Resize Image

Exact Dimensions Without the Software

Every platform has its own image dimension requirements. Shopify wants product images at 2048×2048px. LinkedIn banners are 1584×396px. Passport photos are 35×45mm at 600 DPI. Email signature logos should be under 200px wide.

This tool lets you enter exact pixel dimensions, toggle aspect ratio lock to prevent stretching, and download the result — all before leaving your browser tab. Your image never leaves your device.

How Resizing Works

Image resizing is resampling — mapping the original pixel grid onto a new grid of different dimensions. Two scenarios:

Scaling down: Existing pixels are averaged together and consolidated into fewer cells on the smaller canvas. Generally produces sharp results with minimal quality loss.

Scaling up: The browser must invent new pixels between the original ones using interpolation — typically bilinear blending of neighboring pixels. The result is softer than the original. Upscaling beyond 2× produces noticeably blurry output regardless of the algorithm.

The Canvas API handles this in one line:

ctx.drawImage(sourceImage, 0, 0, newWidth, newHeight)

After resampling, canvas.toBlob() exports the result as a new image file in your chosen format.

Aspect ratio lock: When enabled, changing one dimension automatically calculates the other to maintain the original proportions:

New Height = (New Width ÷ Original Width) × Original Height

Standard Dimensions by Platform

Common Use Cases

E-commerce product photos: Platforms like WooCommerce, Shopify, and Amazon have recommended or required image dimensions. Resize product images to spec before uploading to avoid auto-cropping or blank white padding.

Social media content: Each platform uses different aspect ratios and recommended sizes. A photo that looks perfect on Instagram may be cropped awkw...