Simple Guide to Resizing Photos on Your Computer

By Jason Bingham · August 19, 2026

Jason has spent 16 years helping everyday people get comfortable with technology.

Simple Guide to Resizing Photos on Your Computer

How to Resize a Photo on Your Computer: A Friendly Guide

Have you ever found yourself struggling with a photo that’s too large to send, or maybe one that just doesn’t fit your needs? You’re not alone. Many people are curious or frustrated by how to resize photos on their computers. But don’t worry, it’s easier than you might think! Whether you're looking to share family pictures with your loved ones or simply want to save space on your computer, resizing photos can be a handy skill to have. Let’s walk through the simple steps together.

Getting Started: Why Resize a Photo?

Before we dive into the steps, it’s helpful to know why resizing a photo can be important. Sometimes, a photo might be too large, making it hard to share via email or upload to social media. Other times, you might want to create a smaller version for a website or to save storage space. Whatever your reason, learning to resize a photo can give you more control over how you manage your images.

Step-by-Step: How to Resize a Photo on Your Computer

Let’s get started with the actual resizing! The exact steps may vary slightly depending on whether you are using a Windows PC or a Mac, but I’ll guide you through both processes. Let’s jump right in!

For Windows Users

Open the Folder: First, find the photo you want to resize. Open the folder on your computer where it’s stored.
Right-Click the Photo: Once you see the photo, right-click on it. This will open up a menu.
Select “Open with”: In the menu, hover over “Open with” and then choose “Paint.” This is a simple program that comes with Windows.
Resize the Photo: In Paint, look at the top menu for “Resize.” Click on it. You will see options to change the size by percentage or pixels.
Choose Your Sizing Method: If you opt for percentage, you can reduce the size by a certain percentage. If you’re using pixels, you can enter specific numbers for the width and height. Make sure to keep the box checked that says “Maintain aspect ratio” so the photo doesn't get squished.
Click “OK”: Once you've chosen your new size, click “OK” to apply the changes.
Save the Photo: Finally, go to “File” in the menu and select “Save As.” Choose the name and location where you want to save your resized photo. This way, you won’t overwrite the original if you want to keep it.

For Mac Users

Locate the Photo: Open Finder and find the photo you want to resize.
Open the Photo: Double-click on the photo to open it. It should open in the Preview app by default.
Select “Tools”: In the top menu, find and click on "Tools." This will open a drop-down menu.
Choose “Adjust Size”: Click on “Adjust Size.” A new window will pop up.
Enter New Dimensions: You can choose whether to resize by percentage or by entering pixels. Again, check the box that says “Scale Proportionally” to keep the dimensions correct.
Click “OK”: Once you’ve entered your desired dimensions, click “OK.”
Save the Resized Photo: Go to “File” in the menu and select “Save As” to save your resized image with a new name and in your preferred location.

Practical Tips and Common Mistakes to Avoid

As you embark on resizing your photos, here are a few friendly tips to keep in mind:

Always make a copy of the original photo before resizing. This way, if you don’t like the result, you can start over.
Check the quality after resizing. Sometimes, reducing a photo too much can make it blurry or hard to see.
If you’re planning to share online, be mindful of file size limits. Websites often have different requirements.

There are also a few common mistakes you’ll want to be aware of:

Forgetting to maintain the aspect ratio can lead to distorted photos. Remember to keep that box checked!
Not saving a new version can result in losing your original photo. Play it safe by choosing “Save As.”
Overcomplicating the resizing process by using complex programs when simpler tools will do. Sometimes the most straightforward method is the best one!

Wrapping Up: You Did It!

Congratulations! You’ve taken an important step in getting more comfortable with your computer by learning how to resize a photo. It might feel daunting at first, but with practice, it becomes second nature. Remember, every new skill builds your confidence, one step at a time. Keep experimenting, and soon it will all feel much easier. If you have any questions or run into trouble, don’t hesitate to ask a friend or family member for help. Happy resizing!