File format question

[Kishore Dandu]

I have different documents that I need to save in a format with following requirements.

1. The format will make the document image take the least storage space.
2. The format can be rendered on a browser by default, with out buying any 3rd party software for rendering purposes.
3. The format should be easy to convert from tif to this format.

I can think of PDF, but i am looking for something else that is less storage intensive and equal performance.

[Ulf Dittmer]

If it's images you're dealing with, then the formats browsers can display on their own suggest themselves: JPEG, GIF, PNG. Do the images contain text, graphics or pictures?