Audio Format Converter

Convert audio files between MP3, WAV, OGG, AAC, FLAC, and WebM formats.

Tested tool guide Tested browser tools Checked August 15, 2026

What Audio Format Converter does, with a checked example

This tool takes an audio file you pick, decodes it in your browser, and re-encodes the audio into MP3, WAV, OGG, AAC, FLAC, or WebM at a bitrate or quality level you set, without uploading the file anywhere. The mistake people make most often: conversion cannot restore information a lossy codec already threw away. Taking an MP3 and converting it to FLAC or WAV yields a bigger file with the same MP3-era artifacts baked in, not the original studio-quality audio back.

Worked example

A concrete input and expected output from the current implementation.

Input

a 30-second WAV recording, 44.1 kHz, 16-bit, stereo, converted to MP3 at 128 kbps

Expected output

an MP3 file of about 480 KB (128,000 bits/s x 30 s / 8 = 480,000 bytes), versus roughly 5.29 MB for the source WAV (44,100 samples/s x 2 bytes x 2 channels x 30 s)

MP3 output size at a fixed bitrate is bitrate x duration / 8, independent of the source file's size; the WAV figure is just uncompressed PCM math for the same clip.

How the result is produced

Decode, then re-encode

The browser reads the source file's container and codec, decodes it to raw PCM audio samples, then feeds those samples into an encoder for the target format at the settings you chose. Every conversion passes through this decode-then-encode step, even between two lossy formats, which is why chaining lossy conversions compounds quality loss rather than transferring it cleanly.

Bitrate and quality controls

Lossy targets (MP3, OGG, AAC, WebM) expose a bitrate or quality slider that trades file size for fidelity. Lossless targets don't need one: FLAC applies lossless compression to the PCM data, and WAV stores it uncompressed, so a FLAC file of the same audio is typically smaller than the equivalent WAV despite carrying identical sample data.

Good uses

shrinking a WAV field recording into MP3 before emailing it or posting it to the web
converting a FLAC album rip to AAC or MP3 to fit a phone's storage limits
pulling a WebM or OGG voice memo into WAV so it opens in an editor that doesn't read those containers

Limits and checks

converting a lossy source to FLAC or WAV increases file size but does not recover any quality lost in the original encoding
ID3 tags, cover art, and other metadata may not carry over to the new format depending on what the target format supports
very long or high-resolution files decode and encode entirely in the browser tab, so large batches can be slow or memory-heavy on lower-end devices

Common questions

If I convert my WAV to MP3 and then back to WAV, do I get the original quality back?

No. The MP3 step permanently discards audio data to reach its target bitrate. Converting that MP3 back to WAV just repackages the already-lossy audio as uncompressed PCM; the file gets bigger but the missing detail is gone for good.

Does the tool upload my audio file to a server to convert it?

No, the decode and encode steps run locally in your browser tab. That also means conversion speed depends on your device's own CPU, and very large files or long batches will take longer on slower hardware.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.