How to shrink JPG

Do you need to reduce the size of a series of images in JPG format stored on your computer, smartphone and / or tablet, in order to be able to share them in a more practical and immediate way via email, WhatsApp and so on and so forth? If the answer is yes, I am happy to announce that you have landed on the right guide, at the right time. Today, in fact, I decided to explain to you how to reduce JPG , both by resizing your files and compressing them.

How do you say? You are interested in this, but being impractical on what to do, do you fear that the operations to be implemented may be too complicated for you? Well, know that you are wrong … and very wrong too. Contrary to appearances, everything is very simple, you just need to understand which tools to use and where to put your hands and that’s it. I already anticipate that there are several ad hoc software for both Windows and macOS, online services that can be used from any platform and specific apps for Android and iOS / iPadOS.

So if you are really eager to know more, I suggest you take a few minutes of free time just for yourself, get comfortable and concentrate on reading this guide. I am sure that in the end you will be able to tell yourself very happy and satisfied, both with what you have learned and, obviously, that you have finally succeeded in your intent. Now, however, let’s ban the chatter and proceed!


  • How to reduce JPG size: Windows
    • Paint 3D
    • IrfanView
  • How to reduce JPG size: Mac
    • Preview
    • ImageOptim
  • How to reduce JPG size: online
  • How to reduce JPG size: Android
  • How to reduce JPG size: iPhone

How to reduce JPG size: Windows

Do you want to find out how to reduce JPG and are you using a Windows PC ? Yup? Then turn to the tools listed below, following the relevant instructions for use.

Paint 3D

The first of the useful tools to reduce JPG with Windows  that I want to advise you to try is Paint 3D . As easily understood by the name, this is the evolution of Microsoft ‘s “classic” Paint , but compared to it it offers a whole series of new functions, in particular for what concerns 3D design. It is free and is integrated in Windows 10 and later, but if not available or removed it can be downloaded from the relevant section of the Microsoft Store .

To be able to reduce JPEG with Paint , therefore, start the program by clicking on the Start button (the one with the Microsoft logo ) on the taskbar and then selecting the relative link attached to the menu that appears. Once the Paint 3D window is displayed, click on the Open button and select the image in JPG format on which you want to go to act.

At this point, click on the Drawing Area button at the top, select the Resize image with the drawing area option , decide whether to adjust the size of the image in pixels or as a percentage using the appropriate drop-down menu, whether or not to lock the aspect ratio using the dedicated option and type the dimensions you want to assign to the file in the Width and Height fields . Alternatively, you can resize the image by moving the selection rectangle.

If, on the other hand, you want to crop the image, perhaps because you want to reduce JPG photos to passport photos , select the Crop tool that you find on the toolbar at the top, adjust the size of the selection rectangle, dragging it on the image or using the options that you find in the menu on the right, decide whether or not to lock the aspect ratio using the dedicated option and click on the Finish button .

In all cases, save the modified JPG file by clicking on the Menu button at the top left, then on the Save item (to overwrite the current file) or on the Save As item (to save the modified image as a new file ) that you find in the menu that opens.


Another tool you can consider relying on to reduce JPG size for free  on Windows is  IrfanView . It is a totally free and easy to use software that acts first of all as an image viewer, but which also integrates a whole series of useful tools and functions to resize and compress photos, even acting in batches.

To download the program on your PC, go to its website and press the Download button that you find in correspondence with the 64-bit or 32-bit item (depending on the version of Windows you are using).

When the download is complete, open the .exe file obtained and, in the window you see appear on the desktop, click on the Yes , Next (four consecutive times) and Done buttons , to complete the setup.

By default, the program does not have an interface translated into Italian. To remedy this, you must also download the translation file by visiting this other web page and clicking on the Installer link that you find under the Italian item. Then, close the IrfanView window displayed on the screen, open the .exe file you just obtained and, in the screen that appears on the desktop, click on the Yes , Install and OK buttons .

