Filr
All toolsAudio converter

Browser-local media conversion

WAV to MP3 Converter

Convert uncompressed WAV audio to MP3 locally in your browser. No file upload, server conversion, or paid conversion API.

Processed locally

Your media file is processed in this browser and is not uploaded to our servers.

Drop your WAV file here

or choose one from your device

Maximum 100 MiB · processed locally

How it works

Local conversion in four clear steps

  1. 1

    Choose a file

    Select a WAV file up to 100 MiB from your device.

  2. 2

    Choose bitrate

    Select a supported constant MP3 bitrate.

  3. 3

    Convert locally

    Your browser loads the self-hosted FFmpeg engine and processes the file locally.

  4. 4

    Download

    Save the generated file directly to your device.

Format details

Smaller audio with a clear bitrate choice

WAV commonly stores uncompressed audio, while MP3 uses lossy compression. Choose 128, 192, 256, or 320 kbps; higher bitrates generally increase both retained audio quality and file size.

Helpful answers

Frequently asked questions

Is my media file uploaded?

No. Your file is written only to FFmpeg's temporary browser-local virtual filesystem and is never sent to a conversion server.

Does MP3 preserve every WAV sample?

No. MP3 is a lossy format, so conversion trades some audio information for a smaller file.

Which MP3 encoder is used?

The local FFmpeg engine uses libmp3lame and verifies that the encoder is available before conversion.