Audio Converter Online Free
A free browser-based audio converter supporting over 40 formats including MP3, WAV, FLAC, AAC, OGG, M4A, WMA, OPUS, and AIFF. Most conversions run entirely in your browser via FFmpeg WASM — files are not uploaded to any server. Batch processing handles up to 500 files at once with configurable bitrate (64–320 kbps), sample rate (22–96 kHz), and quality settings.
Transform and re-encode sound files between MP3, WAV, FLAC, OGG, AAC and 35+ formats
Convert audio between MP3, WAV, FLAC, OGG, AAC and 35+ other formats. Batch up to 500 files — adjustable bitrate, sample rate, and quality.
Features
How to Convert Audio Files
- Upload audio files. Drag and drop or click to select one or more files. Accepts MP3, WAV, FLAC, OGG, AAC, M4A, and 35+ other formats. Up to 500 files, 100 MB each, 2 GB total.
- Choose the target format. Select the output format from the dropdown. Browse by category (lossy, lossless, specialized) or search by name. Each format shows a brief description.
- Adjust quality settings. Set bitrate (64–320 kbps), sample rate (22–96 kHz), and quality level. Higher values mean better audio but larger files.
- Convert and download. Click "Convert" — most formats are processed in your browser without uploading. Download files individually or as a ZIP archive.
Frequently Asked Questions
What formats are supported?
Over 40 audio formats: MP3, WAV, FLAC, AAC, OGG, M4A, WMA, OPUS, AIFF, ALAC, APE, AMR, GSM, AC3, DTS and more. The full list is available in the format selector on the page.
Are my files uploaded to a server?
For most formats (MP3, WAV, FLAC, OGG, AAC, WMA, ALAC, OPUS, etc.) — no, processing happens locally in your browser via FFmpeg WASM. Only a few specialized formats (AMR, DTS, SPX, etc.) are temporarily uploaded to the server for conversion.
Which format should I choose?
For universal compatibility — MP3 or AAC. For lossless quality — FLAC or WAV. For Apple devices — M4A or ALAC. For smallest file size — OPUS or OGG. Not sure about your file? Check it with the audio inspector.
Why are some formats unavailable when selecting multiple files?
Server-processed formats (AMR, DTS, SPX, etc.) support only one file at a time. For batch conversion, choose a browser-supported format — they are marked in the format list.
What is the maximum file size?
Each file can be up to 100 MB, with a total limit of 2 GB for all files combined. For server-processed formats, the limit is one file up to 30 MB.
Is this converter really free?
Yes, completely free with no registration, watermarks, or hidden limits. Most conversions happen in your browser — the files never leave your device.
We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.
