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Batch photo edits made easy
Get PhotoBulk to edit and watermark your photo gallery.

Double click on the image - this should open the image in Preview, if it doesn’t, close it and right click to choose Open With and select Preview. Choose Adjust Size (you can. Using an application to resize images: If you find it difficult to resize images using above methods or if you have a large number of images to play with then you must go for a third-party application. When it comes to image resizing applications for Mac Image resizer from Tweaking Technologies is the best app to resize images in bulk.

Images don’t always come in convenient sizes. Whether you’ve downloaded one from the web or taken one yourself in the hopes of using it for a project, resizing it to fit certain guidelines is often required.

However, aspect ratios are not the only concern. If we want to share the image via email campaign, use it on social media, or include it in a presentation, it needs to be small enough in file size, so it doesn’t create unnecessary problems for other people’s network connections and machines. Try emailing a 50 MB PDF file around the office and see the reaction that follows.

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How can you quickly change the size of an image and optimize it at the same time? Read on in our brief guide for manipulating images on your Mac.

How To Resize Images On Mac

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You have two easy options that allow you to resize images on Mac: either using the default Preview app or more advanced PhotoBulk.

Preview is built right into your Mac and mostly used for viewing images. But it’s also a feature-rich tool for manipulating images, including changing their size. Preview lets you control every detail, from the number of pixels to the dimensions in inches. You could also choose to transform the image as a percentage of the original or go completely custom. Finally, the app gives you an option to modify images according to a range of preset sizes, such as 640 x 480 pixels.

Here are the steps to resize an image in Preview:

  1. Open the image you want to modify
  2. Click on Tools and select Adjust Size
  3. Now you can adjust the Width, Height, and Resolution
  4. Once you’ve made those changes, make sure you’ve ticked the “Scale proportionally” box; otherwise you risk an image that is out of proportion and may not look very professional

Now the resized image will show in the Preview window, and you can keep trying out new sizes until you are happy with the end result. Go to File > Save to save the image with the original name or File > Rename if you want to keep the original (useful if you need to keep a high-resolution version) and apply a different name to this copy.

With Preview, you can also change the file format. Under File > Export, you have the following options: PNG, JPEG, JPEG-2000, OpenEXR, PDF, or TIFF. Some of these could potentially improve the quality of the formatting as well.

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PhotoBulk is a life-saver for when you need to change the size of multiple images. Drop them into the app and resize in a sec.

Another option is to use PhotoBulk, an image editor designed specifically for bulk resizing, but which can also be used to resize individual images. PhotoBulk puts all of the menu options in one convenient window, along with a real-time preview feature and the option to apply watermarks at the same time.

To resize an image with PhotoBulk:

  1. Open up the app
  2. Drag and drop your image onto the window
  3. Check Resize option from the left-side menu
  4. Select the type of resizing you need
  5. Click Start
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Resize multiple images at once

Sometimes you need to resize multiple images at once. Although probably not your best option, Preview does allow for batch resizing:

  1. In the folder with your images, select the ones you need to resize and then right-click on them, and choose Open With > Preview. This will open them all in Preview’s left sidebar.
  2. Select all the images inside Preview (shortcut: Cmd + A) and then go Tools > Adjust Size, just like in the steps outlined above
  3. When done, choose to either Save or Rename and then Save

The downside of using Preview for batch resizing is that you have to process all the images at the same time. PhotoBulk, on the other hand, provides much more control and the ability to modify the size of individual images without needing to apply those same dimensions to every image:

  1. Drag and drop a bunch of images into PhotoBulk
  2. Check the Resize box
  3. Use the dropdown menu to adjust images according to width, height, etc.
  4. In the same area, you can choose to rename files and their formats, as well as add a watermark if needed

Overall, whichever option you choose for resizing images, Preview or PhotoBulk, it should now be fairly easy for you to do so. Your best bet is probably to use Preview for single images and PhotoBulk for multiples ones. Just make sure you input the right dimensions and don't forget to save the original if you need to keep a higher resolution version for later. Best of all, PhotoBulk is available for a free trial through Setapp, a platform of over 150 useful apps and utilities for macOS. Another trick up your sleeve.

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Since the OS X El Capitan released, the Disk Utility, which comes bundled with any operating system, has changed significantly. The new application received a lightweight design, but on the other hand, the performance of some functions became unclear. Many are faced with a problem when trying to combine multiple logical drives into one.

Anyway, you can use Disk Utility on a Mac to manage internal disks and external storage devices.

Disk Utility

  • Monitor your data and manage it by splitting the disk into several parts, called partitions. In the Finder, each properly formatted partition is displayed as a volume;
  • Create a disk image – a single file with which files can be moved between computers, create backup copies and archive their work;
  • Check for errors on disks and volumes and fix them. If there are several volumes on the device and one of them is almost full, you can enlarge it without losing any data;
  • Reduced variation of working with RAID-arrays.

When a storage device is partitioned, it is divided into separate sections, which are listed in the “Devices” section of the Finder side menu as separate volumes. You may need to partition the disk if you want to install multiple operating systems or change the formatting of the device.

You can easily create new partitions on a device that has at least one volume containing data if there is free space on it and resize them too.

WARNING!!! It is recommended that you back up your data before creating new partitions on the device.

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Resize Volume

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If there are several volumes on the device and one of them is almost full, you can enlarge it without losing any data.

Increase Size

To increase a volume, you must delete the volume that is on the device after it, and then move the end point of the volume you want to increase to the free space. The last volume of the device cannot be expanded.

WARNING!!! When you delete a volume, all the data in it is erased. Before performing this operation, be sure to back up your data.

  • In the side menu, select the device that contains the volume you want to increase, then click the “Partition” button;
  • In the disk diagram on the left, select the volume you want to delete, then click the “-” button at the bottom, then click “Apply”;
  • The volume is deleted, reformatting is performed, and all free space is assigned to the previous volume;
  • Click “Done”.

Decrease Size

To decrease the size of the volume is about the same as described above:

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  • In the disk utility where the section disk diagram is shown, holding the “Cmnd” button and you should reduce the size of the volume to an acceptable value.

Conclusion

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Working with partitions is quite complicated and insecure. Often unknowingly, you can delete the necessary data. Therefore, I advise you not to rush and carry out all actions carefully. Ideally, to start working on a live system, it is worthwhile to train in a virtual system.