How to Resize JPEG Images

You need to change the JPEG file size when you want to send multiple images to email or upload to a website. Resizing an image will slightly degrade the quality, and enlarging the original image size can blur the image. You can resize photos using online tools, desktop editing software, or mobile apps, all for free.

Table of Contents

Using the Image Resize Website

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Go to the image resizing website. There are countless websites that allow you to quickly upload and resize photos, including JPEG format. Search by keyword “resize jpeg” to see different results. Using online tools works best on computers, not suitable for mobile devices. Here are a few popular sites:

picresize.com
resizeyourimage.com
resizeimage.net

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Load the JPG image you want to resize. Most websites allow you to upload photos visually. Click “Choose file” or “Upload image” or “Browse” to find the image file you want to resize on your computer.

If the image you want to resize is on another website, you just need to download the image to your computer and then upload it to the image resizing website.

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Use the resize control to resize the image. Each website has a different adjustment interface. You can click and drag and drop the dialog box or use the slider to adjust the size. You can enter the exact size you want in the corresponding field.

Enlarging the original image size reduces the image quality significantly.

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Select the compression level (if possible). Some resizing sites allow you to choose the compression level. The more compression, the smaller the file size but will reduce the image quality. Look for the quality slider or drop-down to change the final quality. Not all websites have the option to change the quality.

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Load the resized image. After setting the size and quality, you can resize and download the image to your device. Click the “Resize” button to load a new image. You will see the preview image before downloading.

When uploading a resized image, make sure you don’t overwrite the original. If you keep the original, you can edit it again if you are not satisfied with the result.

Using Paint on Windows

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Make a copy of the image file. Before resizing in Paint, make a copy so as not to affect the original file. If you keep the original file, you can edit it again if you are not satisfied with the result.

To make a copy of an image file, right-click the image and select “Copy”. Right-click an empty area in the same folder and select “Paste” to make a copy of the image.

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Open the image in Paint. Paint is free photo editing software that comes pre-installed on every Windows computer. Right-click the image and select “Edit” to open the file in Paint.

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Select all photos. If you want to resize the whole picture, select the whole thing by pressing Ctrl + A . You can click the “Select” button in the Home tab and select “Select all”. You should see a dashed line appear around the image border.

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Click the “Resize” button. You will see this button on the Home tab, or press Ctrl + W . This is to open the “Resize and Skew” window.

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Use the “Resize” field to resize the image. You can choose to resize in percentages or pixels. If you select “Pixels” you can enter the exact size you want to change. Or enter a percentage greater than “100” to enlarge the original image.

By default, Paint will maintain the aspect ratio, just enter a value in 1 field, the software will automatically calculate the remaining field. This way the image will not be stretched or distorted during resizing. You can uncheck “Maintain aspect ratio” if you want to manually enter both Horizontal and Vertical fields.
Enlarging the image compared to the original will cause the image to be blurred.

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Click “OK” to view the image after resizing. After clicking “OK”, your photo will be resized according to the value you entered. There is no preview function so you need to apply changes to see results.

If you’re not satisfied with the results, press Ctrl + Z to undo the resize you just made. You can click the “Undo” button at the top of the page.

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Drag the edges to fit the photo to the new size. The image will resize, but the edges will remain the same size. Click and drag the box around the edges to resize and remove white space.

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Save the resized image. Once satisfied with the new size, you can save the file changes. Select “Save As” in the File tab and select “JPEG picture”. You can name the file and choose a save location.

Using Preview in Mac OS X

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Make a copy of the image file. It is best to back up the original image before resizing. Thus, you can edit it again if you are not satisfied with the results. Select the photo, press ⌘ Command + C and ⌘ Command + V to make a copy in the same folder.

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Open the photo in the Preview app. Usually you just need to double click on the image and the default image opens in Preview. If the photo is open in another application, you can right-click and select “Open With” and select “Preview”.

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Click the Tops menu and choose “Adjust Size” . This is the operation that opens a new window that allows you to adjust the image size.

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Click on the drop-down menu to select the unit you want to use. You can select “Pixels”, “Percentage”, and other image measurement units. Selecting “Pixels” allows you to decide the exact image size after adjustment.

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Enter the new width and height of the photo. These two fields are linked together, so if you change one field, the software will automatically calculate the other field. This way the image will not be stretched or distorted. If you want to freely change both fields, uncheck “Scale proportionally” to unlink the two fields.

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Check the new size of the file. You can see the new size at the bottom of the window before you apply the change. This is useful if you want to resize your photos to fit your email or other hosting service’s upload limit.

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Click “OK” to apply the change. The photo will be resized according to the settings you set. If not satisfied with the result, press ⌘ Command + Z to undo the change and return to the original size.

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Save file. If you are satisfied with the new image size, you can save the file changes. Click the “File” menu and select “save” to save the changes. ^{[1] X Research Source}

Using an iPhone, iPad, or iPod Touch

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Install an app that allows you to resize photos. There is no built-in image resizing feature on iOS devices, but you can use an intermediary application to do that. You can get these apps on your iOS device’s App Store. Here are some popular applications:

Resize It
Image Resizer+
Desqueeze

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Open the app and select the photo you want to resize. The app will ask you for permission to access the photo. This is required for the app to access your device’s photo storage. Find the photo you want to resize and open it.

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Click the “Resize” button. Most apps have multiple tools, including resizing. Click the “Resize” button to proceed with resizing the image.

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Enter the new size of the photo. Different apps will look different, but you can choose the available size or enter your own resolution. Horizontal and vertical are linked together to maintain the aspect ratio of the image.

If you’re not afraid of the image being stretched or distorted, you can click on the link string or keychain button to enter different values for each field.

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Save resized image to rpl camera. After adjusting the image size, click the “Save” button to save the image to the rpl camera. You can search in the Photos app just like other photos on your iOS device.

Using an Android device

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Get an app that can resize photos. Android devices don’t have the ability to resize photos, but there are tons of other apps that can do that for you. You can find the app on the Google Play Store, which is usually free to download. Here are some common uses: ^{[2] X Research Sources}

Photo & Picture Resizer
Resize Me!
Image Shrink
Reduce Photo Size

Warning

The image will lose quality significantly if you enlarge it. It’s best to just reduce the image size. When you enlarge the image, you stretch the pixels, so the image will be blurred and poor quality.

Steps