Crop images to any aspect ratio
Aspect ratio is the relationship between an image's width and its height, written as two numbers such as 1:1 (a perfect square), 4:3 (a classic photo shape), 16:9 (widescreen), 3:2 (the shape of most digital camera photos), or 9:16 (a tall vertical frame). Every platform and device expects a particular shape, and feeding it an image with the wrong ratio means the platform will crop it automatically — often cutting off the exact part you cared about — or pad it with ugly bars. Cropping to the right ratio yourself puts you in control of the framing.
This tool locks the crop box to whichever ratio you choose, so as you drag and resize the selection it always keeps the correct proportions. You simply position the box over the part of the image you want to keep and the rest is trimmed away. Because the box is constrained, you never accidentally end up slightly off-square or a few pixels away from true widescreen, which matters when a platform is strict about dimensions. Once cropped, the image is exported at the pixels inside your selection, ready to upload.
Pixohub performs the crop entirely inside your browser using the HTML Canvas API. The image is drawn to a canvas, the selected region is copied out, and the result is encoded as a PNG. There is no server round-trip, so cropping is instant and completely private — your image never leaves your device. That also means no upload limits and it keeps working even offline once the page has loaded.
Which ratio for which platform
For social media the ratio you pick depends on where the image will appear. A 1:1 square (for example 1080x1080 pixels) is the safe, timeless choice for an Instagram feed post, a profile grid, or a product thumbnail. A 4:5 or 4:3 portrait fills more vertical space in a mobile feed and is popular for Instagram and Facebook posts. A tall 9:16 frame (1080x1920 pixels) is the format for full-screen stories and short vertical video covers on Instagram, TikTok, YouTube Shorts, and Snapchat.
For wider content, 16:9 is the standard widescreen ratio used for YouTube thumbnails and video frames (1280x720 pixels), presentation slides, and desktop wallpapers. A 3:2 crop matches the native shape of most DSLR and mirrorless camera photos and prints cleanly to common sizes like 4x6 inches. A 2:1 or 1.91:1 landscape suits link-preview and banner images on many networks. Facebook and LinkedIn cover images, Twitter/X headers, and email banners each have their own wide shapes, so cropping to a clean ratio first gives you a predictable starting point.
A good rule of thumb is to crop to the ratio the destination expects, then export at a generous pixel size so the platform downscales rather than upscales your image, which keeps it looking sharp. If you are unsure, 1:1 is the most universally accepted shape and 16:9 is the most common for anything video-related. Because the crop box here is locked to the ratio, you get the geometry right the first time and avoid the platform re-cropping your work.