VidsKit

The Converter

Convert up to five videos to MP4 or WebM. Private and free; nothing is uploaded.

1 · Choose your videos

Drag & drop videos here, or click to browse

Up to 5 videos, max 200 MB each · MP4, WebM, MOV, MKV, AVI…

    2 · Pick a format

    The video engine (~31 MB) downloads on first use and is then cached by your browser. All processing runs on your own device; nothing is uploaded.

    3 · Collect your videos

    Results appear here with a preview. Download them one by one or grab everything as a ZIP.

    Convert a video

    How to convert a video online

    1. Drop up to 5 videos into the box above, or click it to browse your files.
    2. Choose the output format: MP4 or WebM.
    3. Click Convert videos. The engine loads once, then each video is re-encoded on your device.
    4. Download each result or grab them all as a ZIP.

    Frequently asked questions

    Which formats can I convert?

    You can load MP4, WebM, MOV, MKV, AVI, MPEG, 3GP, OGV and most other common video files, and convert them to MP4 (H.264 + AAC) or WebM (VP8 + Vorbis).

    Will converting reduce quality?

    Conversion re-encodes the video, so a small amount of quality is traded for compatibility. The settings are tuned so the difference is rarely visible.

    Why choose MP4?

    MP4 with H.264 video and AAC audio is the most widely supported video format in the world. If a device can play video, it can play MP4.

    Is the converter really private?

    Yes. The conversion runs entirely in your browser with ffmpeg compiled to WebAssembly. Your videos are never uploaded to any server.

    How do I convert an iPhone MOV video to MP4?

    Drop the .mov file in, keep MP4 selected, and click convert. The result plays on Windows, Android, and every website, with nothing uploaded anywhere.

    Can I convert MKV to MP4 without uploading it to a server?

    Yes, that is the whole point of VidsKit: the conversion runs in your browser, so even large MKV files never leave your device. Files up to 200 MB are supported.

    What format works best for WhatsApp, Instagram, and TikTok?

    MP4 with H.264 video and AAC audio, exactly what the converter produces. Every social and messaging app accepts it without complaints.

    More free tools: Trim · Compress · To GIF · Extract audio · Mute · Resize