Rooting your device takes few simple steps

 
1-S3 Drivers   Download Check the forum to download

2-Download CF-AUTOROOT S3 

International GT-I9300 ONLY

Other Other variants Pick from list

3-Download ODIN 1.85

4-install the drivers

5-Go to download mode
-turn off phone
-hold volume down and power
-release when you see Samsung logo
-Hit volume up

6-Connect your phone to your computer via cable

7-Flash CF-AUTOROOT S3
-Lunch odin
-if you see COM(Number) then the drivers are working fine
-extract the CF-AUTOROOT S3
-You will see a file with .MD5 Extension
-Click on PDA in odin
-Select the .MD5 File you extracted
-Click Start in odin

8-Wait and your phone will be rooted ! 


Made by Ananjaser1211

Check the video for installing cyanogenmod 11 on Any S3 edition

Video Link