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Amazon wants 1,600 to 2,000 pixels square with a pure white background. Shopify wants 2,048 by 2,048. Etsy wants a 4:3 landscape crop. Here are the exact specs for every major platform and how to build one workflow that covers all of them without reshooting anything.

JPEG, PNG, WebP, AVIF, GIF, SVG, HEIC, TIFF, BMP, and JPEG XL, covered in one place. Real file size data, where each format wins, where it loses, and exactly which converter to use for every situation.

WebP lossless compresses 23 to 42% better than PNG according to Google's own published study, with the same transparency and zero pixel loss. Here is the real comparison: where WebP wins, where PNG still earns its place, and how to convert without breaking anything.

HEIC photos from your iPhone will not open on Windows, will not upload to most portals, and break in older software. Here is why HEIC exists, what happens to quality during conversion, and how to convert in seconds with no upload.

Most resize tools crop your image to force a new aspect ratio, cutting off whatever does not fit. Here are the three real ways to resize without losing any content: letterboxing, background extension, and proportional resizing, and which one to use for product photos, screenshots, and social media.

WebP does not work in email clients, government portals, print workflows, or legacy software. Here is why you need to convert, what happens to quality, the right JPEG quality setting, and how to do it in seconds with no upload.

WhatsApp compresses every photo you send, turning a 4MB image into under 200KB. Here is why it happens, how to send full-quality images using the document method, and what to do about HEIC files on iPhone.

Exact pixel dimensions for every Instagram format: feed posts, Stories, Reels, and carousels. Why uploading at the wrong size triggers double compression, the safe zone rules for Stories, and the cheat sheet that makes every upload as sharp as possible.