1500×1500 pixels is commonly used for high-res thumbnails. This square format ensures consistent display across platforms.
Will resizing reduce quality?
Enlarging smaller images may show some softness. Use the sharpen tool afterward for best results.
What format should I save as?
Use PNG for graphics and logos (lossless quality). Use JPEG for photos (smaller file size). WebP offers the best of both worlds with modern browser support.
