What is the Video to MP3 Converter?
The Video to MP3 Converter by WorldOfTools extracts audio tracks from MP4, WebM, and MOV video files entirely in your browser. Use it to save a podcast audio from a recorded webinar, extract music from a video, save a speech or lecture as MP3, or create ringtones from video clips — all without installing software.
This tool uses the Web Audio API and MediaRecorder API built into modern browsers. Your video file is processed locally and never uploaded to any server.
Frequently Asked Questions
How do I convert MP4 to MP3 online for free?
Upload your MP4 file using the zone above, optionally set start and end times, choose your quality, and click Extract Audio. The audio is generated in your browser and you can download it immediately — no login required.
Is my video uploaded to any server?
No. This tool uses the Web Audio API and MediaRecorder API entirely in your browser. Your video file never leaves your device and is never stored anywhere.
What video formats are supported?
The tool supports MP4, WebM, MOV, OGG, and AVI video files. MP4 is the most universally supported format across all browsers.
What audio quality options are available?
You can choose from 64 kbps (compact, ideal for voice), 128 kbps (standard, balanced), 192 kbps (high quality music), and 256 kbps (near-lossless). For podcasts and voice, 128 kbps is sufficient. For music, use 192–256 kbps.
Can I trim the audio during conversion?
Yes. Set a start time and end time in the settings before extracting to get only the portion of the audio you need. You can also use the "Use Current Time" button to set the start from the video playhead position.
Why can't I hear audio in the extracted file?
This can happen if the video file has no audio track, or if the browser's MediaRecorder doesn't support the selected format. Try switching the output format to WebM or OGG, which have broader MediaRecorder support.