How to resize multiple images at once online

This tutorial will show you step by step how to resize multiple images at once online in a few different ways using free online tools (websites).

This tutorial will show you how to change the size (dimensions) and reduce the file size of your photos.

This works for all common image formats, such as JPEG (JPG), PNG, SVG, and GIF.

7 free online tools to resize multiple images at once

How to resize multiple images at once online using BulkResizePhotos

1. Open your web browser.

2. Go to https://bulkresizephotos.com.

3. Click on the Choose images button.

A “File Upload” window will appear.

4. Go to the location on your computer where the images are stored that you want to resize.

5. Select all images.

6. Click on the Open button.

7. There's a menu located at the top left of the page where you can choose a resize option.

You will have the following options:

Note: No matter which size you choose, the aspect ratio of your images will be correct. For example, if you choose a width of 800, then a photo with a size of 1280 x 720 will still get the correct aspect ratio of 800 x 450.

The aspect ratio of a picture describes the proportional relationship between the picture's width and its height. (1)

8. Enter the percentage or the width or height in pixels in the box.

Image resize options on bulkresizephotos.com

9. Click on the Start Resizing button at the bottom of the page.

BulkResizePhotos will now resize your images.

Your web browser will download a .zip file to the “Downloads” folder on your computer. This zip file contains your images and you will have to unzip the zip file to extract your images.

How to resize multiple images at once online using ILoveIMG

1. Open your web browser.

2. Go to https://www.iloveimg.com/resize-image.

3. Click on the Select images button.

A “File Upload” window will appear.

4. Go to the location on your computer where the images are stored that you want to resize.

5. Select all images.

6. Click on the Open button.

7. At RESIZE OPTIONS located at the top right of the page, you select one of the following two resize options:

Note: No matter which size you choose, the aspect ratio of your images will be correct. For example, if you choose a width of 800, then a photo with a size of 1280 x 720 will still get the correct aspect ratio of 800 x 450.

The aspect ratio of a picture describes the proportional relationship between the picture's width and its height. (1)

8. Select the percentage or enter the width or height in pixels in the box.

Image resize options on iloveimg.com

9. Click on the Resize IMAGES button at the bottom of the options menu.

ILoveIMG will now resize your images.

Your web browser will download a .zip file to the “Downloads” folder on your computer. This zip file contains your images and you will have to unzip the zip file to extract your images.


Related: How to resize multiple images at once in Windows 7, 8, and 10


How to resize multiple images at once online using Birme

1. Open your web browser.

2. Go to https://www.birme.net.

3. Click on the BROWSE FROM YOUR COMPUTER button.

A “File Upload” window will appear.

4. Go to the location on your computer where the images are stored that you want to resize.

5. Select all images.

6. Click on the Open button.

7. At RESIZE / CROP located at the top right of the page, you select or enter the width or height in pixels.

If you want to give all images the same width, then you must check the Auto height option.

And:

If you want to give all images the same height, then you must check the Auto width option.

Select the width or height in pixels for the images on birme.net

Note: No matter which size you choose, the aspect ratio of your images will be correct. For example, if you choose a width of 800, then a photo with a size of 1280 x 720 will still get the correct aspect ratio of 800 x 450.

The aspect ratio of a picture describes the proportional relationship between the picture's width and its height. (1)

8. Click on the SAVE AS ZIP button.

Your web browser will now download a .zip file to the “Downloads” folder on your computer. This zip file contains your images and you will have to unzip the zip file to extract your images.


Related: How to resize multiple pictures in Windows without third-party software


How to resize multiple images at once online using PicResize

1. Open your web browser.

2. Go to http://www.picresize.com/batch.php.

3. Click on ➕ Add Multiple Files.

A “File Upload” window will appear.

4. Go to the location on your computer where the images are stored that you want to resize.

5. Select all images.

6. Click on the Open button.

7. Click on ⇧ Upload Files.

PicResize will now upload your images.

8. Under Set Resize Options, you select a percentage (e.g., 75%, 50% or 25%) or select Custom size and then enter the width or height in pixels (e.g., 1024).

Note: No matter which size you choose, the aspect ratio of your images will be correct. For example, if you choose a width of 800, then a photo with a size of 1280 x 720 will still get the correct aspect ratio of 800 x 450.

The aspect ratio of a picture describes the proportional relationship between the picture's width and its height. (1)

9. At Save As Format:, you select the output image format (e.g., JPG, PNG, or GIF).

Resize options for images on picresize.com

10. Click on the Submit Batch Job! button.

PicResize will now resize your images.

11. Click on Save to Disk.

Your web browser will now download a .zip file to the “Downloads” folder on your computer. This zip file contains your images and you will have to unzip the zip file to extract your images.

How to resize multiple images at once online using ImageResizerOnline

1. Open your web browser.

2. Go to https://imageresizer.online.

3. Click on Drag and Drop files Or click to select files.

A “File Upload” window will appear.

4. Go to the location on your computer where the images are stored that you want to resize.

5. Select all images.

6. Click on the Open button.

7. Under Resize (located below your images), you have the following two options:

Enter a size for your images on imageresizer.online

Note: No matter which size you choose, the aspect ratio of your images will be correct. For example, if you choose a width of 800, then a photo with a size of 1280 x 720 will still get the correct aspect ratio of 800 x 450.

The aspect ratio of a picture describes the proportional relationship between the picture's width and its height. (1)

8. Under Output > File Type (located below your images), you can select a image format (e.g., JPG, PNG, GIF, etc.).

9. Under Output > Quality (located below your images), you can select a quality. If you want the best quality then you should select 100.

File type and quality selection options on imageresizer.online

10. Click on the RESIZE button at the bottom.

Your web browser will now download your images to the “Downloads” folder on your computer.

How to resize multiple images at once online using ImageResize

1. Open your web browser.

2. Go to https://imageresize.org/bulk-resize.

3. Click on the Choose Images to Resize button.

A “File Upload” window will appear.

4. Go to the location on your computer where the images are stored that you want to resize.

5. Select all images.

6. Click on the Open button.

7. Click on the Proceed to Bulk Resize button.

ImageResize will now upload your images.

8. Under Resize your Images > Image Size, you click on the selection menu.

9. Choose one of the following options:

Resize options for images on imageresize.org

10. If you chose the “custom size” option, then you will need to enter a width or a height in pixels.

Custom size option for images on imageresize.org

Note: No matter which size you choose, the aspect ratio of your images will be correct. For example, if you choose a width of 800, then a photo with a size of 1280 x 720 will still get the correct aspect ratio of 800 x 450.

The aspect ratio of a picture describes the proportional relationship between the picture's width and its height. (1)

11. At Optimize Your Image (optional), you can choose a optimization level or a maximum file size. I would not use this option.

12. At Save Image As, you can select an image format (e.g., JPG or PNG) or Original (original image format).

13. Click on the Resize Images button at the bottom.

ImageResize will now resize your images.

14. Click on the Download Images button.

Your web browser will now download a .zip file to the “Downloads” folder on your computer. This zip file contains your images and you will have to unzip the zip file to extract your images.


Maybe you're also interested in:

How to resize multiple images at once in Windows 7, 8, and 10

How to resize multiple pictures in Windows without third-party software


Reference:

Wikipedia: Aspect ratio (image)