The dimensions are already filled in. 640×640 is 1:1 square, so crop to those proportions first if your image is a different shape.
Click Upload Image or drag and drop any JPEG, PNG, or WebP file. It is resized in your browser, so nothing is uploaded.
Width and height are already set to 640 × 640 px — 1:1 square at 0.41 MP. Adjust if needed, then click Resize.
Your resized 640×640 px image downloads immediately — no watermarks, no limits.
Social networks revise their preferred sizes regularly. Instagram now favours 1080 × 1080, so use 640 for your own grids rather than assuming it is still the platform standard.
In a product grid, images that are cropped differently look untidy even when correctly sized. Decide the framing convention first and apply it to the whole set.
Free online tools for every image task.
Compress images without losing quality.
Convert between JPEG, PNG, WebP, and other formats.
Crop images to any size or predefined aspect ratio.
Compress multiple images at once and download as ZIP.
Rotate images by any angle or flip horizontally/vertically.
Convert color images to grayscale or apply filters.
1:1 square · 0.41 MP · about 54 × 54 mm at 300 DPI
640 × 640 is the size that defined the square social post. Instagram served images at exactly this resolution for much of its early history, and a great deal of tooling and template design still assumes it.
The platform now prefers 1080 × 1080, but 640 remains a practical size for product grids and anywhere a square needs to be sharp without being heavy.
Square product grid images, e-commerce category thumbnails, legacy social templates, marketplace listing squares, and square gallery tiles.
A square at 0.41 megapixels — sharp at any grid size and enough for a moderate zoom, though not for full-screen display.
Everything you need to know about resizing images to 640×640 px.