Social Media Image Resizer

How to resize an image

1. Choose an image or drop it onto the box.
2. Pick a size from the list, or type your own width and height.
3. Choose Crop to fill to fill the frame (drag the preview to choose what stays in), or Fit with background to keep the whole image and fill the gaps with a colour.
4. Pick a format, select Resize, then download.

Image sizes included

Sizes marked “official” are stated by the platform. “Common” sizes match a documented aspect ratio, but the platform page we checked didn't give the exact pixels. Last checked 25 October 2026.

Which format should I use?

• JPG for photos and thumbnails: small files, and YouTube and Instagram both accept it.
• PNG for graphics with sharp text or flat colour, or when you need transparency (Fit mode fills the background, so pick JPG there unless you need lossless quality).
• WebP for websites: smaller than JPG at similar quality. Not every platform accepts WebP uploads, so check before using it.

Privacy and limits

Resizing happens with your browser's built-in canvas, so the image is never uploaded. Very large images use a lot of memory, so files are limited to 40 MB and about 80 megapixels. Animated GIFs export as a single still frame. HEIC photos from iPhones only open in browsers that support HEIC, mainly Safari.

Crop to fill or fit?

Crop to fill fills the whole frame and trims whatever doesn't fit, which is best for photos where the subject is centred. Fit keeps the whole image and adds background bars, which is better for screenshots, logos and anything where cutting off an edge would lose information.

Worked example: one photo, three platforms

Start with a 4000 × 3000 (4:3) photo. For a YouTube thumbnail at 1280 × 720 (16:9), cropping removes a strip from the top and bottom. For an Instagram portrait post at 1080 × 1350 (4:5), cropping removes the sides instead. For a 1080 × 1920 story (9:16), more of the sides go, so check that faces stay in frame or switch to fit mode.

Quality and file size

JPG is best for photos and gives the smallest files; PNG keeps sharp edges on text and graphics; WebP is smaller still but not accepted everywhere. If a file is too big for an upload limit (YouTube thumbnails must be under 2 MB from mobile), lower the JPG quality a little. The difference is rarely visible on screen.

See the YouTube thumbnail size guide for current official sizes.

Frequently asked questions