Free Online Audio Converter
Convert audio files between any format instantly. MP3, WAV, FLAC, OGG, AAC, and 20+ more formats supported.
Supported Formats
MP3
Universal compatibility, smaller files
WAV
Uncompressed, studio quality
FLAC
Lossless compression, audiophile choice
OGG
Open source, great for web
AAC
Apple ecosystem, efficient compression
M4A
iTunes compatible, high quality
Plus WMA, AIFF, OPUS, AC3, AMR, and many more...
Beyond choosing a format, Defyaudio gives you full control over the output quality settings. For MP3, you can select a bitrate from 64 kbps up to 320 kbps — the standard for CD-quality audio. If you need to convert MP3 to 320 kbps and 44100 Hz (44.1 kHz), simply set the bitrate to 320 kbps and the sample rate to 44100 Hz in the quality panel before converting. This combination delivers maximum MP3 fidelity with full compatibility across all players and platforms.
For lossless output, WAV and FLAC support sample rates up to 192 kHz and bit depths of 16, 24, or 32 bits. You can also adjust the number of channels (mono or stereo) to match the requirements of your target platform — useful for podcast hosting, game audio, or broadcast delivery specs.
20+ Formats
Support for all major audio formats
Quality Control
Adjust bitrate, sample rate, channels
Batch Convert
Process multiple files at once
Metadata
Preserve or edit audio tags
Why Use Our Audio Converter?
What Is a Multi Audio Converter? Complete Guide
A multi audio converter is a tool that can convert multiple audio files simultaneously, handling different formats and settings in a single session. Instead of converting files one at a time, a multi audio converter lets you queue up a batch of MP3, WAV, FLAC, or OGG files and process them all at once — saving significant time when working with large audio libraries or podcast archives.
Defyaudio's audio converter supports batch processing natively. You can load multiple files, apply the same output format and quality settings to all of them, and convert everything in parallel. Because the multi audio converter runs via FFmpeg WebAssembly in your browser, none of your files are uploaded — every conversion happens locally on your device with complete privacy.
Whether you need to standardise a collection of recordings to MP3 320 kbps and 44100 Hz, or batch-convert WAV stems to FLAC for archiving, the multi audio converter handles it all in one pass without compromising quality.
Free Batch Audio Converter — Convert Multiple Files at Once
Defyaudio's batch audio converter lets you convert multiple audio files simultaneously — no need to process files one at a time. Here is how to batch convert audio in seconds.
- 1
Open the Audio Converter
Navigate to the Audio Converter tool on the Defyaudio homepage.
- 2
Select multiple files
Click to browse and select all the audio files you want to convert, or drag and drop them all at once. The batch audio converter accepts MP3, WAV, FLAC, OGG, AAC, M4A and 20+ formats.
- 3
Choose output format
Pick your target format — MP3, WAV, FLAC, OGG, AAC and more. The same format and quality settings apply to all files in the batch.
- 4
Set quality (optional)
For MP3, set bitrate up to 320 kbps and sample rate to 44100 Hz for CD-quality output. You can also set channels to mono or stereo.
- 5
Convert and download
Click Convert. All files are processed in parallel in your browser and download instantly — no upload to any server.
Frequently Asked Questions
Which audio formats are supported?
We support over 20 audio formats including MP3, WAV, FLAC, OGG, AAC, M4A, WMA, AIFF, and more. Both input and output support all major formats.
Will converting affect audio quality?
Converting between lossless formats (WAV, FLAC) preserves full quality. When converting to lossy formats (MP3, AAC), you can choose the bitrate to balance quality and file size.
Can I convert multiple files at once?
Yes! You can batch convert multiple files simultaneously. Just select all the files you want to convert and they'll be processed together.
Do I need to upload my files to a server?
No! All conversion happens directly in your browser using FFmpeg WebAssembly. Your files never leave your device, ensuring complete privacy.
What bitrate should I choose?
For MP3, 320kbps is CD-quality. 256kbps is excellent for most uses. 128kbps is good for voice recordings or when file size matters. FLAC is always lossless.