Uses the single-threaded FFmpeg.wasm build — no SharedArrayBuffer, no special HTTP headers required. Works from a local file, any web server, or GitHub Pages without configuration.
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6 Formats

✓ FLAC ALAC MP3 AAC OGG WAV
Covers the most common lossless and lossy audio formats. Mix and match freely — the converter automatically selects the right FFmpeg codec flags and output container for every combination.
FAQ

Frequently Asked Questions

Common questions about audio conversion.

Yes. FLAC and ALAC are both lossless codecs. Converting between them is a remux — the raw PCM audio data is decoded and re-encoded into the other lossless format with zero quality loss. The output is mathematically identical to the original when decoded to PCM.

Apple's ecosystem — iPhone, iPad, Mac, and Apple TV — natively supports ALAC (.m4a) but not FLAC in older iOS versions or in iTunes/Music.app for syncing. ALAC was developed by Apple and is fully integrated into CoreAudio. Converting FLAC to ALAC gives you lossless quality with seamless Apple device compatibility.

There's no hard limit, but files are loaded into browser memory during conversion. Most single audio files (even full albums as a single FLAC) are under 500 MB, which is fine. For very large files on low-memory devices, use desktop FFmpeg: ffmpeg -i input.flac -c:a alac output.m4a

No. Once audio has been encoded as MP3 or AAC, quality lost to lossy compression cannot be recovered. Converting MP3 → FLAC produces a larger file with identical audio quality to the MP3. The only benefit is a lossless container for a source that is already lossy.

No. This is a fully client-side tool. FFmpeg.wasm runs entirely in your browser — your audio files, the conversion process, and the output file never leave your device. You can verify this by watching DevTools → Network: no audio data is ever uploaded.

Yes. the tool keeps all ID3 tags, metadata, and embedded cover art intact.