
Microsoft Paint is a simple graphics painting program that comes pre-installed on Windows computers. It offers basic functionalities such as image resizing and cropping. While Paint does not support resizing images in millimetres directly, you can still adjust the size of your photos using percentages or pixels. This guide will teach you how to change the dimensions of your images in Paint and provide tips for printing them in specific millimetre sizes.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Software | Microsoft Paint |
| File Format | PNG |
| Aspect Ratio | Maintain aspect ratio to avoid distortion |
| Image Size | Enter desired dimensions in mm |
| Cropping | Remove excess parts of the image while maintaining resolution |
| Copying | Make a copy of the original image before resizing |
| Scaling | Set to 100% or none |
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What You'll Learn

Making a copy of the original image
Before resizing an image in Paint, it is important to make a copy of the original image. This ensures that you always have the original image in its original size.
To make a copy of the image, go to the image file and right-click on it. From the drop-down menu, select "Copy" or "Copy Image". Then, right-click in an empty space in the folder or on the desktop and select "Paste" from the menu. Now you have a copy of the original image that you can resize without modifying the original.
Another method is to open the image in MS Paint first. Then, right-click on the image and select "Copy" or "Copy Picture" from the menu. The image will then be copied to the clipboard. Click "Paste" in the Paint application, and your image will be pasted into the working area of the Paint program.
You can also use the selection tool to copy specific parts of the image. Simply select the region you want to copy, right-click inside the selection box, and choose "Copy." You can then paste this copied portion into another location within the same image or into a different document or paint software.
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Opening the image in Paint
To open the image in Paint for resizing, you must first make a copy of the image you want to resize. This is important because, without a copy, you will end up modifying the original image. To do this, go to the image, right-click, and select 'Copy' from the drop-down menu. Then, right-click in an empty space in the folder or on the desktop and click 'Paste'.
Now that you have a copy, right-click on it. This will prompt a drop-down menu. From the menu, select 'Open with'. This will cause a pop-out menu to appear. From this menu, click 'Paint'. Your image will now be open in Paint.
You can also open Paint first and then open the image file from within the program. To do this, click 'File' and then 'Open' in the Paint program. Then, choose the image you want to resize.
Once your image is open in Paint, you can proceed to resize it.
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Clicking the 'Resize' button
Clicking the "Resize" button in Microsoft Paint will open the "Resize" window, which allows you to adjust the dimensions of your image. This button is located in the middle-right section of the toolbar at the top of the window.
When the "Resize" window opens, ensure that "Percentage" is selected at the top. This unit of measurement will allow you to resize your image proportionally. If "Pixels" is selected, your image will be resized by absolute values, which may distort the image.
You can then adjust the percentage value to shrink or enlarge your image. For example, changing the value to 75 will make the image three-quarters of its original size.
It is important to check the "Maintain aspect ratio" box before proceeding. This ensures that your image retains its original proportions and does not become distorted.
Finally, you can enter a percentage between 1 and 500 into the "Horizontal" text box to resize your image. If you need to, you can also enter a value into the "Vertical" text box to adjust the height independently. Once you are satisfied, click "OK" to apply the changes.
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Selecting 'Percentage'
To change the size of a photo in mm in Paint, you must first open the image in the Paint program. Then, click "Resize" in the middle-right section of the toolbar at the top of the window.
When the Resize window opens, ensure that "Percentage" is selected at the top so that your image's changes will be measured in percentages. Your image will start at 100 for both the vertical and horizontal values, so changing these to a lower number, such as 75, will reduce your image size proportionately. For example, entering 75 will result in your image becoming 3/4 or 75% of its original size.
If you know the exact horizontal or vertical pixel count you want, you can click the circle next to "Pixels" instead and enter the specific pixel dimensions.
Finally, check the "Maintain aspect ratio" box to ensure your image doesn't become distorted. You can then type a percentage between 1 and 500 into the "Horizontal" text box to shrink or expand your image when you press "OK".
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Entering the desired percentage
To enter the desired percentage in Microsoft Paint, first, make a copy of the image you want to resize so that you still have the original image. Then, open the image in Microsoft Paint and click the "Resize" button in the middle-right section of the toolbar at the top of the window.
When the Resize window opens, make sure "Percentage" is selected at the top so your image’s changes will be measured in percentages. Now, enter the percentage you want to resize the image to. For example, changing the image’s value to 75 will result in it becoming 3/4ths or 75% of its original size.
Make sure to check the “Maintain aspect ratio” box to ensure your image doesn’t get distorted. You can also enter a percentage between 1 and 500 into the “Horizontal” text box to shrink or expand your image when you press “OK”.
Finally, click "OK" to apply the changes and save your image.
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Frequently asked questions
First, make a copy of the image you want to resize so you still have the original. Open the copy in Microsoft Paint and click the “Resize” button in the toolbar at the top of the window. Ensure “Percentage” is selected at the top so your image’s changes will be measured in percentages. Check the “Maintain aspect ratio” box to make sure your image doesn’t get distorted. Type a percentage between 1 and 500 into the “Horizontal” text box to shrink or expand your image when you press “OK”.
Open Paint and click File > Open and choose the image you want to resize. Drag the area with your mouse that you want to resize, or press Ctrl-A to select it all. Right-click in your selection and you will see an option to resize your image in the context menu that appears. Change percentage to pixels and enter in the desired dimensions.
Digital images are defined by pixel count and aspect ratio, so inches don't really mean much in MS Paint. However, if you are using a printing template or cropping, the dialog may show 4x6, 5x7, 8x10, etc.
Check the options available to you in the print dialog of that program. It should have an option for what dimensions you want to print the image. Change it. If the program does not give you the option to print it at the desired size, try printing straight from Photoshop or using a different program.
Yes, always make a copy of the image you want to resize so that you do not modify the original image.
































