First time may take a moment
Drop video here or click to upload
Supports MP4, WebM, MOV, AVI | Max 500MB
0%
Processing video...
0 MB
0 MB
Videos are converted entirely in your browser. Nothing is uploaded to any server.
Uses FFmpeg.wasm for native-speed video processing in browser.
Convert between MP4, WebM, MOV with H.264 encoder support.
See original vs converted file size at a glance.
Use Video Convert when the main problem is compatibility: social uploads, browser playback, CMS delivery, or device support. If the converted file is still too large, continue with Video Compress. If you need a looping excerpt after converting, continue with Video to GIF. For the broader media workflow, jump to the Image Tools hub.
No-upload workflow: source videos, client review clips, and private browser-playback fixes stay on your device while conversion runs locally.
Convert video format online free with FreeToolBox — transform MP4, MOV, WebM, AVI, MKV, and other video files between formats right in your browser using FFmpeg.wasm. Different platforms have different requirements: Twitter and YouTube prefer MP4 (H.264), web browsers natively play WebM (VP9), and older devices may need AVI. Choose the right output codec for your target platform.
All conversion runs locally in your browser using WebAssembly — your video files are never sent to any server. Privacy is guaranteed. The output video has no watermarks. Completely free, no account required.
MP4 with H.264 codec is the universal standard — compatible with virtually every browser, device, and platform. For modern browsers, WebM with VP9 offers better compression. HEVC/AV1 give the best compression but have limited support.
Re-encoding between lossy formats always involves some quality loss. Converting from a high-quality source keeps the loss imperceptible. Converting lossy-to-lossy multiple times compounds quality loss (generation loss).
No. FFmpeg.wasm converts your video entirely within the browser. Your file stays on your device throughout.
Video encoding is computationally intensive. FFmpeg.wasm runs in a browser thread without GPU acceleration. Shorter clips or lower resolution settings convert faster.
Video files are described by two separate things, and it is worth knowing which one you are changing. The container — MP4, MOV, WebM, MKV — is the wrapper that holds the tracks. The codec — H.264, H.265, VP9 — is how the frames are actually compressed. This tool outputs MP4 with H.264, the single most compatible combination, which plays almost everywhere. If your goal is compatibility, converting to that is usually the right move; if your goal is maximum compression, you would be choosing a codec trade-off instead.
Converting a video is genuinely useful when the destination requires a different format — an older device, a specific platform, a browser that does not play the original. It is also useful to normalize a file that was recorded in a container your tools can't handle. What conversion does not do is magically shrink an already-compressed clip or improve quality that was never there. Converting a low-quality source to a higher bitrate does not add detail. If the goal is smaller size, compression is the right tool; if the goal is compatibility, conversion is.
Every conversion that re-encodes the video degrades it slightly and takes real time, because frames must be decoded and recompressed. A format that can be remuxed — the codec stays the same and only the container changes — is nearly instant and lossless, but that only applies when the target supports the same codec. For a genuine codec change, expect longer processing and a small quality cost. Use a good-quality source, set a sensible target, and keep the original file until the converted version is verified in the place it will actually be used.