ZeroFee Tools
Free audio converter changing MP3, WAV, OGG and M4A files in a browser
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Audio Converter

Free Audio Converter - No Signup, No Limits

ZeroFee Tools' free audio converter is an online tool that converts MP3, WAV, OGG, M4A, FLAC and AAC files, and extracts audio from MP4, MOV or WebM video. It is free and unlimited: no signup, no watermark, no daily caps. Everything is processed on your device, so your files are never uploaded anywhere.

Drop audio or video files here or click to browse

MP3, WAV, OGG, M4A, FLAC, AAC · MP4, MOV, WebM (audio extracted) · up to 10 files · files stay on your device

Convert to

First conversion downloads the converter engine (~30 MB) - after that it's cached and fast.
Tip: "Download all" triggers one download per file - your browser may ask permission for multiple downloads once.

Frequently asked questions

Is this audio converter really free and unlimited?

Yes. No signup, no watermark, no daily caps. Popular converters limit free users to 2-10 files a day and charge $8-20/month beyond that. This one runs entirely in your browser with ffmpeg.wasm, so there is no server cost to throttle you on.

Are my files uploaded to a server?

No. Audio conversion happens locally on your device. Your audio and video files never leave your computer, so they cannot be stored, viewed or leaked.

Which audio formats can I convert between?

Input: MP3, WAV, OGG, M4A, FLAC, AAC, Opus, plus video files (MP4, MOV, WebM, MKV) for audio extraction.
Output: MP3, WAV (lossless), OGG, M4A.

What bitrate should I choose when converting audio?

192 kbps MP3 sounds great for music and is the best size-to-quality balance. Use 128 kbps for voice and podcasts to save space, 320 kbps for maximum quality. WAV is uncompressed and lossless: pick it for editing, but expect much larger files.

Why is the first conversion slow?

The first run downloads the conversion engine (~30 MB, cached afterwards). Converting large videos is CPU-intensive: it can take a while on older phones, and very long videos may hit browser memory limits.

Can I extract audio from a video file?

Yes: drop any MP4, MOV or WebM video and choose MP3 or WAV as output. The video track is discarded and you get just the audio, perfect for lectures, podcasts and music.

How do I convert an MP3 to WAV for free?

Short answer: Drop your MP3 into the converter above, select WAV as the output format and click Convert all. The tool re-encodes the file in your browser and downloads the lossless WAV. There is no signup, no file-size gate and no daily limit, so you can convert as many MP3s as you want while nothing is uploaded to a server.

WAV is uncompressed, so the converted file will be much larger than the original MP3. Choose WAV when you plan to edit the audio (podcast production, sampling, mastering); for everyday listening, 192 kbps MP3 sounds excellent at a fraction of the size.

Can I extract audio from a video without installing software?

Short answer: Yes. Drop any MP4, MOV or WebM video into the tool, choose MP3 or WAV as the output, and click Convert all. The video track is discarded and only the audio is kept, which is ideal for saving lectures, podcasts and music as audio files. Everything runs locally in your browser.

For spoken-word content like lectures, 128 kbps MP3 keeps files small with no audible loss. For music rips, use 192-320 kbps MP3, or WAV if you plan to edit the track later.

How to use the free audio converter

  1. Drop audio or video files (up to 10) into the dropzone, or click to browse.
  2. Choose an output format: MP3 for universal compatibility, WAV for lossless quality, OGG for efficient open audio, or M4A for Apple devices.
  3. Pick a bitrate: 192 kbps for music, 128 kbps for voice and podcasts, 320 kbps for maximum quality.
  4. Click Convert all. The first run downloads the conversion engine (~30 MB), which is then cached for instant later use.
  5. Download each converted file, or use Download all to save every file at once.

📖 Read the step-by-step guide for this tool

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