Image Resizerfor Social Media

Crop fills the whole frame and cuts off whatever doesn't fit. It's best for photos, where a full-bleed image looks cleaner. Use the focus setting to keep the important part: top for portraits with faces near the top, centre for most things.

Fit shrinks the whole image so nothing is cut, and fills the empty space with a colour. It's best for screenshots, artwork, quotes and logos, where losing an edge would ruin it. A background that matches the image's own edges looks the most natural.

JPEG is smaller and right for photos. A quality of 85 to 92 looks the same as the original to most eyes at a fraction of the size. PNG keeps every pixel exactly, which suits screenshots, text and graphics with flat colour, but files are bigger.

Social apps recompress what you upload either way. Sending a clean, correctly sized file gives their compression less to work with, which usually means a sharper result.

This resizer uses your browser's built-in canvas to do the work. The image is read from your device, drawn at the new size and saved back to it. Nothing is sent to a server, there's no account, and closing the tab clears it.

Shrinking an image keeps it sharp, but enlarging one can't add detail that wasn't there. If your source is smaller than the size you pick, expect some softness.

• Start from the biggest version of the photo you have.
• Resize once from the original rather than resizing a resized copy.
• For thumbnails with text, check the result at a small size, the way people will see it.
• Keep a copy of the original. Each JPEG save loses a little detail, so always go back to the source for the next size.