๐Ÿงฐ UtlKit

Audio Converter

Convert audio files between WAV and MP3 directly in your browser. Change bitrate and sample rate. No upload needed.

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Drop audio files here or click to select
Supports MP3, WAV, OGG, FLAC, M4A, AAC
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๐Ÿ“Š Data Summary (auto-filled)

Tool: audio-converter ยท /tools/audio-converter/

format: mp3

bitrate: 128

sampleRate: original

count: 0

What is this tool?

An Audio Converter changes the format of any audio file. Upload MP3, WAV, OGG, FLAC, M4A, or AAC files and re-encode them as lossless WAV or compressed MP3. Choose the MP3 bitrate (64โ€“320 kbps) and sample rate (22.05 / 44.1 / 48 kHz) to balance file size and quality. Each file shows a waveform preview, playback, and a live size comparison before you download. All decoding and encoding happens client-side in your browser.

When to use this tool

  • Compress large audio for sharing

    Turn bulky WAV or FLAC recordings into smaller MP3 files at a bitrate you choose, making them easy to email, text, or post online.

  • Get lossless WAV from compressed files

    Convert MP3 or M4A to WAV as a first step before editing in a DAW. Note this removes compression artifacts only in the sense of giving your editor an uncompressed source to work with.

  • Standardize sample rates

    Resample a mix of 48 kHz and 44.1 kHz recordings to a single rate so they can be combined or uploaded to a platform that requires a specific sample rate.

  • Reduce file size for voice notes

    Export speech recordings as low-bitrate MP3 (64โ€“96 kbps) at 22.05 kHz for the smallest possible files that are still perfectly intelligible.

How to use

  1. 1

    Upload audio files

    Click the upload area or drag and drop audio files. Supports MP3, WAV, OGG, FLAC, M4A, and AAC. Multiple files are supported.

  2. 2

    Choose output format

    Select WAV (lossless, larger files) or MP3 (compressed, smaller files). MP3 is best for sharing and streaming; WAV is best for editing and archiving.

  3. 3

    Adjust bitrate and sample rate

    For MP3, pick a bitrate from 64 to 320 kbps โ€” higher means better quality and larger files. Optionally resample to 22.05, 44.1, or 48 kHz, or keep the original rate.

  4. 4

    Preview and download

    Play each file, check the waveform and the new file size, then download files individually or all at once.

Frequently Asked Questions

What is the difference between WAV and MP3?

WAV is an uncompressed, lossless format that stores every audio sample exactly, so files are large but quality is perfect. MP3 is a lossy compressed format that removes audio data the ear is less likely to hear, producing much smaller files at the cost of some quality. Use WAV for editing and archiving, MP3 for sharing and playback.

Why is my MP3 file bigger than expected?

MP3 file size depends on bitrate, duration, and channels. A 5-minute stereo song at 320 kbps is around 7.5 MB, while the same at 96 kbps is about 3.6 MB. Longer duration, higher bitrate, and stereo (vs mono) all increase size. If the source is low quality, a high bitrate won't improve it โ€” it just stores the original artifacts at higher fidelity.

Can I convert MP3 back to the original quality?

No. MP3 is lossy โ€” some audio data is permanently discarded when it was first encoded. Converting MP3 to WAV makes the file uncompressed, but it cannot restore the data that was already lost. The WAV will sound the same as the MP3, just with a larger file size. For the best quality, keep and convert from the original lossless source when possible.

What sample rate should I choose?

44.1 kHz is the CD standard and covers the full range of human hearing; 48 kHz is common for video and professional audio. 22.05 kHz is half of CD quality and is fine for voice memos or speech where you want smaller files. If you are unsure, keep the original rate โ€” changing it only helps if you specifically need a lower rate to save space.

Is my audio uploaded to a server?

No. The tool decodes and re-encodes your audio entirely in the browser using the Web Audio API. No audio data is sent anywhere. You can confirm by checking your browser's network tab, which stays empty while converting.

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