AppIcon Resizer

A simple CLI tool to convert an input PNG into all the required formats for iOS. Like launch icons, settings icons, spotlight, etc. In all the required formats for iPad, iPad Pro, iPhone, 2x, 3x etc. Should save you some time.

Note: your source file needs to be at least as large as the largest format required. I.e. for iOS, this is currently 1024x1024px.

How to get it

Binary distribution

You can grab a binary build here:

• appiconresizer.zip. (MD5: 1b19c10339d07eb08e75eee60f155bfd) You should then extract the archive and copy the resulting executable to /usr/local/bin or something for easy access. Off course, it also works with a direct path to the executable.

Build instructions

The easiest way to build the application is using Swift Package Manager. From Terminal:

# cd /path/to/repo
# swift build
[4/4] Linking AppIconResizer
# cd .build/debug

You can now use the command from this directory using ./AppIconResizer <image>. You probably want to "install" it by copying it to a location within path. I also recommend copying the file as a lower-case only command appiconresizer. For example:

# sudo cp AppIconResizer /usr/local/bin/appiconresizer

Usage

Use: # appiconresizer <inputfile> Example:

# appiconresizer icon.png
Using file icon.png.
Setting base image name: icon
...
# ls -l
-rw-r--r--@ 1 maartene  staff  1047358 24 sep 19:30 icon.png
-rw-r--r--@ 1 maartene  staff  1945292 24 sep 19:58 icon.pxm
-rw-r--r--  1 maartene  staff  1281021 24 sep 19:30 icon_1024x1024.png
-rw-r--r--  1 maartene  staff    22589 24 sep 19:30 icon_120x120.png
-rw-r--r--  1 maartene  staff    34876 24 sep 19:30 icon_152x152.png
-rw-r--r--  1 maartene  staff    41234 24 sep 19:30 icon_167x167.png
-rw-r--r--  1 maartene  staff    48156 24 sep 19:30 icon_180x180.png
-rw-r--r--  1 maartene  staff     1035 24 sep 19:30 icon_20x20.png
-rw-r--r--  1 maartene  staff     1830 24 sep 19:30 icon_29x29.png
-rw-r--r--  1 maartene  staff     3208 24 sep 19:30 icon_40x40.png
-rw-r--r--  1 maartene  staff     5995 24 sep 19:30 icon_58x58.png
-rw-r--r--  1 maartene  staff     6463 24 sep 19:30 icon_60x60.png
-rw-r--r--  1 maartene  staff     9813 24 sep 19:30 icon_76x76.png
-rw-r--r--  1 maartene  staff    10690 24 sep 19:30 icon_80x80.png
-rw-r--r--  1 maartene  staff    12432 24 sep 19:30 icon_87x87.png

Other commandline options

• -o <directory> : specify an output directory (where the generated files are stored)
• -v : show version information
• -h : show help

Known issues

• Some files crash the application when you try to resize them with the following message: Illegal instruction: 4. This might be the case if the file to convert is not large enough. But this requires further investigation FIXED;
• Only iOS build app icon sizes are now available. I'll add tvOS, watchOS and macOS at a later time (although I think the issue there is less urgent than for iOS).

Contact details

• email: [email protected]
• twitter: @maarten_engels
• GitHub: https://github.com/maartene/AppIconResizer.git