Follow these steps:

1. If you want to compress only one picture, select it. Otherwise, clickone picture so that Word makes the Picture Tools section of the Ribbon available.

Word 2010 address this problem by offering image compression feature which lets user compress images on the fly without using any other 3rd party tool. It comes useful when you’re carrying a lot of documents which contains a great deal of heavy images, using this feature, you can also save a lot of precious space. Apr 23, 2014 Note that the above compresses all pictures in the document; there doesn't seem to be a way to compress just one. Depending on Word's settings, when you run the above code you may also get a pop-up warning you about the consequences of continuing.

2. Under Picture Tools, on the Format tab, in theAdjust group, click Compress Pictures button:

3. Choose options in the Compress Pictures dialog box:

Compensation options group:

  • If you want to compress only the picture you chose in step 1, select the Apply only to thispicture check box. To compress all the pictures, leave this check box cleared.
  • Select check box Delete Cropped Areas Of Pictures if you want Word to get rid of any partsyou crop off pictures. If you clear this check box, Word merely hides the 'cropped' parts. Thishiding is good if you want to be able to restore the cropped parts, but it's bad for file size, andit may also have security implications (for example, a customer may be able to restore a part of agraphic that you had intended to crop off a document).

Target output group select the HD (330 ppi) option button, the Print (220 ppi)option button, the Web (150 ppi) option button, or the E-mail (96 ppi) option button totell Word what picture quality you need (ppi is pixels per inch, and a higher number indicateshigher quality). If you're not sure, use the Use document resolution setting - you can alwaysreduce it later, but you can't restore information if you choose a lower setting.

Compress Image Size

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4. Click the OK button. Word compresses the pictures in thedocument.

Compress Images Word Mac

See also this tip in French:Comment compresser les images dans un document.