For converting a video between aspect ratios to fit a different platform or placement.
Different platforms want different aspect ratios — vertical 9:16 for short-form, square 1:1 for feeds, widescreen 16:9 for players — and a clip in the wrong shape looks letterboxed or pillarboxed. Changing the aspect ratio by cropping reframes the video to fit. This tool does that in your browser, with a zoom control so you choose which part of the frame survives the crop, which is essential when converting between very different shapes. It runs locally, so nothing is uploaded, and the export has no watermark and needs no account. Use it to repurpose one recording across platforms — vertical for Reels/TikTok/Shorts, square for feeds, widescreen for YouTube. Drop in the video, pick the target ratio, frame it, and download. It's the free, private way to change a video's aspect ratio without a desktop editor, and it works on any device with a modern browser.