Zolkit

Video Converter

Convert MP4, MOV, AVI, MKV, WebM and more directly in your browser. Your videos stay on your device.

Drop a video here

or click to choose a file

MP4, MOV, AVI, MKV, WebM, WMV, MPG, VOB, TS, FLV, 3GP, HEVC and GIF

Conversion settings

Popular conversions

MOV to MP4 ConverterMKV to MP4 ConverterWebM to MP4 ConverterAVI to MP4 ConverterMP4 to GIF ConverterGIF to MP4 ConverterMP4 to MOV ConverterMP4 to WebM ConverterWMV to MP4 ConverterMPG to MP4 ConverterVOB to MP4 ConverterHEVC to MP4 ConverterM4V to MP4 ConverterTS to MP4 ConverterFLV to MP4 Converter3GP to MP4 ConverterMP4 to AVI ConverterMP4 to MKV ConverterMOV to GIF ConverterWebM to GIF Converter

Free Video Converter for MP4, MOV, MKV, WebM and More

Zolkit's Video Converter changes video formats entirely inside your browser. Convert MOV to MP4, MKV to MP4, WebM to MP4, AVI to MP4, MP4 to WebM, video to GIF, and other common combinations without uploading the source to a server. FFmpeg WebAssembly uses your device's processor for private local conversion, while quality, resolution, and encoding controls let you choose between speed and file size.

Local and private

Video bytes stay on your device; conversion runs inside the browser tab with no media upload.

Fast encoding mode

The default fast preset uses more of your browser's available CPU to finish common conversions sooner.

Nine output formats

Export MP4, MOV, AVI, MKV, WebM, WMV, MPG, FLV, or an animated GIF from one converter.

Quality controls

Choose high quality, balanced output, or a smaller file and optionally cap resolution at 1080p, 720p, or 480p.

Preview before saving

Play compatible results or preview an animated GIF before downloading the converted file.

Free without watermarks

Convert videos without an account, subscription, queue, watermark, or server-side file limit.

How to Convert a Video Format

  1. 1

    Drop a video onto the converter or click the upload area to choose MP4, MOV, AVI, MKV, WebM, WMV, MPG, VOB, TS, FLV, 3GP, HEVC, or GIF.

  2. 2

    Choose an output format, quality, maximum resolution, and encoding mode. Fast and balanced settings work well for most videos.

  3. 3

    Select Convert, keep the tab open while your browser processes the file, then preview and download the result.

Video Converter FAQ

How can I convert MOV to MP4 for free?

Upload the MOV file, select MP4, and start conversion. Zolkit encodes the video as H.264 with AAC audio for broad compatibility, and processing happens locally without uploading the MOV file.

Can I convert MKV or WebM to MP4 online without uploading?

Yes. Zolkit reads MKV and WebM files with FFmpeg WebAssembly inside the browser and creates an MP4 on the same device. Only the conversion engine is downloaded; the video is not sent to a media server.

Which video format should I choose?

Choose MP4 for phones, messaging, presentations, and the widest playback support. Choose WebM for websites, MOV for Apple or editing workflows, MKV for a flexible archive container, and GIF only for short silent loops.

Why does browser video conversion take time?

Changing codecs requires decoding and re-encoding every frame on your device. Duration, resolution, codec, quality, and CPU speed affect the conversion time; selecting Fast or a lower maximum resolution usually finishes sooner.

Is there a video file size limit?

Zolkit does not impose an upload limit because files are never uploaded. The practical limit is the memory available to the browser, so desktop browsers generally handle large videos better than phones.

Does video conversion reduce quality?

Most format changes re-encode the video and can introduce some loss. High Quality minimizes visible loss, Balanced is the recommended default, and Smaller File uses stronger compression. Converting to GIF removes audio and usually reduces color detail.