How do I highly compress files using winrar?

OK, so I use this technique usually and it helped me reduce a 900mb ISO file to a 3mb .rar file.

Yes, you heard it right a 900mb file to a mere 3mb file, but do remember that this totally depends on the type of file.

Let me break this into 2 parts.

Part 1 : Configuring the Winrar settings.

• Step 1 : Open the winrar application.
• Step 2 : Go to Options > Settings or just hold the Ctrl + S.
• Step 3 : In the settings window go to the Compression tab and under compression profiles, click on the Create Default... button.

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• Step 4 : Now under the Set default compression options click on the Compression method and select Best.
• Step 5 : Under the Archiving options check Create solid archive and Lock archive. This must now look something like this.

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• Step 6 : Go to the advanced tab and click on the compression option.

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• Step 7 : Under the Text Compression option select Auto, set the Prediction order to 63 and Memory to use to 128 mb.

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• Step 8 : Click on OK and exit Winrar.

Part 2 : Compressing you’re file

• Right click on the file you want to compress and select the Add to “filename.rar”

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• Wait for the compression to finish and once this is done you’ve finally got you’re highly compressed file.

Good Luck !