Is my audio uploaded?

No. Decoding and encoding run locally through FFmpeg compiled to WebAssembly. The file never reaches Haivix servers.

Which input formats can I convert?

Anything FFmpeg can decode, including MP3, WAV, M4A and AAC, FLAC, OGG, Opus, AIFF, WMA, and AMR. Audio tracks inside video files are also accepted, and the video stream is dropped.

Does converting reduce quality?

Converting between lossy formats, such as MP3 to M4A, re-encodes the audio and adds a small generation loss. Converting to WAV or FLAC preserves the decoded audio exactly, but cannot restore detail that a lossy source already removed.

Which bitrate should I pick?

128 kbps suits spoken podcasts, 192 kbps is a good balance for most music, and 256 or 320 kbps keeps more detail for archival or high-quality listening. Bitrate only applies to MP3, M4A, and Opus output.

Why does the first conversion take longer?

The browser downloads the FFmpeg core, about 32 MB, the first time. It is cached afterwards, so later conversions start almost immediately.

Can I trim or join audio here?

No. This tool converts the whole file. Trim a video or audio clip first, then convert the trimmed result.

Audio Converter — MP3, WAV, M4A & FLAC

What Audio Converter helps you do

Convert an audio file to the format a device, editor, or upload form actually accepts. Pick an output format and bitrate, and the conversion runs locally through FFmpeg compiled to WebAssembly, so the recording never leaves your computer. It also accepts the audio track from a video file and drops the picture.

Decoding and encoding run in your browser through FFmpeg.wasm. Your audio file is never uploaded; the FFmpeg core downloads once and is cached afterwards.

How it works

The file is demuxed and decoded by an FFmpeg build running in WebAssembly inside the page. The decoded audio is encoded in the output format and bitrate you choose, then packaged for download. Video streams are ignored. The first run downloads the FFmpeg core, which is cached by the browser for later conversions.

How to use Audio Converter

Drop an audio file, or browse to select one from your device.
Choose the output format, and set a bitrate when the format is lossy.
Select Convert audio, preview the result, then download the converted file.
If the first run pauses, wait for the FFmpeg core to finish downloading.

When to use it

Turn a WAV recording into a smaller MP3 for a podcast host or email.
Convert an M4A voice memo into a format an editor or transcription service accepts.
Export FLAC or Opus audio into broadly supported MP3 or WAV.
Extract the audio from a video without keeping the picture.
Standardize a folder of recordings before uploading them.
Make a smaller copy of a long interview for a mobile device.

When not to use it

Do not convert an already lossy file repeatedly; start from the highest-quality source you have.
Do not expect FLAC or WAV to restore detail removed by an earlier MP3 encode.
Do not use it to trim, join or clean up noise; those are separate steps.

Example

A 42-minute interview is recorded as WAV at 48 kHz. The podcast host accepts only MP3, so it is converted at 128 kbps for speech. The WAV master stays in the archive, and the MP3 is checked in the host's preview player before publishing.

What you can do with Audio Converter

Convert between MP3, M4A, WAV, OGG, Opus and FLAC.
Choose a bitrate for lossy output formats.
Read audio from common video containers and discard the video.
Preview the converted file before downloading it.
Keep the source and the output on your device.
Reuse the cached FFmpeg core on later conversions.

Example: prepare a podcast upload

Export the recording as WAV from the editor, then convert it to MP3 at 128 kbps for a spoken podcast. Keep the WAV master for future edits and use the MP3 for the host that requires it.

If the source is a video interview, convert the MP4 directly and let the tool read only the audio track. That avoids a separate extraction step and keeps the video out of the upload.

Check the converted file in the destination app before deleting anything. A format that opens in one player can still fail in an older device or a strict upload form.

What to know before you start

Converting between lossy formats re-encodes the audio and adds a small generation loss.
The whole file is converted; trimming and joining are separate tools.
Very long recordings use a lot of browser memory and may fail on low-memory devices.
The first conversion in a session downloads the roughly 32 MB FFmpeg core.
Some uncommon codecs may not be supported by the browser build.

Common mistakes

Converting an MP3 to another lossy format and expecting better quality.
Choosing 320 kbps for speech that will be compressed again by the platform.
Deleting the WAV master after making an MP3.
Assuming FLAC output will be smaller than WAV; it is lossless and can still be large.
Forgetting that the first conversion needs the FFmpeg download.

Troubleshooting

If the conversion fails immediately, the source codec may not be supported by the browser build. Try a common format such as MP3, WAV or M4A first.

If the output is silent, check that the source actually contains an audio track; a video with no sound produces no audio.

If the first run is slow, the FFmpeg core is still downloading. Later conversions reuse the cached copy.

If the result sounds worse than expected, the source was probably already lossy. Convert from the original recording when possible.

If a long file fails on a phone, the browser ran out of memory. Convert a shorter section or use a desktop.

Audio Converter