The right image size for every platform
Most upload failures and washed-out thumbnails come down to one thing: a mismatch between your image's dimensions and the platform's expected size. This tool lets you resize to exact pixel targets — or to a percentage of the original — in one click. Below is a quick reference for the sizes that come up most often.
Social media
- Instagram square post: 1080 × 1080 px
- Instagram portrait: 1080 × 1350 px
- Instagram story / reel: 1080 × 1920 px
- Facebook cover: 820 × 312 px (851 × 315 also works)
- Twitter / X header: 1500 × 500 px
- LinkedIn banner: 1584 × 396 px
- YouTube thumbnail: 1280 × 720 px
- Pinterest pin: 1000 × 1500 px (2:3 ratio)
Web and display
- Full HD wallpaper: 1920 × 1080 px
- HD wallpaper: 1280 × 720 px
- 4K wallpaper: 3840 × 2160 px
- Email header: 600 × 200 px (rendered well by most clients)
- Open Graph / social share image: 1200 × 630 px
- Favicon master file: 512 × 512 px
Print sizes depend on the target DPI. For 300 DPI (high-quality print) a standard 4 × 6 inch photo is 1200 × 1800 px, a US Letter page is 2550 × 3300 px, and a 5 × 7 print is 1500 × 2100 px. If you're not sure, aim for the largest size your source image supports — you can always shrink later, but upscaling beyond the original adds blur and artefacts.
How resizing works
Behind the scenes the tool draws your image onto an HTML canvas at the new dimensions using bicubic-style interpolation, then re-encodes it as JPG, PNG or WebP. Bilinear and bicubic resampling produce the smooth, modern look you expect — without the blocky pixelation you'd get from nearest-neighbour scaling. Because everything happens in the browser, your files are never uploaded; the tool works just as well offline once the page has loaded.
Locking the aspect ratio
By default the width and height inputs are linked: change one and the other updates automatically to preserve the original image's proportions. Click the chain icon between the two inputs to break the link if you need to stretch or squash the image — useful when forcing a specific banner shape, or filling a UI slot with a fixed aspect ratio.
Resizing in bulk
When you have a folder of product photos or screenshots that all need to hit the same target size, switch to Bulk mode. Drop up to 20 files, pick your dimensions (or a percentage scale), and the tool will process them one after another. At the end you'll get a single ZIP archive containing every resized image, named so the new dimensions are visible at a glance.