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4 Ways To Resize Images You Probably Don’t Know About

By Shirley, Last updated: August 27, 2019

You probably encounter the situation that your email rejects the instruction to upload your images as an attachment just because the images are lager than the limitation one email can accommodate. Or when you are signing up an account or filling up your personal information, you may find that you have to place your images sometimes. At all time, those images are limited and they have their own requirements. You have no alternative but to upload the images to meet such limitations and requirements.

Under those circumstances, you may need to know something about how to resize your images to make them suitable for the limitations and requirements. For instance, the image is oversize. Therefore, you may need to shrink down its size. Adding images into a zipped file seems to work here. Then, do you have any other workable ideas of how to resize images? Continue to read this article. There are 4 ways to resize images you probably dont know about. It is a complete guide for you of how to resize images on Mac.

I. Resize An Image Using PreviewII. Make An Image Smaller III. Crop An Image in PreviewIV. Batch Resize

I. Resize An Image Using Preview

  1. Choose An Image
    Choose the image you want to resize on your Mac.
  2. Open Image in Preview
    Open the image in Preview through double-clicking. If fail, right-click the image and then choose Preview under Open With....
  3. Select Tools.
  4. Click Adjust Size
    The Adjust Size icon is in the bar shown with two opposite arrows in a square.
  5. Change Dimension
Resize Images Preview

Change one dimension on the mini window and other dimensions will be adjusted proportionally if you have ticked Scale proportionally. If not, you can set a particular dimension for your image. For example, the size 600 x 300.

II. Make An Image Smaller

Based on Part I, you can also make your image smaller. As you change the dimensions, the size of the image change meanwhile. And you can preview the changing size shown with MB or KB. This is the first way to make your images smaller.

The second method to make an image smaller is to set the quality of images when exporting.

  1. Export File
    Export the image though path: File > Export.
  1. Choose File Format
    You need to choose a file format among HEIC, JPEG, JPEG-2000, OpenEXR, PDF, PNG, TIFF. HEIC is a new file format. Differences of sizes exist among different file format. For example, among JPEG, PNG, and TIFF, sizes from small to large in turn are: JPEG< PNG< TIFF. Therefore, if you want a smaller image, you should choose JPEG as the file format.

Resize Images File Format

Resize without losing quality: Talking of the file format, if you want to make your image smaller but maintain its quality, you can choose HEIC, standing for High Efficiency Image Format. JPEG is double-size as HEIC but with the same quality.

  1. Select Quality
    After you choose the file format, you need to select the quality of the exporting image. There is a quality bar provided for you to decide the quality. It ranges from Best to Least. Of course, this change also determines the size of the exporting image. You can preview the size at the bottom of the mini window.

Resize Images Quality

  1. Save Your Changes
    Since you have adjusted the quality of the image, press the Save button to conform to export the image.

The third method to make your images smaller is to use the FoneDog’s free online photo compressor. Using this tool, you have no need to download and install third-party software on your Mac, as it is a free online tool to compress JPEG and PNG files. At one time, you can compress up to 20 images and the maximum for each image is 5 MB. You can get this tool directly go to the FoneDog s official website.
Resize Images Photo Compressor

III. Crop An Image in Preview

  1. Choose A Picture on Mac
    Right-click the photos or picture you want to view on your Mac.
  1. Select Open with....
  2. Choose Preview.

Choose Preview as the tool to view your photos on your Mac.

Now you can view the pictures in Preview.

Tips: Via the steps above, you can also view PDF files on your Mac.

  1. Hit the Show Markup Toolbar
    You can see the Show Markup Toolbar is on the top-right side. Hit this icon.
  2. Adjust and Crop Pictures
    Then, tools including Selection, Sketch, Color Adjust, and Text are expanded. Now you can start to crop your pictures. You can adjust the size to crop your pictures.
  3. Crop The Picture
    Press Command + K to crop the image.

Resize Images Crop

IV. Batch Resize

If you have plenty of images to resize, you can choose to batch resize.

  1. Choose All Image
    Choose all the images you want to resize in Finder.
  2. Open Images in Preview
    Open the images in Preview through double-clicking> Preview> Open With....
  3. Select Tools.
  4. Click Adjust Size
    The Adjust Size icon is in the bar shown with two opposite arrows in a square.
  5. Change Dimension

Change one dimension on the mini window and other dimensions will be adjusted proportionally if you have ticked Scale proportionally.

The size of the images in total will be shown in Resulting Size below.

  1. Press the OK button.
  2. Save The Images

Click File> Save or press Command + S to save the adjustment of the images.
Resize Images Batch Resize

As what has been mentioned above, there are quite a few useful methods for you to resize your images on Mac. 4 main methods are provided for you above, you can choose one or more favorable means along with the corresponding steps to resize your images on Mac. For example, you can choose to change the file format or make your images smaller to resize your images.

If you just want to make your images smaller with no other requirements, you are better to have a trial on FoneDog free online photo compressor. It is far more convenient and much quicker than any other methods introduced to you. At last, hope you would resize your images in the needs you want with the methods above.

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