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Video Converter Online Free — PrivaTools

TL;DR: Upload a video and pick a target container (MP4/MOV/WebM/MKV/AVI) — FFmpeg handles the conversion server-side.

Convert video formats online for free — change between MP4, WebM, MOV, AVI, and MKV with adjustable quality. Powered by FFmpeg, no sign-up required.

Video Converter is one of 179+ free file utilities on PrivaTools. The entire stack is open source under the MIT license, so the privacy guarantees can be audited end-to-end. You can also run all 179 tools on your own infrastructure with one docker compose command.

How to Use Video Converter

  1. Upload a video — MP4, WebM, MOV, AVI, MKV — up to 500 MB.
  2. Choose target format — MP4 (universal), WebM (open, smaller), MOV (Apple), AVI (legacy), MKV (open container).
  3. Download the converted video — FFmpeg transcodes via the appropriate codec (H.264 for MP4, VP9/Opus for WebM, etc.).

Frequently Asked Questions

Which format to choose?

MP4: most compatible. WebM: smaller, used for web embedding. MOV: works in Apple ecosystem and Final Cut. MKV: open-source flexible container.

Will quality suffer?

FFmpeg uses sensible default bitrates that preserve visual quality. For lossless conversion (rare), use the MKV output.

How long does it take?

Roughly real-time on the server (a 2-minute video = ~2 minutes to convert).

Last reviewed 2026-04-25 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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