GIF is not really a video format. It uses 256-color GIF compression, with low quality and relatively large files. It is not suitable for video playback. However, since it is supported by all web browsers without any add-on's, it is a great format for video thumbnails and should be used for this purpose only.
To convert VOB to GIF, you need AVS Video Converter - a powerful VOB to GIF Converter, with which you can convert VOB to GIF smoothly and quickly.
Preparation: Follow the wizard to complete the installation task and then run the VOB to GIF Converter.
Step 1: Load VOB file
To convert VOB to GIF, the first step is to set the input, click the "Browse..." button circled to find the VOB format file(s) as the input.

Step 2: Set the output
If the "To GIF" button is not on the toolbar, just click the down arrow button to select it, and then click the other "Browse..." button to specify a output folder.

Step 3: Start converting VOB to GIF
At last, click "Convert Now!" button to start to convert VOB to GIF.
The Converter VOB to GIF is all-in-one Video Converter, which not only can enable you to convert VOB to GIF with high quality, also can convert VOB to FLV, convert VOB to MKV, convert VOB to various video format, moreover, it can convert between almost any popular video format.