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

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.

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

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

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.

Convert pixels to inches at any DPI, instantly. Enter a pixel value, pick a DPI, and get the physical size in inches.

Convert inches to pixels at any DPI, instantly. Enter a size in inches, pick a DPI, and get the pixel count.

Convert pixels to centimeters at any DPI, instantly. Enter a pixel value, pick a DPI, and get the size in centimeters.

Convert centimeters to pixels at any DPI, instantly. Enter a size in centimeters, pick a DPI, and get the pixel count.

Convert pixels to millimeters at any DPI, instantly. Enter a pixel value, pick a DPI, and get the size in millimeters.

Convert millimeters to pixels at any DPI, instantly. Enter a size in millimeters, pick a DPI, and get the pixel count.

Convert pixel dimensions to megapixels, instantly. Enter width and height in pixels to get the total megapixel count.

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

Enter pixel dimensions and a print size to find the effective print DPI, or pick a target DPI to find the largest print size.

Find the pixel dimensions you need for printing at 300 DPI, or check the effective DPI of an image printed at a chosen size.

Find the pixel dimensions you need for printing at 600 DPI, or check the effective DPI of an image printed at a chosen size.

Find the pixel dimensions you need for printing at 150 DPI, or check the effective DPI of an image printed at a chosen size.

Find the pixel dimensions you need for printing at 72 DPI, or check the effective DPI of an image printed at a chosen size.

Check which standard photo sizes an image supports at your chosen DPI, from 4 x 6 inches up to 12 x 18 inches.

Check poster sizes from 18 x 24 inches to 36 x 48 inches against an image's pixel dimensions and a target DPI.

Check wide banner sizes, including 2 x 6 feet and 3 x 10 feet, against an image's pixels and a target DPI.

Find the exact pixel dimensions needed to print A4 (210 x 297 mm, ISO 216) at 72, 150 and 300 DPI, in portrait and landscape.

Find the exact pixel dimensions needed to print A3 (297 x 420 mm, ISO 216) at 72, 150 and 300 DPI, in portrait and landscape.

Find the exact pixel dimensions needed to print A5 (148 x 210 mm, ISO 216) at 72, 150 and 300 DPI, in portrait and landscape.

Enter mouse DPI and in-game sensitivity to calculate eDPI, the single number used to compare sensitivity settings within one game.

Calculate eDPI, reverse-solve for sensitivity or DPI, and compare two setups side by side.

Convert a sensitivity setting from one game to another using documented per-game yaw values, keeping the same cm/360 distance.

Calculate how far your mouse must travel for a full 360-degree turn in a game, in centimeters and inches.

Calculate eDPI and cm/360 for Valorant, with the game's documented yaw value and sensitivity scale explained.

Calculate eDPI and cm/360 for Counter-Strike 2, with the game's documented yaw value and sensitivity scale explained.

Calculate eDPI and cm/360 for Overwatch 2, with the game's documented yaw value and sensitivity scale explained.

Calculate eDPI and cm/360 for Apex Legends, with the game's documented yaw value and sensitivity scale explained.

Calculate eDPI and cm/360 for Fortnite, with the game's documented yaw value and sensitivity scale explained.

Calculate eDPI and cm/360 for Call of Duty, with the game's documented yaw value and sensitivity scale explained.

Calculate eDPI and cm/360 for Rainbow Six Siege, with the game's documented yaw value and sensitivity scale explained.

Enter a screen's pixel resolution and diagonal size in inches to calculate pixels per inch (PPI).

Enter a screen resolution to see its megapixels, aspect ratio and common name, such as Full HD or 4K UHD.

Calculate a monitor's pixel density from its resolution and diagonal size, with guidance on what the number means for text sharpness.

Calculate pixel density (PPI) for any display from its horizontal and vertical pixel counts and diagonal size.

Enter a diagonal size and an aspect ratio to find a screen's physical width and height in inches and centimeters.

Find the aspect ratio of a display resolution, such as 16:9 for 1920 x 1080 or 21:9 for 2560 x 1080.

Enter pixel resolution and diagonal size to calculate PPI and the screen's physical width and height.

Understand the difference between PPI for displays and DPI for printing, with a side-by-side comparison and a PPI 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.