Audio Converter Online — Convert Audio Files Free

An audio converter online lets you transform audio files between formats — MP3, WAV, AAC, FLAC, OGG — without installing software. Whether you need a WAV file for editing, an MP3 for sharing, or FLAC for archival, a browser-based converter handles it all locally using FFmpeg compiled to WebAssembly. No uploads, no server processing, no signup.

Keynou's audio converter supports all major audio formats with full control over bitrate, sample rate, and metadata preservation.

Supported Audio Formats

Each audio format serves a specific purpose. Here's a quick reference to help you choose the right output format:

Format Conversion Matrix

The converter handles all common conversion paths:

From	To	Quality Impact
WAV → MP3	Lossy compression	Quality loss (choose 320 kbps to minimize)
WAV → FLAC	Lossless compression	No quality loss, ~50% smaller
FLAC → MP3	Lossy compression	Quality loss (FLAC is lossless, MP3 is not)
MP3 → WAV	Decompression	No additional loss (but no quality recovery either)
AAC → MP3	Re-encoding	Generation loss — avoid if possible
OGG → MP3	Re-encoding	Generation loss — avoid if possible

Important: Converting between lossy formats (e.g., MP3 to AAC) always degrades quality because you're re-compressing already-compressed audio. Convert from a lossless source (WAV or FLAC) whenever possible. If your only source is a lossy file, convert only when necessary and use a high bitrate.

Batch Conversion

The audio converter supports batch processing — convert multiple files in a single session. This is essential when you need to:

• Convert an entire music library from one format to another
• Prepare audio assets for a game or app in a specific format
• Normalize a podcast series to a consistent format and bitrate
• Create format variants of the same audio (e.g., MP3 for web, FLAC for archive)

To batch convert: select multiple files, choose your output format and settings, and the converter processes each file sequentially. All processing happens locally — no upload queue, no per-file limits.

Bitrate Control

For lossy formats (MP3, AAC, OGG), bitrate is the primary quality lever. The converter offers standard bitrate presets:

Bitrate	MP3 Quality	AAC Quality	Use Case
96 kbps	Fair	Good	Speech, low-bandwidth
128 kbps	Good	Very good	Podcasts, general audio
192 kbps	Very good	Excellent	Music, web audio
256 kbps	Excellent	Near-transparent	High-quality streaming
320 kbps	Transparent	Transparent	Maximum MP3 quality

AAC achieves equivalent quality at roughly two-thirds the bitrate of MP3, so if you're converting to AAC, you can use a lower bitrate without sacrificing quality.

For lossless formats (WAV, FLAC), bitrate is determined by the audio content itself — there's no quality setting to adjust. FLAC does offer compression levels (0-8), but these only affect encoding speed and file size, not audio quality.

Metadata Preservation

Audio files often contain metadata — ID3 tags in MP3, Vorbis comments in OGG/FLAC, or AAC metadata — that store track titles, artist names, album information, and album art. The converter preserves metadata during format conversion when the target format supports it.

Conversion	Metadata Preserved
MP3 → AAC	Yes (title, artist, album, year, genre)
WAV → FLAC	Yes (Vorbis comments)
FLAC → MP3	Yes (ID3v2 tags)
AAC → MP3	Yes (ID3v2 tags)
Any → OGG	Yes (Vorbis comments)

If your source file has album art embedded, it carries over to the output when the target format supports it (MP3, FLAC, OGG). WAV has limited metadata support, so converting to WAV may lose some tag information.

Browser-Based Privacy

All conversion happens in your browser using FFmpeg WASM. Your audio files are loaded into local memory, processed on your device's CPU, and the converted files are offered as direct downloads. No file ever touches a remote server.

This is critical for:

• Musicians working with unreleased tracks
• Podcasters handling raw interview recordings
• Businesses processing confidential audio
• Anyone who values their privacy

Server-based converters like online-convert.com require you to upload files to their infrastructure. That introduces privacy risks, upload/download latency, and file size restrictions. Browser-based conversion eliminates all three.

Step-by-Step: Converting Audio Files

1. Open the audio converter
2. Select your audio file(s) — drag and drop or browse. Multiple files are supported for batch conversion.
3. Choose output format — MP3, WAV, AAC, FLAC, or OGG
4. Set quality options — bitrate for lossy formats, bit depth for WAV, compression level for FLAC
5. Click convert — FFmpeg WASM processes each file locally
6. Download the converted file(s) — no watermark, no signup, no upload

Common Conversion Scenarios

MP3 to WAV for Editing

If you need to edit audio in a DAW (Ableton, Logic, Pro Tools), convert MP3 to WAV first. DAWs process WAV more efficiently and avoid the generation loss that comes from editing compressed audio. Use 16-bit for general editing or 24-bit for production work.

FLAC to MP3 for Mobile Listening

FLAC files are large and some mobile players don't support them. Convert FLAC to MP3 at 192 kbps or 320 kbps for mobile playback — you get dramatically smaller files that play on every device.

WAV to FLAC for Archival

WAV files are uncompressed and take up significant storage. Converting WAV to FLAC reduces file size by 40-50% with zero quality loss, making it the ideal archival format. If you also need to extract audio from video sources, use the video to MP3 or video to WAV tools first.

Related Tools

• Audio Converter — Convert between MP3, WAV, AAC, FLAC, OGG
• Video to MP3 — Extract MP3 audio from video files
• Video to WAV — Extract lossless WAV audio from video

Further Reading

• FFmpeg Audio Encoding Wiki — Codec-specific encoding guides
• Digital Audio — Wikipedia — Fundamentals of digital audio sampling and quantization
• MDN: Web Audio API — Browser-based audio processing reference