Then restart the software using the shortcut added on the desktop, then select the Options menu located at the top of the IrfanView window that is shown to you, click on the Change language item , select Italian from the list of available languages ​​and press on the OK button .

At this point, you can finally take the real action. So, if you want to resize an image in JPG format, open it by clicking on the File menu at the top left and then on the Open item , then click on the Image menu that you will always find at the top and choose the Resize / resample option from the latter.

Using the additional window that opens, indicate the size you intend to assign to the photo by selecting the Set new size option and specifying the width and height in the dedicated fields. Alternatively, you can resize the image by defining the percentage, megapixels, choosing one of the available presets and adjusting the various other available settings related to resampling, aspect ratio etc.

Then, click on the OK button and save the modified photo by clicking on the File menu and on the item Save (original folder) (to overwrite the source file) or Save as (to create a modified copy of the image).

If, on the other hand, what you are interested in doing is cropping the image, indicate the area of ​​the same you want to leave unchanged by drawing a selection rectangle, click on the Options menu , choose the item JPG crop without losses from the latter, indicate the folder where you want to save the output file by pressing the Browse button in the window that opens and press the Start button .

Are you interested in understanding how to compress your JPG files? In this case, click on the File menu , then on the Convert / rename to series item present in it and, in the window that opens, select the Convert to series option  in the Task to perform section .

Next, set the JPG format in the Destination Format drop-down menu   and click the adjacent Options button . In the further window that opens, adjust the compression level of the images using the appropriate bar located next to the Level item .

Once the changes are complete, click on the OK button , drag the JPG images to be compressed into the box at the bottom right of the IrfanView window, select the folder in which to save the output files by pressing the Browse button and start the procedure by clicking on the Start Batch Action button .

How to reduce JPG size: Mac

Now let’s move on to the Mac side and find out how to reduce JPG in this case. To find out more, read on. You will find everything explained in detail below.


Preview is the default macOS application through which it is possible to view images and PDF files and make some basic changes to the graphic files that are given “at the table”. Given its characteristics, it is also useful for carrying out the operation covered by this tutorial.

To use it for your purpose, double-click on the icon of the JPG file you wish to act on, in order to open it directly in Preview. If a different program opens in doing this, it is evidently because Preview is no longer the default application for managing images. To restore the association, you can follow the instructions in my guide on how to change a default program .

Subsequently, if you need to intervene on multiple images, call up the sidebar with the thumbnails of the Preview window, by clicking on the View menu located at the top left and on the Thumbnails item that you find in the menu that opens. Next, select all the thumbnails of the images, using the combination cmd + a on the Mac keyboard.

Now, if you want to reduce the size of the image, click on the Tools menu , then on the Adjust size item present in it and intervene on the options attached to the panel that opens to indicate the dimensions you want to assign to the photo, specifying height and width, the resolution or by choosing one of the available presets. To save the changes, click the OK button and close the window.

If, on the other hand, what you want to do is to change the degree of compression of the image, click on the File menu , select the Export / Export selected images item , choose the location in which to save the output files through the additional screen that you is proposed, choose the JPG option from the Format drop-down menu , adjust the image compression level by moving the cursor next to the Quality item and press the Save button .


If you are looking for some other solution by which you can reduce JPG size on Mac , I strongly suggest that you consider using  ImageOptim . It is a free and specific application for Apple-branded computers which, as can be easily deduced from the name itself, allows you to compress images in JPG format, as well as PNG and GIF.

To download it to your Mac, visit the program’s website and click on the Download for Free button located in the center.

When the download is complete, extract the resulting compressed archive and drag the software icon to the Applications folder of macOS. Then right-click on it and select the Open item twice in a row, in order to circumvent the restrictions applied by Apple to non-certified developers (an operation that must be carried out only at the first start).

Now that you see the program window on your desktop, drag the JPG files you want to compress onto it or select them “manually” by pressing the (+) button . Once this is done, the compression procedure will start automatically and when it comes to an end the original images will be overwritten and you will be shown the compression percentage applied to them in the Savings column .

