Audio Converter
Convert audio between MP3, WAV, OGG, M4A, FLAC, and OPUS. Adjust bitrate and quality. Files never leave your device.
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How to Use the Audio Converter
Upload one or more audio files by dragging them into the upload zone or clicking to browse. Select the output format and adjust quality settings. Click Convert — on first use, the FFmpeg audio engine downloads to your browser and caches for future use. Each file converts in sequence and an inline audio player lets you listen before downloading. Download individual files or all results as a ZIP.
About This Tool
Every other online audio converter uploads your files to a remote server, processes them, and serves back a download link. This tool converts audio entirely in your browser using FFmpeg compiled to WebAssembly — the same FFmpeg used in professional video and audio production pipelines. Your files never leave your device. There is no upload, no server, no account, and no size limit beyond your browser’s available memory. Supports MP3, WAV, OGG Vorbis, M4A (AAC), FLAC, and Opus with full control over bitrate, sample rate, channels, and format-specific settings. You can also extract audio tracks from video files. Pair with the Video to GIF converter for video processing or the Image Converter for image format conversion.
Quick Reference Table
| Format | Type | Best For |
|---|---|---|
| MP3 | Lossy | Universal playback, sharing |
| WAV | Lossless (PCM) | Audio production, maximum quality |
| OGG | Lossy (Vorbis) | Web, open source, good quality/size |
| M4A | Lossy (AAC) | Apple devices, iTunes, podcasts |
| FLAC | Lossless | Archiving, audiophile listening |
| OPUS | Lossy | Streaming, voice, best quality per KB |
Frequently Asked Questions
Is my audio uploaded to a server?
No. This tool runs FFmpeg entirely in your browser using WebAssembly. Audio files are processed locally and never transmitted to any server. This makes the tool suitable for personal recordings, confidential interviews, and any audio you would prefer not to share with a third party.
Why does the first conversion take longer?
On first use, the browser downloads the FFmpeg WebAssembly engine (~30 MB). This is cached locally after the first download — all subsequent conversions start immediately without any download. The conversion itself is typically 2–10× faster than the audio duration depending on your device and the formats involved.
Can I extract audio from a video file?
Yes. Upload an MP4 or other video file and select your target audio format. FFmpeg extracts the audio track and re-encodes it. The video data is ignored.
Does converting from MP3 to FLAC improve quality?
No. Converting a lossy format to a lossless one does not restore the data that was discarded during the original lossy encoding. The FLAC output will be lossless — meaning you can convert it back to WAV without further quality loss — but it cannot recover what MP3 encoding removed. For quality preservation, always start from the original uncompressed or lossless source.
What is the largest audio file the converter can handle?
Browser memory is the real cap — the converter uses FFmpeg compiled to WebAssembly, and the full audio file must fit into memory during conversion. Desktop browsers typically handle files up to a few hundred megabytes comfortably (roughly 3–4 hours of WAV or FLAC at 44.1 kHz). Very long lossless files may benefit from being split before conversion.
Created by The Toobits Team · Engineering & Editorial
Toobits is built, tested, and maintained by a small independent engineering team. Every tool is written in TypeScript, runs entirely in the browser, and is reviewed against its source formulas before publication.
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