Video Tools
Video to MP4 Converter
Convert any video format to MP4 (H.264 + AAC) with quality controls.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Drop a video file or click to upload
MP4, WebM, MOV, AVI, MKV, FLV, WMV
Your videos are processed locally. Nothing is uploaded.
What is the best free video to MP4 converter?
OptiPix Video to MP4 Converter converts MOV, WebM, AVI, and MKV to MP4 (H.264 + AAC) using FFmpeg WebAssembly locally in your browser. Unlike CloudConvert or FreeConvert, there is no file-size cap, no daily limit, and the video never uploads to a server.
Embed this tool on your website
Copy this code to add the Video to MP4 Converter to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/video-to-mp4" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Video to MP4 Converter by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/video-to-mp4">OptiPix Video to MP4 Converter</a></p>
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About Video to MP4 Converter
Last updated: May 2026
OptiPix Video to MP4 Converter transforms any video format to universally compatible MP4 (H.264 video + AAC audio). Upload MOV, WebM, AVI, MKV, FLV, or WMV files. Choose quality presets (High, Standard, Low) or set custom CRF values. Resolution control from 4K to 480p. Uses FFmpeg.wasm for professional encoding.
How It Works
FFmpeg.wasm encodes with -c:v libx264 -crf {quality} -preset medium -c:a aac for universal MP4 output.
Use Cases
- •Convert MOV from iPhone to MP4
- •Convert WebM to MP4 for sharing
- •Convert AVI for modern players
- •Compress video while converting
- •Ensure compatibility across devices
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If you find Video to MP4 Converter useful, check out these related tools: Video Trimmer, Video Resizer, and Video Compressor. All tools run entirely in your browser with no uploads or signups required.
Explore more: Browse all tools · Step-by-step guides · Tips & tutorials · Compare tools
OptiPix Video to MP4 Converter vs CloudConvert vs FreeConvert vs Convertio
| Feature | OptiPix | CloudConvert | FreeConvert | Convertio |
|---|---|---|---|---|
| Video uploaded to a server | Never | Yes | Yes | Yes |
| Free limits | Browser memory only | 25/day | 1GB free | 100MB free |
| Input formats | MOV, AVI, MKV, WebM, more | Very broad | Broad | Broad |
| Wait time | No upload/queue | Upload + queue | Upload + queue | Upload + queue |
| Watermark | None | None | None free tier varies | None |
Competitor details reflect publicly listed free-tier features and may change.
Container vs codec: what conversion actually does
Many 'conversions' to MP4 don't need to re-encode anything. A .MOV from an iPhone and a .MP4 usually both contain H.264 video - they differ only in container. OptiPix detects this and performs a stream copy (remux), rewriting the container in seconds with zero quality loss.
When the source codec genuinely isn't MP4-compatible (MKV with VP9, old AVIs with DivX), FFmpeg.wasm re-encodes to H.264 + AAC locally - the most universally playable combination, supported by every browser, phone, TV, and editing tool made in the last decade.
Local processing means conversion speed depends on your CPU, not your upload bandwidth - and footage never sits on a third-party server. A 1GB screen recording converts without transferring a byte, which cloud converters' free tiers won't even accept.
Frequently Asked Questions
Input formats?
Quality presets?
Resolution?
Uploaded?
Codec?
Why won't my MOV file play on Windows?
Does converting to MP4 lose quality?
What's the difference between MP4 and MKV?
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