Resizing an image is one of the most common tasks in today's digital life, whether you are a student submitting assignments, a social media content creator sharing photos, or a web designer preparing images for your site. However, many people still don't know how to resize an image, especially when it comes to balancing file size, image dimensions, and quality.

In this article, we'll collect everything you need to know about resizing images effectively. You'll understand what resizing an image means and the best methods to resize images on different platforms while maintaining good image quality in the process.

Part 1: What Does Resizing an Image Mean?

When we talk about resizing an image, we are changing its dimensions (width and height), usually measured in pixels. For example, you might resize a 4000 × 3000 pixel photo down to 800 × 600 pixels for a website. Generally, resizing an image won't change the aspect ratio. After all, it will cause distortion or add black edges to your image. Moreover, Resizing an image does not change the content of the photo, but only its scale.

Part 2: How to Resize an Image on Windows and Mac

It's very easy to resize an image on Mac and Windows computers. They have a large screen, and the image resizer tools have an easy-to-use interface. Check some reliable ways to resize images on Windows and Mac.

1. How to Resize an Image in Photoshop

It's not difficult to use Photoshop when you just want to resize your image. You can use the free trials of this program to resize images for free. Check how to resize images on Mac or Windows with this professional program.

Step 1. Launch Adobe Photoshop and click the File button in the top left corner to import your image to this program. Click the Image button on the top ribbon. Then, select Image Size.

Step 2. In the pop-up dialog, you should enter new widths or heights to resize the image. You can upscale or downscale the image. Then, click the OK button.

Step 3. Finally, you just need to click the File button on the top left side. Then, click the Save As button to export your resized image to your Windows or Mac computer.

2. How to Resize an Image with GIMP

If you want to resize an image on Windows and Mac for free, GIMP is definitely a good choice. It's a free and open-source image editing program. You can view it as a good and free alternative to Adobe Photoshop.

Step 1. Download, install, and launch GIMP on your Windows or Mac computer. Then, click the File button in the top left corner. Then, click the Open button to import the image that you want to resize.

Step 2. Just like in Adobe Photoshop, you should click the Image button on the top ribbon. Then, click the Image Size button to start resizing your image (upscaling or downscaling).

Step 3. InF the Image Size window, you should enter new widths and heights. When you enter a value in either box, the other one will automatically change to the corresponding value based on the original aspect ratio of your image. Then, click the OK button to resize the image with GIMP.

Step 4. Finally, you just need to click the File button in the top left corner, and then click the Save a Copy button to export the resized image to your Windows or Mac computer.

Part 3: How to Resize an Image on iPhone and Android

Today, many people are used to using mobile phones every day. Maybe you don't have a computer near you. Therefore, it's also very necessary to know how to resize an image on an iPhone or Android. Note that the default Photos app on your phone cannot help you resize images. It can only help you change the aspect ratio or crop your image. Therefore, you need to rely on third-party apps to resize images on iPhone or Android.

1. Photoroom on iOS and Android

Photoroom is a popular and powerful app on iOS and Android that can help you easily resize images. It has an intuitive interface with easy workflow. Moreover, it can help you quickly resize images for Instagram and other social media. Check how to resize an image with Photoroom.

Step 1. Open the Photoroom app on your iPhone or Android and go to AI tools at the bottom of the screen. Here, you should select the Resize tool and add your image to this app.

Step 2. Then, you can select a preferred output size from dozens of preset options. It offers presets to help you resize images for social media, websites, and other platforms. You can upscale or downsize your image.

Step 3. After your selection, Photoroom will automatically resize your image with AI. Then, you just need to tap the OK button to start downloading the resized images to your phone. You can also edit images before downloading.

2. Image Size on iOS and Android

Image Size is a free and powerful image resizer app. It's lightweight and effective. If you only need to resize an image to 4K resolution or downsize your image. This dedicated app is definitely your best resort.

Step 1. Open Image Size and tap the Image button on the top left side to select the photo you want to resize to this app.

Step 2. Then, at the top of the window, you can see the current resolution of your image. You can enter new widths and heights to resize the image. You will directly preview the changes.

Step 3. When you are satisfied with the size, tap the Download button to save the resized image to your iPhone or Android.

Part 4: How to Resize an Image Online

When you use a computer, the easiest way to resize an image is to use an online image resize tool.

1. Apeaksoft Free Image Upscaler

Apeaksoft Free Image Upscaler is your best resort. It can quickly upload and process your images. You can also upscale multiple images in a batch without distortion or pixelation. When you want to upscale images, it is your best option.

Step 1. Go to the official website of Apeaksoft Free Image Upscaler and click the Upload your photo button to upload the image you want to upscale.

Step 2. You can resize your image to 2x, 4x, 6x, and even 8x. Choose your desired value and click the Save button to download the resized image to your computer.

2. Canva

Canva is a popular online image and photo editing platform. It has advanced editing techniques, practical features, such as Canva Background Remover, and stable performance. Check how to resize an image in Canva without losing quality.

Step 1. Go to the official webpage of Canva Image Resizer. Click the Upload your image button to upload the image you want to resize.

Step 2. Then, you don't need to edit your image. Click the Download button on the top right side. Then, you can drag the Size slider to resize your image. Then, click the Download button to download the resized image to your computer.

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