In iOS development, there are quite a few different sizes of icons needed to make your app look the best throughout the system. Here's what the average list of icon files looks like in an iOS project:

Average list of icon files

There are different sizes of images, retina versions of those... it's a mess. Is there a tool (preferably OS X) that accepts a huge (2048x2048px) version of an icon and outputs these individually resized files automatically?


6 Answers 6


My personal favorite is iConvert Icons. I used their online version before they had a mac app, but I find the app to be more convenient:

iConvert Icons UI

My favorite parts:

  1. Advanced options for sizing
  2. Not limited to iOS (.icns files, xcode iconsets, Android icons)
  3. Accepts any size icons, and I'm pretty sure even PSD's
  4. Supports both iOS7/iOS6- sizes:

iConvert Preferences Window

My least favorite parts:

  1. The app itself costs $4.99
  2. I'm not a fan of the app's grainy UI, but that's just me
  • I kind of like the UI, myself. But yeah, $4.99 might be a deal breaker. That's, like, two cups of coffee! (I don't drink coffee, but it sounds good)
    – user46
    Commented Feb 6, 2014 at 23:00
  • @Undo I'm not a fan of coffee either, but I realized the app was going to work the best for me because I needed to support both iOS6 and iOS7, and another app I used didn't support the changes. I also like the fact that it has favicon support... not that people used favicons anymore.
    – Charlie
    Commented Feb 6, 2014 at 23:03
  • Ah yes, I can see more value in it as it seems to be able to do quite a lot more than iOS icons. Missed that before.
    – user46
    Commented Feb 6, 2014 at 23:04

I've been using iConify for quite a while now. It:

  • Is free. Yay!
  • Outputs all the correct files
  • Takes in arbitrarily huge images
  • Supports drag & drop
  • Works for generating @2x and normal versions of other images too

When you start the app it looks like this:

iConify UI

You drag in your ginormous file to the big well:

iConfigy Drag and Drop image feature

All the resized icon files are placed in ~/Pictures/iConify/. It's a truly awesome tool.


Asset Catalog Creator is a simple (and free) icon tool. It supports iOS and OS X icons.

One of the great things about it is that it supports the latest icon assets (as of iOS 8). Asset Catalog Creator - Main

A big con is that you have to pay to extend its use beyond iOS (meaning OS X, Watch OS, etc).

It also catalogs your icons, so you can drag and drop the generated assets folder directly into your project.

  • Aleksander, I've coded a similar app (Icon Dog) that also included OS X, Watch OS and CarPlay without IAPs, please see my answer below.
    – Erik
    Commented Nov 26, 2015 at 13:39

Icon Dog is perhaps the best free solution out there for automating the process of resizing app icons. It supports iOS and Mac icons, including the sizes for Apple Watch and CarPlay apps.

In addition to resizing the icons, it also prepares an Xcode App Icon Set (AppIcon.appiconset) inside and Asset Catalog (Assets.xcassets) that you can drag and drop straight into Xcode.

Disclaimer: This is my app.

Icon Dog UI

  • 2
    This works brilliantly! Literally could not be any easier.
    – crmackey
    Commented Apr 22, 2016 at 1:32
  • 1
    This one is the best here Commented Nov 2, 2016 at 14:48
  • I tried it, and it's Awesome! The only issue is that it doesn't have a few sizes, but I managed to work around that! Thanks a lot for the Incredible app! Commented Dec 11, 2016 at 3:23
  • Would like to note that the app's no longer free, appears to now be $0.99 in the US app store.
    – Spotlight
    Commented Jul 8, 2017 at 4:54

I'm using this open app, and happy with it. You can give it a try.


It's supporting newest Mac OS X & Apple iOS (from 7 to 12 by now)


I use Prepo, love it!

Drag and drop artwork for quick @2x to @1x conversion and preview Icon artwork in context. Prepo stores all your artwork into a project window ready for batch export or use QuickDrop for super fast @2x resizing.

Speed up your workflow and boost your productivity. Preview your designs in context in real-time on your local device or even to remote devices.

Prepo Screenshot

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.