To fit precise upload dimensions, you will need to resize an image.

There are a large number of image editing tools you can use to resize photos. Professional programs like Adobe Photoshop can help you change picture size without losing quality. What’s more, many online image resizers offered on the market can increase or decrease your image size quickly.

If you have trouble uploading an image file due to its wrong size, you can use the seven apps below to freely resize an image file on your Mac, Windows PC, iPhone, or Android phone.

Part 1. How to Resize Images Online for Free

If you don’t want to install any third-party image editor programs on your device or only have a few pictures to resize, you can try using a free online image resizer to change the image size. One significant advantage of online image resizers is that you can use them on both computers and mobile phones. If you don’t know which online tool you should use, this part introduces you to 3 easy-to-use image resizers to select from.

How to Resize an Image with Apeaksoft Free Image Upscaler

Apeaksoft Free Image Upscaler is a popular online image resizing tool mainly designed for enhancing JPG and PNG pictures. It can automatically enhance image quality, upscale picture resolution, get rid of background noise and blur, and resize an image without losing quality.

• It has no feature limits and is 100% free.
• You can use it to resize an image file on a Mac, Windows PC, iPhone, iPad, or Android device.
• It adopts advanced AI technology and deep learning algorithms, which enable you to resize your pictures and optimize the output image quality freely.
• You can easily access this free image resizer on any commonly used web browser, including Google Chrome, Edge, IE, Firefox, Yahoo, and Safari.

You can follow the steps below to resize images online for free:

Step 1. Go to this AI image resizer's official website, and click the Upload your photo button to add your image file. It supports image files in JPG, JPEG, BMP, TIF, TIFF, and GIF.

Step 2. It will automatically upscale the image resolution and enlarge it to 2x by default. It also offers other options for changing the image size according to your needs. You can view and compare the source picture and the resized image.

Step 3. Click Save to export it to your device.

How to Resize Images with BeFunky Free Online Image Resizer

BeFunky is an all-in-one online photo editing and graphic design tool. It has an individual Free Online Image Resizer for you to change your image file size and dimensions. It can change pixels to inches and resize images for print. BeFunky's Photo Editor can also scale images by percentages and maintain the source aspect ratio of your images. It is compatible with JPEG/JPG, PNG, GIF, and BMP formats.

Below are the steps to resize image pixels online with BeFunky:

Step 1. Click the Upload Your Photo Now button on its website to upload your image file. You can also drag and drop a photo into its interface.

Step 2. You can directly increase or decrease the image's Width and Height to change the picture size. Or you can resize an image by adjusting its X-Scale and Y-Scale. Click the Apply button to save your changes after a real-time preview of the resized picture.

Step 3. Click the Save button and use your preferred way to save it. You can rename your picture, select an output format, customize quality, and add a personal watermark.

How to Use iLoveIMG to Resize Images Online

iLoveIMG is a famous online photo editor with various image editing tools, including Resize IMAGE, Compress IMAGE, Crop IMAGE, Convert IMAGE, Watermark IMAGE, and more. To resize an image file online, you can go to its official website and select the Resize IMAGE tool.

How to resize photos online via iLoveIMG:

Step 1. Go to its official website and click the Resize IMAGE button on the main interface.

Step 2. Press the Select images button to upload your images. iLoveIMG online image resizer supports JPG, PNG, SVG, and GIF formats. It lets you change picture size by defining the new height and width in pixels. You can upload image files from your device, Google Drive, or Dropbox.

Step 3. When your picture is uploaded, you can freely resize it by pixels or percentages. Its Percentage solution only allows you to shrink the image size to 25%, 50%, or 75%. You can tick Maintain aspect ratio and Do not enlarge if smaller based on your need.

Part 2. How to Resize an Image Using the Built-in Tools on Windows/Mac

How to Free Change Picture Size on Windows 11/10

To free resize an image on a Windows computer, you can rely on its built-in photo viewer, Photos. It is equipped with some essential editing functions, including image resizing. As an image resizer, Photos enables you to resize an image file in JPEG, PNG, ICO, RAW, PANO, TIFF, or GIF.

Step 1. Open your image file in Photos.

Step 2. Click the 3-dots button in the top-right corner to access its Resize function. Choose it to raise a Resize Image dialog.

Step 3. Use its Define custom dimensions option to change your picture size freely.

How to Free Resize an Image on Mac

You can use the recommended image resizers online above to change the picture size on your Mac. Also, you can use its default photo viewing tool, Preview, to resize an image easily. Preview supports many frequently used image file types, such as JPEG, PNG, PSD, and TIFF.

Step 1. Locate the image file you'd like to resize on your Mac and open it using Preview.

Step 2. Click Tools on the top menu bar, and choose the Adjust Size option from its dropdown. That will display a new Image Dimensions window.

Step 3. Preview allows you to resize an image on your Mac by changing Width and Height. You can also customize the image resolution and other settings. Tick the Scale Proportionally checkbox to keep the source image ratio. After changing the picture size, you can click the top File menu and use its Save function to store this resized image file on your Mac.

Part 3. How to Resize an Image in Photoshop

Adobe Photoshop must be the most popular image editor that carries all the necessary editing functions you may need. Indeed, it offers an image resizing feature to customize the size of your pictures without quality loss. If you have Photoshop installed on your Mac or Windows computer, you can follow the steps below to resize your image files. Or you can download the 7-day free trial of Photoshop.

Step 1. Launch Photoshop and open your picture in it. You can click on the top File menu and select the Open option to browse and add your image.

Step 2. If you need to resize images using Photoshop, please click the Image menu and then go to Image Size. That will raise an Image Size dialog.

Step 3. In the pop-up Image Size window, you can change the image width and height to customize the pixel size in units of measurement. In this step, you can also adjust the image resolution and resample based on your needs. Click the OK button to confirm your operation. After that, you can use the regular way to export this resized image file to your computer.

Part 4. How to Resize Images on Mobile

To resize an image on your mobile phone, you can rely on the built-in image cropping tool in the Edit menu of the Photos app. But this feature only allows you to shrink the image size. If you are not satisfied with the cropping way, you can find some associated image resizer apps from the App Store or Google Play Store. This part takes the popular Image Size app as an example to present how to resize photos on your portable iOS and Android devices.

Step 1. Download and open the Image Size app on your iPhone or Android phone. Give the app authority to access your photos and then open the photo you want to resize.

Step 2. Tap Width and Height, and enter new pixels to resize the picture based on your needs. After resizing an image file, you can use its editing features to optimize its output effects.

Step 3. Tap the Download button in the bottom-left corner to save this resized photo on your mobile phone. You can also generate a link for sharing, send it via email, or directly print it.

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