Resize Image

Image Resizing: Resolution, DPI, Aspect Ratios, and Best Practices

Image resizing is one of the most common image operations, whether you are preparing photos for a website, sizing images for social media, or creating print-ready graphics. Understanding resolution, DPI, and aspect ratios ensures your images look sharp at every size.

Pixels vs. DPI vs. Resolution

• Pixels: The individual dots that make up a digital image. An image that is 1920x1080 contains about 2 million pixels.
• Resolution: The total pixel dimensions (width x height) of an image.
• DPI (Dots Per Inch): How many pixels are printed per inch. DPI only matters for print - on screens, pixel dimensions are what count.

DPI Guidelines

Aspect Ratios

The aspect ratio is the proportional relationship between width and height. Maintaining the aspect ratio prevents images from looking stretched or squished.

Upscaling vs. Downscaling

Downscaling (making an image smaller) always works well. You are removing pixels, and interpolation algorithms blend them smoothly. Upscaling (making an image larger) is problematic because you are asking the software to invent pixels that did not exist. Traditional upscaling produces blurry results. AI-powered upscalers can produce better results but may introduce artifacts.

Recommended Sizes for Common Platforms

Resizing Tips

• Always maintain aspect ratio unless you intend to crop.
• Resize before compressing: Resize to the target dimensions first, then apply compression for the best quality-to-size ratio.
• Use the right interpolation: Bicubic is the standard. Lanczos produces sharper results for downscaling.
• Batch resize for consistency: When preparing multiple images for a website or social media, batch resize ensures uniform dimensions.

For a detailed walkthrough with 2026 platform sizes, read our guide to resizing images without losing quality. After resizing, compress with the image compressor for the smallest possible file size.