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100% Client-Side Private • Fast Video Converter

Video Format Converter

Convert video files between MP4, WebM, AVI, MOV, MKV, WMV, and FLV directly in your browser using FFmpeg WebAssembly. 100% private.

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Quick Answer

How do I convert WebM to MP4 without uploading?

Upload your WebM file to ToolJi's Video Format Converter. It uses browser FFmpeg WebAssembly to convert WebM to MP4 100% locally on your computer.

What is Video Format Converter?

A Video Format Converter transcodes video containers and video codecs (such as WebM, MOV, AVI, MKV) into universally compatible formats like MP4.

Who Needs It?

Content creators, video editors, teachers, and mobile users needing to convert unsupported video recordings for playback on TVs, smartphones, or web portals.

Problem Solved

Fixes 'Video format not supported' playback errors on iPhone, Android, QuickTime, and Windows Media Player.

How to Convert Video Files Online

  1. 1

    Upload Video

    Select an MP4, WebM, MOV, AVI, MKV, or WMV video clip.

  2. 2

    Choose Output Format

    Select your desired target container (MP4, WebM, AVI, MOV).

  3. 3

    Adjust Quality

    Select resolution preset (1080p, 720p, 480p) and video quality.

  4. 4

    Convert & Download

    Click Convert Video and save your transcoded video file.

Common Uses for Video Format Converter

Converting iPhone MOV recordings to MP4 for editing on Windows PCs.

Converting WebM browser screen recordings to MP4 for social media uploads.

Transcoding AVI or MKV movie clips for playback on smart TVs.

Converting video clips for web application compatibility.

People Also Search For

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Frequently Asked Questions

Is my video file uploaded to any server?

No. Video transcoding executes inside your browser using WebAssembly technology.

What video formats are supported?

Supports MP4, WebM, MOV, AVI, MKV, WMV, FLV, 3GP, and TS video files.