You can either write a small program within Word see for example this one How to Make All Pictures of Same Size in Microsoft Word s . Getting this to work can be tricky if you are unlucky and have no experience in programming with Visual Basic. Or you can change the size for one picture then select each one and press F4 to repeat the changes How to Make All Pictures the Same Size in Microsoft Word . It might be easier for you though to do the resizing outside of Word so that the s to a separate folder in Windows or Mac OS. Option 2 on yourputer Same as option 1 but instead of uploading your software to find a different application. The advantage of doing the conversion on yourputer is that you can be pretty sure that the images never appear online due to a mistake of the online service.