Free Online Video Format Converter
Convert video between MP4, WebM, MOV, AVI and MKV formats entirely in your browser. Choose your output quality and let FFmpeg.wasm handle the rest. No uploads, no account, completely free.
Drop your video here or click to browse
MP4, WebM, MOV, AVI, MKV — convert to any supported formatHow to convert video format online
Frequently asked questions
Which format should I choose?
MP4 is the safest choice — it plays on every device, browser, phone, TV, and social platform. WebM is best for embedding video on websites (smaller files, great browser support). MOV is for Apple devices and Final Cut Pro. MKV is a flexible open container that supports subtitles and multiple audio tracks. AVI is a legacy Windows format — only use it if specifically required.
Will converting change the video quality?
Format conversion always involves re-encoding, which means some quality loss compared to the original. At "Balanced" quality (CRF 23) the difference is minimal and hard to spot. At "High quality" (CRF 18) the output is very close to the original. Avoid converting the same video multiple times as quality loss compounds.
Why is processing slower than trim or mute?
Trim and mute use stream copy — they don’t re-encode the video, just copy it. Format conversion requires full re-encoding of every frame, which is much more computationally intensive. Processing time scales with video length and resolution.
Is my video uploaded to a server?
No — everything runs locally using WebAssembly (FFmpeg.wasm). Your video never leaves your device.
Can I convert audio-only formats?
This tool is for video conversion. To extract just the audio as MP3 or WAV, use our Audio Extractor tool.
