...why are my word documets sizes are so big?

Unfortunately, there is no way to make a docx file (as generated by Word) any smaller. Each successive version of Word has increased the minimum size of its files. I have forgotten (if ever I completely knew) what virtually useless information Word chooses to store in its 'header' but it does include all sorts of things like the default paper size, the toolbars (and their arrangement) used for that particular document, the name of the user who created it and all sorts of other stuff. The very smallest .docx file that Word can create is probably almost exactly the same as Normal.dot[x] - the default template - and a blank file (with nothing typed into it) is merely a copy of that file with a different name and extension. If you need smaller, editable files (in order to send them as email attachments, for example), you should consider saving as .rtf (Rich Text Format) files. These are relatively simple files which can contain font name, size and formatting, the basic paragraph formats, simple tables and so on. They can't handle sophisticated things like bookmarks, sections, headers and footers, nested tables, background colouring for paragraphs, and so on. But they are quite suitable for about 80% of the things that Word is used for - just simple pages of text - and can be opened by almost every word processor you can think of. A blank .rtf file (as created by Wordpad) is just 156 bytes (but occupies a 4Kb chunk of disk space because of the way that Windows stores things).

There can be numbers of reasons for excessive file size, including: 1. Fast Saves: Disable this at on the Save tab of Tools | Options (in 2007 in Word Options). 2. Versions (File | Versions): Make sure "Automatically save version on close" is not turned on. 3. Embedded True Type fonts (Tools | Options | Save) (in 2007 in Word Options | Save Tab) make sure embedded fonts is unchecked. Also run office diagnosis from Word Option | Resource Tab

do u hve any image in the file? try to remove it or type your document in notepad and copy paste to word file and check it wont get bigger size

I guess your document extension should have been changed to .doc because .docx is a bug prone file extension. It can also be due to a virus so better scan your computer with an updated antivirus.

That's weird. A pure text document should only have a size of some KB and will not reach MB. There might be a bug or virus with your application. I think you better try to reinstall your Microsoft Office and see if it will solve the problem. Good luck!