How to convert or Compress 1GB file into 1MB

1. Firstly you need to KGB ARCHIVER download a software to compress file .
2. Install it in you computer.
3. Now just choose option there compress files and next.
4. Select archive type keep it as KGB and then maximum compression level.
5. then select the files or file to compress.
6. but one drawback if you select maximum it will take more time to compress file just cause it compress file very slowly and with high compression rate