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Video Converter

Convert videos between MP4, WebM, MOV and GIF in your browser — no upload, with quality and size options.

🔒 Your video is processed locally in your browser. Your file is never uploaded.

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You may also need

  • MP4 to WebM Converter — Convert MP4 videos to WebM (VP8/Opus) for websites and HTML5 video, right in your browser.
  • WebM to MP4 Converter — Convert WebM screen recordings and web videos to MP4 that plays on iPhone, Windows and editors.
  • MOV to MP4 Converter — Convert iPhone and QuickTime MOV videos to MP4 — usually in seconds, without losing quality.
  • Video Resizer — Change video resolution or aspect ratio — 1080p, 720p, square 1:1 or vertical 9:16 for Reels, TikTok and Shorts.

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How to use the Video Converter

  1. Choose a video (or drop it on the box). The format and length are detected automatically.
  2. Pick the output format, quality and resolution.
  3. Click "Convert", wait for the progress bar and download the result.

Common use cases

  • Turn an iPhone MOV into an MP4 that plays everywhere
  • Make a WebM for a website background video
  • Re-save an MKV or AVI so phones and editors can open it

Example

A 40-second 1080p MOV from an iPhone (H.264) becomes an MP4 in a few seconds with "Fast" copy mode, because only the container changes.

What the Video Converter does

It changes a video's format (container) and, when needed, its codec. MP4 with H.264 plays on practically every phone, TV, browser and editor. WebM is the open format for websites. MOV is Apple's QuickTime container, and GIF makes a silent looping animation. Any format FFmpeg can read works as input, including MKV, AVI, WMV, FLV, 3GP and MTS.

Fast mode copies the audio and video streams into the new container without re-encoding. It takes seconds, loses no quality, and works when the codecs already fit, such as an iPhone H.264 MOV to MP4. Otherwise the video is re-encoded in your browser with the quality you pick. A lower resolution makes both the job and the file much smaller.

Frequently Asked Questions (FAQ)

Q: Is my file uploaded to a server?
A: No. The tool runs FFmpeg compiled to WebAssembly inside your browser tab. Your file is read directly from your device and the result is created locally. Only the video engine itself (open-source ffmpeg.wasm, about 10 MB compressed) is downloaded the first time, from a public CDN; after that it is cached.
Q: How big can the file be?
A: Up to about 500 MB works well on a computer and about 150 MB on a phone. Larger files may still work but can be slow or run out of browser memory. Trimming the clip or lowering the resolution first helps.
Q: Why is it slower than a desktop app?
A: The browser version of FFmpeg runs on a single CPU core and without hardware acceleration. A 1-minute 1080p re-encode typically takes 1–3 minutes. When possible the tools copy the streams without re-encoding, which takes only seconds.
Q: Why did "Fast" re-encode my video anyway?
A: Stream copy only works when the codecs are allowed in the target format. For example, a VP9 WebM can't go into an MP4 without re-encoding. The tool detects this and re-encodes automatically.