Free tool · runs in your browser

Video Format Converter

Convert any video between the five most common containers — MP4, MOV, WebM, MKV, and AVI — entirely in your browser. Pick the output format and a High/Medium/Low quality preset (CRF 18/23/28); your file never touches a server.

How to use this tool

  1. 01

    Upload your video

    Any input format FFmpeg can decode — it stays in your browser.

  2. 02

    Pick output format

    Match your downstream use: MP4 for delivery, MOV for editing, MKV for archival, WebM for the open web, AVI for legacy.

  3. 03

    Pick quality preset

    High for archival, medium for delivery, low for fast and small (CRF 18/23/28).

  4. 04

    Convert and download

    Allow time for re-encoding — every frame is decoded and recompressed locally.

Why this matters

Different platforms and editors expect different containers — Final Cut wants MOV, the open web wants WebM, almost everything plays MP4 — and converting on someone else's server adds upload time, a queue, watermarks, and a privacy risk for unreleased footage.

This converts locally with sensible codec defaults per container and a single quality dial, so you don't have to memorize encoder flags. Note that changing format always re-encodes (a small quality loss); if you only need a lossless container swap with the same codecs, the Video Trimmer's stream-copy mode is the better tool.

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FAQ

Choose MP4 for delivery — it plays on virtually every device, browser, and platform without question. Choose MOV when handing footage to an editor (Final Cut and Premiere treat it as a first-class edit format). Choose MKV for archival: it's the most flexible container, holding multiple audio tracks, subtitle tracks, and chapters in one file.

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