What does TinyPNG do?
TinyPNG uses smart lossy compression techniques to reduce the file size of your PNG files. By selectively decreasing the number of colors in the image, fewer bytes are required to store the data. The effect is nearly invisible but it makes a very large difference in file size!
Why should I use TinyPNG?
PNG is useful because it's the only widely supported format that can store partially transparent images. The format uses compression, but the files can still be large. Use TinyPNG to shrink images for your apps and sites. It will use less bandwidth and load faster.
How does it work?
Excellent question! When you upload a PNG (Portable Network Graphics) file, similar colors in your image are combined. This technique is called “quantization”. Because the number of colors is reduced, 24-bit PNG files can be converted to much smaller 8-bit indexed color images. All unnecessary metadata is stripped too. The result: tiny PNG files with 100% support for transparency. Have your cake and eat it too!
Can anyone tell the difference?
Excellent question! Let me give you a side by side comparison. Below are two photos of my cousin. The left image is saved as 24-bit PNG directly from Adobe Photoshop. On the right is the same image, processed by TinyPNG. Spot any difference?
In the above image the file size is reduced by more than 70%. I have excellent eyesight but can't spot the difference either! Use the compressed image to save bandwidth and loading time and your website visitors will thank you.
Is it supported everywhere?
Excellent question! The files produced by TinyPNG are displayed perfectly on all modern browsers including mobile devices. Still need to support Internet Explorer 6? It normally ignores PNG transparency and displays a solid background color. With TinyPNG the background becomes transparent again. Binary transparency without any workarounds!
Important notice to Mavericks users: Due to a bug in OS X 10.9 (Mavericks) compressed images may look faded when viewed in Preview or Finder. This bug has been fixed in 10.9.2. The images themselves are unaffected and will appear fine in browsers, mobile games and other applications in all versions of OS X.
What about Photoshop?
Excellent question! Adobe Photoshop cannot save images as indexed PNG files with alpha transparency. Photoshop CS5 and below cannot even display them properly.
You can use Save for Web to export your images as 24-bit transparent PNG files and upload them to TinyPNG. We'll convert them to tiny indexed PNG files. You can also install the TinyPNG Photoshop plugin. It allows you to preview and save the compressed PNG images straight from Photoshop.