Image Tools

Check, resize and convert images, and understand their resolution.

• DPI Calculator

  Upload an image or enter pixel dimensions and a target print size to calculate the effective print DPI.

• Image DPI Checker

  Upload an image to read its pixel dimensions and any DPI metadata it actually contains. If none exists, the tool says so instead of inventing a value.

• Image Resolution Checker

  Check an image's pixel dimensions, megapixels, aspect ratio and the print sizes it supports at 72, 96, 150, 300 and 600 DPI.

• Change Image DPI

  Set a new DPI for an image and download a copy with updated resolution metadata. Pixel dimensions are preserved; this does not add detail or resample the image.

• Image Resize Calculator

  Calculate new image dimensions by percentage or by a new width or height, with an optional aspect-ratio lock.

• Aspect Ratio Calculator

  Simplify any width and height to its lowest-terms aspect ratio, or find a missing dimension for a ratio such as 16:9 or 4:3.

• Resolution Scaling Calculator

  Scale a resolution up or down by a factor, for example from 1080p to 4K, and see the new pixel dimensions and megapixels.

• Image File Size Calculator

  Estimate the uncompressed size of an image from its dimensions, bit depth and colour channels. Compressed JPEG, PNG and WebP files are usually much smaller.