QuickFileKit
No video upload
The source and generated result remain on your device.
Video to MP3
Extract MP3 audio from a video. The video engine runs on your device, so the source file never leaves your browser.
Drop a video here
MP4, MOV, or WebM · up to 100 MB and 10 minutes
Your files stay on your device.Private by design — this tool processes files locally in your browser.
Found a problem or have an idea?
Send a short report and receive a tracking code. Do not include passwords, private files, or personal information.
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How to use it
- Choose or drop an MP4, MOV, or WebM video.
- Adjust the available options and time range.
- Process locally, preview the result, and download it.
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Why use this tool?
Mobile-aware
The interface adapts to phones and uses safety limits to reduce memory pressure.
No external API
QuickFileKit self-hosts the WebAssembly engine and loads it only when processing begins.
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Related tools
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Frequently asked questions
Does Video to MP3 upload my video?
No. Reading, transcoding, and output generation all happen in your browser.
Why is the first run slower?
Your browser downloads the roughly 32 MB local video engine once. Later runs may reuse cached data.
Are there limits?
Videos are limited to 100 MB and 10 minutes. GIF clips are limited to 30 seconds to reduce browser crashes, especially on phones.