Audio Converter

Convert Audio Files Free — MP3, WAV, OGG, M4A, AAC, FLAC

This tool converts audio files between formats using the Web Audio API for decoding and lamejs for MP3 encoding, entirely in your browser. No file is uploaded, no account is needed, and there is no server-side file size limit. Drop one or more audio files, pick an output format, and download the converted result immediately.

How to Convert an Audio File

Drop one or more audio files into the upload area, or click to select them from your device. Choose MP3 or WAV as the output format from the tabs below the upload area. If you select MP3, pick a bitrate: 128, 192, 256, or 320 kbps. Click Convert. Each file is processed in sequence and downloads automatically when it finishes. A preview player appears for the first converted file so you can check the result before using it elsewhere.

Batch conversion works the same way. Select several files at once and all of them convert in a single click. Each output file downloads with the original filename and the new extension.

What Audio Formats Are Supported?

The input formats available depend partly on your browser. All major browsers decode MP3, WAV, M4A, and AAC natively. OGG (Vorbis) and FLAC require Chrome or Firefox, as Safari does not decode those codecs. Output is either MP3 at a bitrate you choose, or WAV as lossless uncompressed PCM audio.

• Input formats: MP3, WAV, OGG (Vorbis), M4A, AAC, FLAC
• Output formats: MP3 at 128, 192, 256, or 320 kbps; WAV (lossless PCM)
• Browser note: OGG and FLAC require Chrome or Firefox. Safari users should convert to MP3 or WAV first.

MP3 vs. WAV: Which Output Should You Choose?

MP3 uses lossy compression. Some audio data is permanently discarded to make the file smaller. WAV stores raw, uncompressed PCM audio with zero quality loss. A 3-minute song is typically 3-5 MB as MP3 at 128 kbps and 30-50 MB as WAV at standard sample rates.

Choose MP3 when you need a compact file for sharing, streaming, or storing on a mobile device. Choose WAV when you plan to edit the audio in a DAW, sync it to a video project, or archive it without any generation loss. Every time you re-encode a lossy file, quality degrades slightly. WAV avoids that cycle entirely.

Which MP3 Bitrate Should You Use?

Bitrate sets how much audio data is stored per second. Higher bitrate means larger file and better quality. The difference between 192 and 320 kbps is inaudible on most consumer headphones, but clearly noticeable on studio monitors or high-quality speakers.

• 128 kbps: best for voice recordings, podcasts, and spoken-word content where small file size matters more than high fidelity.
• 192 kbps: a good balance for casual music listening. Most listeners can't tell this apart from 320 kbps on earbuds or laptop speakers.
• 256 kbps: recommended for music you care about. Differences from lossless audio are minimal on most playback equipment.
• 320 kbps: maximum MP3 quality. Use for archiving music or when files will play on high-fidelity audio equipment or studio monitors.

Why Should Audio Conversion Happen Locally?

Voice memos, interview recordings, podcast drafts, and meeting recordings often contain spoken content that is private or confidential. Sending those files to a third-party conversion server means the audio passes through infrastructure you don't control. It can be logged, stored, or processed in ways that aren't visible to you.

This tool converts audio entirely inside your browser tab using the Web Audio API and the lamejs encoder. Your files never leave your device. There is no transmission, no server log, and no risk of your recordings reaching an external system.