Resizing Images for Web, Email, and Social Media Without Losing Quality
Resize an image to match its actual display size at the destination — a web page rarely needs an image wider than about 1,200–2,000 pixels, email attachments benefit from staying under a few hundred KB per image, and social platforms have their own recommended dimensions that avoid an extra, uncontrolled resize by the platform itself.
An image resized to roughly match where it's actually going to be displayed avoids both unnecessary file size and the platform's own automatic (often lower-quality) resizing.
Web use
Most web page layouts don't display an image wider than 1,200–2,000 pixels, even on a large monitor — uploading a much larger original just adds page load time with no visible benefit. Resizing down to match the actual maximum display width keeps quality while meaningfully reducing file size.
Email attachments
Large, unresized photos are one of the most common causes of a slow-to-load or bounced email — resizing images down to a few hundred KB each before attaching keeps an email light and fast to send and receive, without a visibly noticeable quality loss for typical viewing.
Social media
Most platforms automatically resize and recompress uploaded images to their own preferred dimensions — uploading an image close to that platform's recommended size, rather than a much larger original, gives more control over the final quality than letting the platform's own automatic compression handle a mismatched size.