If you see fit, you can compress your JPG files even more by selecting them and then clicking the Anchor button . You can repeat this last step even more than once. If, on the other hand, you want to change the compression level, click on the button with the gear wheel at the bottom and intervene through the Quality tab in the window that opens.

How to reduce JPG size: online

If you do not want or cannot download and install new software or use those on your computer, consider reducing JPG by using special Web services, such as those offered by iLoveIMG . It allows you to both resize and compress images, it’s easy to use and it’s free. Note, however, that there are restrictions on the maximum size of files that can be uploaded. To cope with this, you need to subscribe to a paid subscription (costs 4 euros / month) which also allows you to unlock other extra functions. Furthermore, the privacy of users is protected as the files uploaded to the service are automatically removed from the servers of the latter after a few hours from the upload.

To use iLoveIMG to resize a JPG file, visit this web page and drag the JPG files to resize into the browser window or press the Select images button to select them “manually”. You can also get images from Google Drive and Dropbox by clicking on the relevant buttons.

Through the next screen, if you want to resize the images in pixels, choose the In pixels option , fill in the Width (px) and Height (px) fields with the dimensions you want to assign them and select or deselect, according to your needs and preferences, the options Keep aspect ratio and Do not enlarge if the original is smaller . If, on the other hand, you want to resize the images in percentage, click on the item In percentage and choose the option you prefer.

Finally, click on the Resize images button and then on the Download resized images button to proceed with the download of the output files. You can also decide to save everything on supported cloud storage services or to share them via link, by clicking on the appropriate buttons.

If, on the other hand, what you want to do is compress your JPG files, go to this other web page , upload the images proceeding as I have already explained, press the Compress images button and proceed with the download of the files. output.

How to reduce JPG size: Android

Would you like to understand how to reduce JPG by operating from your Android smartphone or tablet ? I’ll settle you immediately! To do this, you just need to resort to the use of special apps. Among the various available, I recommend  Photo Compress 2.0 , which is completely free and allows you to resize images by reducing their size, cropping and / or compressing them.

To download and install it on your device, visit the relevant section of the Play Store and press the Install button (if Google services are missing on your device, you can download the app from alternative stores ). Then, start Photo Compress 2.0 by selecting the relative icon that has been added to the home screen and / or to the drawer.

Now that you see the main screen of the app, tap the Gallery button , grant the app the required permissions and select the image to compress. Then, press the Resize button (to resize the image), the Crop button (to crop it) or the Compress button (to compress it), depending on your needs.

Therefore, adjust the related options that are proposed to you and tap again on the button with the name of the operation to be performed to apply the changes. Then press the Exit button to save the edited JPG file in the Android Gallery.

How to reduce JPG size: iPhone

If, on the other hand, you have an iPhone (or an iPad , it makes no difference), to reduce JPG I recommend using the Foto Compress app  . This is a free application through which you can reduce the weight of images quickly and easily. Basically it’s free, but in-app purchases are offered (at a base cost of 2.99 euros) to remove advertising and unlock other extra features.

To download and install the app on your device, visit the relevant section of the App Store , press the Get button , then the Install button and authorize the download via Face ID , Touch ID or Apple ID password . Then, start the application by selecting the relative icon that has been added to the home screen and / or to the App Library.

Now that you see the main screen of the app, choose whether or not to allow the sending of notifications and tap the Non-personalized advertising button , so you can continue using the app for free, displaying ads not based on your identifier. Having made your choice, refuse the installation of additional software by tapping the No thanks button .

To select the image to reduce, tap the (+) button located at the top and the Allow and Allow access to all photos buttons , in order to authorize the app to access the stored images.

Then proceed to adjust the image quality by moving the slider on the bar under the item Image quality on the next screen and, if you intend to intervene also on the actual size of your photos, move the slider that you find on the bar under the item Reduce image size for .

Finally, view a preview of the final result by clicking on the Preview button . If you are satisfied, tap the Continue button and proceed with saving the compressed image directly to the iOS photo album.


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