How do you use this tool?
- Drag and drop your video file onto the drop zone, or click to browse and select a file.
- Choose the output format — MP4, WebM, GIF or animated WebP.
- For GIF output, optionally adjust framerate, palette size and dithering in the accordion.
- Click 'Convert' and wait — progress is shown in real time.
- Download the converted file using the 'Download converted video' button.
What does this converter do?
This video format converter transforms video files directly in your browser — completely locally, with no server upload, no sign-up required. It accepts MP4, WebM, GIF, MKV, AVI and MOV as input and outputs MP4, WebM, GIF or animated WebP.
Three use cases make this tool particularly relevant: MP4 to WebM for web developers optimising CDN costs and load times; GIF to MP4 for website owners improving their Core Web Vitals; and video to GIF for chat platforms that do not accept video files.
Processing happens entirely in the browser via a proven open-source library. No video ever leaves your device.
Why browser-only conversion?
Traditional online converters upload your file to a remote server. That is a privacy concern for personal videos, business recordings or confidential content. Most also cap at 100–200 MB or ten conversions per day.
This converter has no such limits. Everything happens locally: the file stays on your device, no data is transferred, no waiting for server capacity.
How do MP4, WebM, GIF and WebP compare?
| Format | Typical size | Compatibility | Best use |
|---|---|---|---|
| MP4 (H.264) | Reference | Universal | All devices, maximum compatibility |
| WebM (VP9) | −30–40\u00a0% | All modern browsers | Web embedding, CDN optimisation |
| GIF | +500–1000\u00a0% | Universal | Chat platforms, short loops |
| Animated WebP | −60–70\u00a0% vs. GIF | Modern browsers | Websites, Discord, Slack |
Which GIF quality options are available?
GIF supports a maximum of 256 colours — this is a hard technical limit. The converter therefore uses a 2-pass pipeline: in the first pass it analyses the most frequent colours in the video and builds an optimised palette. In the second pass it renders the GIF using that palette.
Additional options are available:
- Framerate: 5, 10, 15 or 25 frames per second. Lower values produce smaller files; higher values look smoother.
- Colour palette: 64, 128 or 256 colours. More colours means better quality and larger files.
- Output width: 240, 480 or original width. Narrower GIFs are considerably smaller.
- Dithering: Auto (best quality, sierra2_4a algorithm), Fast (Bayer dithering) or None.
How does GIF to MP4 improve Core Web Vitals?
GIFs on websites are a recognised performance anti-pattern. A 20\u00a0MB GIF banner can delay the Largest Contentful Paint (LCP) by several seconds — and Google weights LCP in its search ranking.
Converted to MP4, the same GIF typically shrinks to 1–2\u00a0MB. The <video autoplay loop muted playsinline> element replaces the <img> tag and Google indexes it correctly. The result: faster load time, better LCP score, potentially improved ranking.
Frequently Asked Questions
(FAQ is rendered from frontmatter as FAQPage schema.)
Which Video Tools Are Related?
More tools from the converter ecosystem on the same topic:
- Compress video — Reduce MP4 file size without changing format.
- Video to audio — Extract the audio track from MP4, WebM or MKV as MP3 or WAV.
- HEVC to H.264 — Convert H.265 videos to the universally compatible H.264 format.
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