Image Viewing Apps For Mac Rating: 5,8/10 3945 reviews

Download and install the best free apps for Image Viewers on Windows, Mac, iOS, and Android from CNET Download.com, your trusted source for the top software picks.

Batch photo edits made easy
  • Dec 17, 2017 Sequential is a slick and good looking image viewer for Mac OS X. It supports all common image formats including jpg, PNG, GIF. Additionally, Sequential can open files in ZIP, RAR and PDF format. One of the unique features of Sequential is that it can open CBZ and CBR formats that are used for digital comics.
  • Double click the image under the Study List you would like to view in the Image Viewer, or from the Image Viewer, click and drag the image (when the study list is visible after clicking the “Expand Study List” icon) you would like to view to the Image Viewer (or to the desired location if in a multiple image layout).
  • Download and install the best free apps for Image Viewers on Windows, Mac, iOS, and Android from CNET Download.com, your trusted source for the top software picks.
Get PhotoBulk to edit and watermark your photo gallery.

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

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:

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  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.

Bulk resizer for Mac

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.

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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

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.

Certain actions that you perform on your Mac will cause default apps to open. For example, clicking a document may open Pages. But what if you want Microsoft Word to open instead? You can also set your default web browser and email reader.

Here's how!

How to change the default Mac app for specific file types

  1. Right-click on a file that uses the file type you'd like to change the default for. For example, one with a .jpg extension (a photo).
  2. Click on Get Info in the pop-up.
  3. Click Open With if the section isn't already expanded.

  4. Click the dropdown and choose an app.

    Source: iMore

  5. Click Change All..

  6. Click Continue when the Finder asks you if you're sure.

    Source: iMore

Now any time you open a file with that extension, the Finder will automatically open it with the app you've selected.

How to set your default web browser

  1. Launch System Preferences from the dock, Finder, or by clicking the Apple icon in the Menu bar.
  2. Click General at the top left of the window.
  3. Click the dropdown next to Default web browser.

  4. Click the web browser you'd like to use as the default.

    Source: iMore

How to set your default email reader

Mail is likely the default email app on your Mac, but just in case you have others downloaded, you can set the default reader. Here's how:

  1. Launch Mail from your dock or the Finder.
  2. Click Mail in the menu bar at the top of the screen.
  3. Click Preferences.
  4. Click the dropdown next to Default Mail Reader.

  5. Click the app you'd like to set as the default.

    Source: iMore

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