SoundCuibu SoundCuibu

Free Online Audio Converter

Convert audio files between MP3, WAV, FLAC, OGG, AAC, M4A, OPUS and WMA — instantly, free.

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Max file size: 60MB. Files are stored temporarily for processing and deleted on scheduled cleanup (typically within 12 hours).
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How to Convert Audio Files Online

Converting audio files between different formats is one of the most common tasks for musicians, podcasters, and everyday users alike. Whether you need to compress a large WAV file into a smaller MP3 for sharing, convert an OGG file from a game into a standard format, or create a lossless FLAC copy of your music library, SoundCuibu's free online audio converter handles it all without requiring any software download or installation.

Supported Audio Formats

Our universal converter supports the most widely used audio formats:

  • MP3 — The universal standard for music and podcasts. Excellent compression with good quality, supported by every device and platform.
  • WAV — Uncompressed audio offering lossless quality. Ideal for professional audio work, recording, and editing. Large file sizes.
  • FLAC — Free Lossless Audio Codec. Compresses audio without any quality loss, roughly half the size of WAV. Perfect for archiving music.
  • OGG (Vorbis) — Open-source compressed format. Often used in games, apps, and streaming. Great quality at low bitrates.
  • AAC — Advanced Audio Coding. The successor to MP3 with better quality at the same file size. Default format for Apple devices and YouTube.
  • M4A — AAC audio wrapped in an MPEG-4 container. Widely used on iPhones, iPads, and iTunes.
  • OPUS — Modern, highly efficient codec ideal for voice and music streaming. Used by Discord, WhatsApp, and WebRTC applications.
  • WMA — Windows Media Audio, Microsoft's proprietary format. Commonly found on older Windows systems and Zune devices.

Choosing the Right Output Format

The best output format depends on your use case. For sharing music online or loading songs onto a phone, MP3 at 192 kbps or 320 kbps is the safe choice — universally compatible and reasonably small. For archiving your music collection without quality loss, choose FLAC. For Apple ecosystem users, AAC/M4A offers better quality than MP3 at the same file size. For voice recordings or podcasts where file size matters most, OPUS delivers excellent clarity at very low bitrates.

Is Quality Lost During Conversion?

Converting between two lossy formats (e.g., MP3 to AAC) always involves some generation loss because the audio is decoded and re-encoded. To minimise quality loss, always convert from the highest-quality source available. Converting lossless formats (WAV, FLAC) to a lossy output (MP3, AAC) loses some data, but the result sounds great at high bitrates. Converting from lossy to lossless (MP3 to WAV) does not recover lost quality — the file will be larger but not better sounding.

Privacy and File Handling

Your uploaded files are processed on secure servers and automatically deleted within 12 hours. We never share or analyse your audio content. For highly sensitive recordings, consider using offline tools.

How it works

  1. Click "Upload Audio" and select your audio file (MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, or WMA).
  2. Choose your desired output format from the dropdown menu.
  3. Adjust optional settings such as bitrate or sample rate if needed.
  4. Click "Convert" and wait a few seconds for processing.
  5. Download your converted audio file.

FAQ

What audio formats can I convert between?
You can convert between MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, and WMA in any combination.
Is the audio converter completely free?
Yes, all conversions are 100% free with no account required. Server-side file size limits may apply.
Will I lose quality converting MP3 to WAV?
Converting MP3 to WAV produces a larger file but does not restore quality that was lost during the original MP3 compression. Start from a lossless source whenever possible.
What is the best format for streaming music?
AAC and OPUS offer the best quality-to-size ratio for streaming. MP3 is the most compatible choice if you need broad device support.
How large a file can I upload?
The maximum upload size is determined by server configuration. Typical limits are 200–500 MB. For very large files consider splitting first.
How long does conversion take?
Most conversions complete in seconds. Large files or slow connections may take up to a minute.
Is my audio file kept private?
Yes. Files are processed on secure servers and deleted automatically within 12 hours. We do not listen to or share your audio.
Can I convert multiple files at once?
Currently one file is processed at a time. Upload and convert each file separately.
What bitrate should I choose for MP3?
128 kbps is acceptable for voice; 192 kbps is good for music; 320 kbps is the highest quality MP3 setting and recommended for music archiving.
Does FLAC conversion preserve metadata tags?
Yes, ID3/Vorbis tags such as title, artist, and album are preserved when converting between most formats.

Related tools

Privacy note: files are stored temporarily for processing and deleted on scheduled cleanup (typically within 12 hours).
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