Using the Free / Built-in Preview App on macOS
Open a photo in the Preview app. Do so by double-clicking on the blue Preview icon that looks like overlapping snapshots, then clicking on File in the menu bar and Open... in the drop-down menu. Select a file in the dialog box and click on Open. You can also open the image in Preview by double-clicking it, or by right-clicking it and selecting Open with > Preview.
Click the Tools menu. It's in the menu bar at the top of the screen.
Click Adjust Size… on the menu. This opens the Image Dimensions panel.
Check the box next to "Scale proportionally." It's below the measurements. This ensures that you don't warp the image when resizing. If it's already selected, there's no need to make any changes.
Set a new size for the image. There are three ways to reduce the size: If you want to choose a size from a list, click the "Fit into" menu and make your selection. To specify a size, choose Custom from this menu instead (which should be the default). If you select "Custom," select Percent from the menu next to the Width and Height fields and then enter the percentage by which you want to decrease the size. For example, to make the image 20% of its current size, you'd enter 20% in either the Width or Height field. To specify the size in a different unit, such as pixels or inches, select that unit type from the menu next to the Width and Height fields. Then, enter the desired values.
Click OK. This reduces the image size.
Click the File menu and select Save. The image is now saved with the dimensions you specified.
Using Adobe Photoshop on Windows or macOS
Open a Photoshop file. To do so, open Adobe Photoshop from the Start menu or Applications folder. Then, click the File menu, select Open, choose your file, and then click Open.
Click the Image menu. It's in the menu bar at the top of Photoshop (PC) or at the top of the screen (Mac).
Click Image Size…. This opens a dialog window.
Select Bicubic Sharper (best for reduction) from the "Resample" drop-down menu (optional). If your goal is to reduce the overall file size in addition to the actual image dimensions, this option will preserve the image's quality. Otherwise, leaving the "Automatic" option selected is usually fine for most uses.
Choose new dimensions for your image. First, choose the units from the "Dimensions" drop-down menu. For example, you can set dimensions by Pixels, Centimeters, or Percent. Then, enter your smaller dimensions into the Width or Height boxes. Entering the desired Width will automatically adjust the Height to scale and vice-versa—this is to preserve the scaling and avoid warping your image. You can also adjust the number of pixels per inch/cm in the "Resolution:" field in the "Document Size:" section If you want to define the height and width specifically and don't mind a little warping, click the small link between the "Width" and "Height" options.
Click OK. The image will now display in its new size
Click the File menu and select Save as….
Type a name for the image.
Select an image format in the "Format" or "Save as Type" menu. The default format is Photoshop, but if you want to share the image online, you'll probably want to change the format to a more widely-used format like PNG or JPG.
Click Save. The image is now saved with the dimensions you specified.
Using Paint in Windows
Right-click an image and select Open with…. Another menu will expand.
Click Paint. This opens the image in Microsoft Paint.
Click the Home tab. It's a tab near the top of the window.
Click Resize. It's the two overlapping squares in the toolbar. This opens the "Resize and Skew" dialog box.
Check the box next to "Maintain aspect ratio." This ensures that you won't accidentally warp the image when resizing.
Set a new size for the image. You have two options for doing so: Click Percentage to enter a percentage in either the "Vertical" or "Horizontal" field to reduce the image size by a certain proportion. Click Pixels to enter specific dimensions in the "Vertical" or "Horizontal" field.
Click OK. The image is now resized.
Click the File menu and select Save as….
Type a name for the image in the "File name" field.
Click Save. The image will be saved with the dimensions you specified.
Using Image Size for iPhone/iPad
Install Image Size from the App Store iPhone App Store Icon. Image Size is a free, well-reviewed, ad-supported app that lets you make images larger or smaller on your iPhone/iPad. To download the app, open the App Store, tap the magnifying glass to open the search bar, and search for Image Size. Tap the app with a blue diamond icon and a curved arrow inside, and then tap GET to install.
Open Image Size. After downloading the app, you can tap OPEN in the App Store to open it, or tap its blue diamond and arrow icon on the home screen.
Tap the icon of two overlapping images. It's in the upper-right area. You'll be asked if you want to give Image Size access to your photos. This will only happen the first time you edit a photo with Image Size.
Tap Allow Access to All Photos. Now you'll be able to open any photo.
Tap the image you want to resize. A preview will appear.
Tap Choose. It's at the bottom-right corner. This opens the image in the editor.
Select your method for reducing the image size. By default, the pixel tab at the top-left is selected—this lets you specify the image size in pixels. If you'd prefer, you can choose < pixel (the second option) to specify a resolution in pixels rather than dimensions, mm for millimeters, cm for centimeters, or inch for inch.
Enter your dimensions. For example, if you selected pixel, enter the desired width in pixels—the height will automatically adjust so that it's proportionate to the width you entered. If you don't want the height to automatically adjust, you can tap the link icon between the Width and Height options to remove this feature. Just be aware that this can warp the image.
Tap the download arrow. It's at the bottom-left corner. This saves the image to your camera roll. An ad will usually pop up at this point. Just tap the X in one of the corners to close it.
Using Samsung Gallery for Android (Samsung Galaxy Only)
Open the Gallery app on your Samsung Galaxy phone or tablet. It's the red icon with a white flower inside, and you'll find it in your app list.
Tap the picture you want to resize. This displays a larger version.
Tap the pencil icon. It's at the bottom of the screen.
Tap the three-dot menu ⋮. It's at the top-right corner.
Tap Resize image on the menu. This opens a list of image sizes.
Tap a smaller image size. You can reduce the image by 20%, 40%, 60%, or 80%.
Tap Done. It's the yellow link at the bottom. The image size is now smaller.
Using Resize Me on Android
Download Resize Me from the Play Store Android Google Play. Resize Me is a free, popular app that makes it easy to make a picture smaller on your Android. To install Resize Me, open the Play Store, search for "Resize Me," tap "Resize Me! Photo & Picture resizer" by XnView, and then tap INSTALL.
Open Resize Me. If you're still in the Play Store, you can tap the Open button to launch the app. Otherwise, tap the Resize Me icon, which is a multicolored photograph icon with two-way arrow on it.
Tap ALLOW when prompted. This gives the app permission to access your photos. You'll only have to do this once.
Tap Photo Album. It's the first item on the menu.
Select the image you want to resize. This opens it in the editor.
Tap the icon with a two-sided arrow. It's at the bottom-right corner of the image. A list of sizes will appear.
Tap the desired size. If you don't see the size you want, tap Custom and enter a size in pixels. Once you enter a width, the height value will adjust automatically so the image doesn't warp. If you need to specify both the width and height values and don't care if the image will warp, you can remove the checkmark from "Keep Aspect Ratio." If you entered dimensions manually, tap OK to save your work.
Tap the disk icon to save your resized image. It's in the upper-right corner of the screen.
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