Resize Image Online — Free, Fast & Private
Whether you need to resize photos for a website, social media, email, or document upload, MiniPx makes it fast and simple. Set a maximum width and MiniPx automatically scales the image proportionally — no distortion, no cropping, aspect ratio always preserved.
MiniPx offers four preset max widths: 1920px (full HD, ideal for websites and presentations), 1280px (great for email, social media, and general sharing), 800px (compact, ideal for form uploads and government portals) and 640px (thumbnails). The height follows from the aspect ratio; for an exact width-and-height box, crop afterwards. You can also combine resizing with format conversion and compression in one step. Note that resizing only goes downward — it removes pixels. When an image needs to get bigger, stretching it here would pixelate; the AI image enlarger synthesises the new pixels instead. The format you are holding changes what resizing costs, too: resize a PNG and the output re-encodes losslessly with transparency intact, while to resize a JPG is to choose a re-encode quality as well — each page covers its format's specifics.
For web developers, resizing oversized images is one of the most impactful performance optimisations. A 4000px wide photo displayed at 800px on your website wastes bandwidth on pixels that are never seen. Resizing to the actual display dimensions can reduce file size by 80% or more.
For social media, each platform has recommended dimensions: Instagram (1080px), Facebook (1200px), Twitter/X (1200px), LinkedIn (1200px). Setting max width to 1280px produces images that look sharp on all these platforms while keeping file sizes manageable. For the exact header and in-stream shapes X uses, resize for X/Twitter on its own page.
All resizing happens in your browser. Your images are never uploaded to any server, making MiniPx safe for confidential documents, personal photos, and professional images.