The right size for every platform
Every platform crops or squashes images that don't match its frame, usually at the worst possible spot. Starting from the exact size it expects keeps control in your hands. The sizes built in:
- YouTube, thumbnails at 1280 × 720 (or 3840 × 2160, the largest YouTube now recommends) and the 2560 × 1440 channel banner.
- Instagram, square posts at 1080 × 1080, portrait posts at 1080 × 1350 (4:5) or 1080 × 1440 (3:4), and stories at 1080 × 1920.
- X, post images at 1600 × 900 and the 1500 × 500 header.
- LinkedIn, post and link images at 1200 × 627 and the 1584 × 396 profile banner.
- Facebook, post and link images at 1200 × 630 and the 851 × 315 page cover.
- Pinterest, 1000 × 1500 pins. TikTok, 1080 × 1920 covers.
Need something else? Choose Custom and type any width and height. Not sure which shape you need? The aspect ratio calculator works it out.
Crop to fill or fit inside?
Crop to fill covers the whole frame and trims what doesn't fit, best for photos. Drag the picture to choose what stays, and zoom in to tighten the framing. Fit inside keeps every pixel and fills the leftover space with a blurred copy of the image or a colour of your choice, which suits screenshots, artwork and anything with text near the edges.
Banner and grid guides
A YouTube channel banner is a 2560 × 1440 image, but only a strip across the middle shows on most screens, and phones show less still. YouTube's guidance puts the safe area for text and logos in the centre: 1546 × 423 on a 2560 × 1440 banner (1235 × 338 at the 2048 × 1152 minimum). The guide marks it, along with the wider strips desktops and tablets show.
Instagram's profile grid shows posts as 3:4 tiles, so a square or 4:5 post loses a little at each side there. The guide shows exactly what the grid keeps; pick the 3:4 size if you want the grid and the post to match.
Sharp results, small files
Shrinking a large photo in one jump makes fine detail shimmer and edges jagged. The resizer halves the image in steps until it's close to the final size, then does the last resize at high quality, the same approach photo editors use. Only the part of the picture that will be visible is processed, so even large photos resize quickly.
JPG is the safe choice for photos. PNG keeps text and flat graphics crisp and supports transparency. WebP usually gives the smallest file, but not every platform accepts it for uploads, so use JPG or PNG when in doubt. The size estimate updates as you change the quality slider, so you can hit an upload limit without guessing.
Making a thumbnail from a video
Grab the sharpest frame with the frame grabber, size it here to 1280 × 720, then see how it holds up next to other videos in the Thumbnail Tester. For vertical covers, the safe zone checker shows what the buttons and captions will hide.