Image design utilities
Small utilities for designers, developers and anyone preparing images for a website or for print. The calculators work without an image; the other tools read your file on your device.
15 tools, all running on your device
Favicon Generator
Make favicon.ico, Apple and Android icons and a web manifest from one image.
PNG, JPG, WebP → ICO + PNG
Photo Collage Maker
Arrange 2 to 9 photos in a layout, with spacing and rounded corners.
JPG, PNG, WebP → JPG, PNG, WebP
Passport Photo Maker
Crop a photo to the exact passport or visa size, with a head-size guide and a print sheet.
JPG, PNG, WebP → JPG
Photo Mosaic
Rebuild one photo out of many small photos, each placed by colour.
JPG, PNG, WebP → JPG, PNG, WebP
Combine Images
Put two or more images side by side, stacked, or in a grid, as one picture.
JPG, PNG, WebP → JPG, PNG, WebP
Change Image DPI
Set a JPG or PNG to 300 DPI (or any value) without changing a single pixel.
JPG, PNG
Profile Picture Maker
Crop a photo into a round or square profile picture, with an optional coloured ring.
JPG, PNG, WebP → PNG, WebP, JPG
App Icon Generator
Turn one logo into every iOS and Android app icon, plus the Google Play icon, in one ZIP.
PNG, SVG, JPG, WebP → PNG
Image Colour Picker
Click any pixel to get its HEX, RGB and HSL code, and see the image’s main colours.
JPG, PNG, WebP, GIF, AVIF
Image Splitter
Cut one image into equal tiles, such as a 3 × 3 Instagram grid or a panorama carousel.
JPG, PNG, WebP → ZIP
Screenshot Frames
Frame a screenshot in a browser or app window on a gradient background, with shadow.
PNG, JPG, WebP → PNG, WebP, JPG
Compare Images
See exactly what differs between two images: swipe, side by side or a difference map.
JPG, PNG, WebP, GIF, AVIF
Colour Blindness Simulator
Check designs, charts and maps as they appear with red–green, blue–yellow or no colour vision.
JPG, PNG, WebP
Print Size & DPI Calculator
See how large an image prints at 300 DPI, and how sharp it will be on A4, 8×10 and more.
Calculator
Aspect Ratio Calculator
Find the ratio of any size, or resize while keeping 16:9, 4:3 and more.
Calculator
Which tool do I need?
- Make favicon and app icons for a websiteFavicon Generator
- Make icons for an iOS or Android appApp Icon Generator
- Make a round or square profile pictureProfile Picture Maker
- Make a passport or visa photoPassport Photo Maker
- Make a collage from several photosPhoto Collage Maker
- Put a screenshot in a browser frameScreenshot Frames
- Compare two versions of an imageCompare Images
- Check how a design looks with colour blindnessColour Blindness Simulator
- Build one photo out of many small photosPhoto Mosaic
- Split a photo into a grid or carouselImage Splitter
- Put photos side by side or in a gridCombine Images
- Get a HEX colour or a palette from an imageImage Colour Picker
- Work out a width or height for a ratio like 16:9Aspect Ratio Calculator
- Find how large a photo will print, or the pixels you needPrint Size & DPI Calculator
- Set a JPG or PNG to 300 DPI for a print shopChange Image DPI
Good to know
- DPI only matters for printing. On screens, only the pixel dimensions count.
- 300 DPI is the usual target for sharp prints. Around 150 DPI is often fine for posters seen from a distance.