Drop an audio file here or click to browse
Supports MP3, WAV, OGG, FLAC, AAC, M4A, WebM
Source Audio
File:
Format:
Size:
Duration:
Preview
MP3 encoding requires the lamejs library. If it fails to load, WAV conversion is still available. For reliable MP3 encoding, consider desktop software like Audacity.
0%
Output format:
Output size:
Sample rate:
Channels:
Converted Audio Preview
Browser-based conversion. Your browser's Web Audio API decodes the source audio. Complex or rare formats may not decode in all browsers — desktop software like Audacity or FFmpeg handles edge cases more reliably.
Understanding Audio Formats, Conversion, and When to Use Each One
Audio files come in a wide variety of formats, each engineered for different use cases ranging from high-fidelity music production to compact streaming over mobile networks. Understanding the differences between audio formats — and when to convert between them — is essential for musicians, podcasters, content creators, developers, and anyone who works with sound. This free audio format converter lets you transform audio files between WAV and MP3 directly inside your browser using the Web Audio API, with no uploads, no server processing, and no sign-up required. Simply drop your audio file, choose your target format and settings, and download the result.
Common Audio Formats Explained
WAV (Waveform Audio File Format) is the standard uncompressed audio format originally developed by Microsoft and IBM. WAV files store raw PCM (pulse-code modulation) data, which means every sample of the audio waveform is recorded without any compression or data loss. This makes WAV the gold standard for recording, editing, and mastering audio, because there are zero compression artifacts. The trade-off is file size: a typical three-minute stereo song at CD quality (44,100 Hz, 16-bit) occupies roughly 30 MB as a WAV file. WAV is universally supported across every operating system, DAW (digital audio workstation), and media player.
MP3 (MPEG Audio Layer III) is the most widely recognized lossy audio format. MP3 uses psychoacoustic compression to discard audio data that the human ear is unlikely to perceive, achieving file sizes that are roughly 70–90% smaller than the equivalent WAV. At higher bitrates like 256 or 320 kbps, most listeners cannot distinguish MP3 from lossless audio in blind tests. MP3 remains the default format for portable music players, podcasts, audiobooks, and web audio due to its universal compatibility. However, because MP3 permanently discards data, re-encoding an MP3 file will further degrade quality — so it should never be used as a working format during production.
OGG (Ogg Vorbis) is an open-source lossy audio codec that generally achieves better sound quality than MP3 at the same bitrate. OGG is widely used in gaming, web applications, and open-source projects. Most modern browsers support OGG playback, making it a solid choice for web-based audio. Unlike MP3, the OGG Vorbis codec is completely patent-free.
FLAC (Free Lossless Audio Codec) provides lossless compression, reducing file sizes by 40–60% compared to WAV while preserving every single sample of the original audio. FLAC is the preferred format for audiophiles, music archivists, and anyone who wants smaller files without sacrificing quality. It supports metadata, album art, and sample rates up to 655,350 Hz.
AAC (Advanced Audio Coding) is a lossy format that generally outperforms MP3 at the same bitrate. AAC is the default audio format for Apple devices, YouTube, and most streaming services. The M4A container typically wraps AAC audio data. AAC offers better stereo encoding and handles high frequencies more gracefully than MP3.
Lossy vs. Lossless Audio
Lossy formats (MP3, OGG, AAC) permanently remove audio information using psychoacoustic models. They analyze the audio spectrum and discard frequencies, harmonics, and quiet passages that are masked by louder sounds. The bitrate setting controls how aggressively data is discarded — higher bitrates preserve more detail. Once data is removed, it cannot be recovered by converting to a lossless format. Lossless formats (WAV, FLAC) preserve every sample of the original recording. FLAC compresses the data (like a ZIP file for audio), while WAV stores it raw. Converting lossless to lossy is a one-way operation: the conversion from WAV to MP3 discards data, but converting from MP3 back to WAV simply wraps the already-degraded audio in a larger container without restoring the lost information.
When to Convert Between Audio Formats
- Sharing and distribution — Convert WAV or FLAC to MP3 for email attachments, podcast hosting, or uploading to platforms with file size limits.
- Editing workflows — Convert MP3 or AAC to WAV before editing in a DAW to avoid re-encoding artifacts on each save.
- Web compatibility — Convert FLAC or M4A to WAV or MP3 for broad browser and device support.
- Archival — Convert WAV recordings to FLAC for long-term storage at roughly half the file size with no quality loss.
- Reducing file size — Convert large WAV files to MP3 at 192–256 kbps for everyday listening with minimal audible difference.
Frequently Asked Questions
Will converting MP3 to WAV improve audio quality?
No. Converting a lossy file to a lossless container does not restore discarded audio data. The WAV file will be larger but will sound identical to the original MP3. Always start from the highest quality source available.
What sample rate should I use?
44,100 Hz (CD quality) is sufficient for virtually all listening purposes. Use 48,000 Hz if your project targets video production, as 48 kHz is the standard audio sample rate for film and television.
Should I choose mono or stereo?
Use stereo for music, sound effects, and any audio where spatial information matters. Use mono for voice recordings, podcasts, and phone audio — it halves the file size and most spoken content has no meaningful stereo field.
Why can't this tool convert to FLAC or OGG?
Browser-based JavaScript can reliably encode WAV (raw PCM) and MP3 (via the lamejs library). Encoding FLAC and OGG in the browser is technically possible but requires large WebAssembly codecs. For those formats, desktop software like Audacity or FFmpeg is recommended.
All processing happens entirely in your browser. Your audio files are never uploaded to any server. No data leaves your device.
This audio format converter is completely free, requires no sign-up, and works entirely in your browser. Upload your audio file, choose a target format, adjust sample rate and channels, preview the result, and download — your files stay private on your device at all times.