What video formats are supported?

Input: MP4, MOV, WebM, AVI, MKV, MPEG, OGG, M4V, 3GP, and any other format FFmpeg can decode. Output: MP4 (H.264 + AAC), WebM (VP8 + Vorbis), and MOV (H.264 + AAC). MP4 is the most widely compatible output format.

Which quality preset should I choose?

High quality uses CRF 18 (near-lossless) and produces the largest files — ideal for archiving or editing. Medium (CRF 23) is the default and delivers excellent quality at a reasonable size, suitable for most uses. Low (CRF 28) compresses aggressively for sharing or streaming where file size matters more than visual quality.

Tools Video Tools Video Format Converter Video

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Video Format Converter

Convert MOV to MP4, WebM to MP4, or any video format in your browser — no uploads, no account, no software to install. FFmpeg WebAssembly re-encodes everything locally on your device.

Drop a video file here

MOV, MP4, WebM, AVI, MKV — up to 500 MB

Choose file

How It Works

Choose your video

Drop any MOV, MP4, WebM, AVI, or MKV file. The tool automatically suggests the most useful output format. Nothing is transmitted to a server.

Load FFmpeg once

On first use, FFmpeg WebAssembly (~25 MB) downloads to your browser cache. Every subsequent conversion skips this step entirely.

Pick format & quality

Select MP4, WebM, or MOV as the output, then choose High, Medium, or Low quality. FFmpeg re-encodes the video entirely on your device.

Preview and download

Watch your converted video in the built-in player, then download it. No server is ever involved — the file goes straight to your device.

MOV to MP4 Converter — Why Format Matters

MOV is Apple's QuickTime container format — the default output of iPhone cameras, DJI drones, and many Mac applications. While MOV plays perfectly on macOS and iOS, it is not universally supported: Android, Windows, and most social media platforms expect MP4. Converting MOV to MP4 gives you a file that works everywhere without quality loss.

How Browser-Based Video Conversion Works

This tool runs FFmpeg — the industry-standard open-source video processing engine — compiled to WebAssembly directly inside your browser tab. When you click Convert, FFmpeg reads your video from browser memory, re-encodes each frame using the H.264 encoder (for MP4 and MOV) or the VP8 encoder (for WebM), and writes the output back to memory. The download is generated from that in-memory result. At no point does any data leave your device.

Supported Output Formats

MP4 (H.264 + AAC) — The universal standard. Plays natively on every operating system, browser, smartphone, smart TV, and social media platform. Uses the +faststart flag so the video begins playing before it fully downloads. Best choice for sharing, uploading, and general compatibility.
WebM (VP8 + Vorbis) — An open, royalty-free format developed by Google, optimised for web delivery. Produces smaller files than MP4 at comparable quality and is natively supported in Chrome, Firefox, and Edge. Best choice when you are embedding video directly on a web page.
MOV (H.264 + AAC) — Apple's QuickTime container. Useful if you need to hand a file off to a macOS or iOS workflow that specifically requires MOV, or if you are cleaning up a corrupted MOV container while keeping the same codec.

Quality Presets Explained

Quality is controlled by the Constant Rate Factor (CRF) — a perceptual quality setting used by the H.264 and VP8 encoders. Lower CRF values preserve more detail; higher values compress more aggressively.

High (CRF 18) — Near-visually lossless. Recommended for archiving, professional editing pipelines, or any situation where you need to re-edit the output later.
Medium (CRF 23) — The encoder default. Produces excellent visual quality at roughly half the file size of High. Suitable for virtually all everyday uses: sharing, streaming, and uploading.
Low (CRF 28) — Aggressive compression. Noticeably smaller files with some quality reduction, particularly in fast-motion scenes. Best for casual sharing over messaging apps or reducing storage usage.

Privacy & Security

Because all processing happens in your browser, this tool is inherently private. There is no server to store your video, no analytics attached to individual files, and no account to create. The FFmpeg WebAssembly binary is served from unpkg.com (a public CDN for npm packages) and cached by your browser after the first download. Subsequent visits do not re-download it, making conversions instant.

Frequently Asked Questions

Is my video uploaded to a server?

No. All video processing uses FFmpeg WebAssembly running inside your browser tab. Your video bytes are loaded into browser memory only and are never transmitted over the network. The converted output is generated locally and downloaded directly from memory.

Why does it need to download ~25 MB before converting?

The tool uses FFmpeg compiled to WebAssembly, which includes the full H.264 and VP8 video encoder suite. This one-time ~25 MB download is cached by your browser, so every conversion after the first is instant without re-downloading.

What video formats can I convert from?

The tool accepts any format FFmpeg can decode: MP4, MOV, WebM, AVI, MKV, MPEG, OGG, M4V, 3GP, and more. If your video plays in a modern browser or media player, it will work here.

What is the difference between MP4, WebM, and MOV?

MP4 is the universal standard — it plays on every device, browser, and platform. WebM is an open format optimised for web delivery with smaller file sizes. MOV is Apple's QuickTime container, widely supported on macOS and iOS. When in doubt, convert to MP4.

Is this video converter really free?

Yes, completely free. No account required, no watermarks, and no hidden fees. The tool uses open-source FFmpeg compiled to WebAssembly.

Privacy & Security

Your video is processed entirely inside your browser using FFmpeg WebAssembly. No file is ever uploaded to a server, no account is required, and no usage data is linked to your files. The FFmpeg binary is cached locally after the first download — all subsequent conversions run without any network requests.