Resize an image online — Instagram and YouTube sizes
Every feed crops differently. A landscape photo becomes a vertical Story, a square post becomes a link preview, and a screenshot needs exact pixels for an app store. Choose a platform preset or type your own size, then crop to fill the frame or pad the whole image onto a background.
From file to download, with no upload bar
- 01Load the image
Drop a JPG, PNG, WebP, HEIC, AVIF, GIF, BMP, or SVG file. Cutmoor shows the source dimensions.
- 02Pick a preset or exact size
Choose Instagram post, square, Story, YouTube thumbnail, link preview, X post, LinkedIn, or an app icon. Custom accepts any size up to the canvas limit.
- 03Crop or pad
Crop to fill keeps the centre and trims the edges. Pad to fit keeps the whole image and adds a background colour or transparency.
- 04Export
Choose JPG, PNG, or WebP, set the quality, and download the resized image from your device.
Resize image: common questions
What is the best Instagram image size?
Use 1080 × 1350 for a portrait feed post (4:5), 1080 × 1080 for a square post, and 1080 × 1920 for a Story or Reel cover (9:16). Instagram compresses uploads again, so start from a sharp source and avoid upscaling a small image.
What size should a YouTube thumbnail be?
YouTube recommends 1280 × 720 (16:9), at least 1280 px wide, and under 2 MB. The preset in Cutmoor uses those exact dimensions. Keep important text away from the bottom-right corner, where the duration badge sits.
What does crop to fill mean?
Crop scales the image until it covers the whole frame, then trims the overflow from the centre. Nothing is stretched. If the subject is near an edge, check the preview: a centre crop can cut it off. Pad is the safer choice for screenshots and diagrams.
Does resizing up add detail?
No. Upscaling interpolates existing pixels and can look soft. Use the largest source you have and resize down to the final dimensions. For print or a large banner, start from a higher-resolution original rather than enlarging a small file.
Can I resize an image without losing transparency?
Yes. Choose PNG, or WebP in a browser that can encode it. With Pad selected, enable transparent padding. JPG has no alpha channel, so transparent areas are filled with the background colour you choose.