Your Mac’s Preview app doesn’t just contain PDF-editing features.It’s a great little image editor, too. Preview offers basic tools for cropping, resizing, rotating, annotating, and otherwise tweaking images. In fact, Preview app for Mac has many advanced image adjustments and editing functionalities, including the ability to increase color saturation, convert images to black and white, crop pictures, batch resize multiple images, batch convert image file types, and much more. PhotoResizer is a lightweight photo resizing tool to resize thousands of photos quickly at the same time, resize your image larger or smaller with original aspect ratio by percentage or by your custom size avoiding image morph. It's absolutely the most deserving photo resizing tool! Using this tool, you can select photos from Photos Library, Photos or from any folder on your machine. Get the all new Image Resizer app and be assured that you have the best tool to resize, crop, rotate, flip any image to any direction or convert it to any other format.

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A lot of us will unanimously vouch that iPhoto 11 is the best way for Mac users to manage, edit, and share photos, but some Mac users may not take enough photos to warrant purchasing or bothering with the program. In addition, you may simply need to quickly resize images without bothering to open iPhoto, which sometimes can mean opening a huge library of thousands of images.

For more streamlined purposes, Apple’s default OS X applications, Preview and Mail, and a free lite version of a third party application called ResizeIt may suffice. If you, on the other hand, need to do batch resizing of images, check out my article5 Quick & Easy Mac Automator Hacks for Digital Photos5 Quick & Easy Mac Automator Hacks for Digital PhotosRead More on using Automator for this purpose.

Resizing In Preview

By default, when you double-click on an image on your Mac, Preview is the application that opens it up. What you may not know is that it’s also a good application for resizing images. To do so, open an image into Preview, and click Tools > Adjust Size in the menu bar.

The drop-down window will provide you information about the dimension and resolution size of the image. For images you’re going to post for viewing on a website, the resolution size 72-150 pixels is adequate. For printing purposes, 240 to 300 pixels should be used. You should manually type in the dimension for resizing your image.

Or you can use one of the presets provided in Preview. It used to be that 640 x 480 pixels was the standard size for posting images on the web, but with many people viewing the web on widescreen monitors and small mobile phones, you might need to consider other sizes, such as 800 x 600 or the smaller 320 x 240. Unfortunately, Preview doesn’t allow you to save custom sizes as a preset. If you have a custom size you need to regularly use, create an Automator workflow5 Quick & Easy Mac Automator Hacks for Digital Photos5 Quick & Easy Mac Automator Hacks for Digital PhotosRead More or use ResizeIt described below.

Caution: when you resize images in Preview it will not give you the option to save the original of your image. So you need to either make a duplicate copy of the photo before resizing, or select Save As to make sure you’re saving the resized image as a separate file.

Resizing In Mail

If you want a super fast way to resize an image(s), simply drop it into your Apple Mail application and mail it. Done. Mail even provides you with options for resizing.

At the bottom of the composition box, Mail will tell you the dimensions of the resized photo before you mail it. You can change it to Small, Large, or Actual Size, provided the recipient of your email has a fast enough Internet speed to download a large size image file.

The great thing about using Mail to resize an image is that it doesn’t resize your original. It makes a copy and then resizes it. However, if you try to drag the image out of your drafted email, it will not be the resized version.

The best way to lessen the size of a PDF is to compress image files in that PDF and a compressor does the same! Here is a list of the best PDF compressors for both Mac OS X. There is a built-in tool to archive files on Mac. To unzip a file on Mac, there are Mac un-archiver apps those can unzip files on Mac. See the list of best mac compress and unzip tools that you can use. Here is the list of Best File compression Tools and file compressor software for Windows, Linux, Mac Android and iPhone. This file compressors help to reduce size of large files. Here is the list of Best File compression Tools and file compressor software for Windows, Linux, Mac Android and iPhone. Mac compression software.

Resizing In ResizeIt

If you don’t want to haul out iPhoto or Photoshop to resize an image, and if you need to do some quick batch resizing of images, a small free application, ResizeIt available in the Apple Mac Store, may do the trick. Now I must say, ResizeIt could use some work, although it does what it says it will do.

The best way to use ResizeIt is to select, then drag and drop one or more photos onto the ResizeIt icon in your Dock. From there you will be presented with a dialog box in which you configure the settings you need. Be sure to leave the Overwrite Files box unchecked if you don’t want to resize your original image(s). If you leave the “Choose the folder to save images” unchecked, ResizeIt will resize, save, and put your images into a folder for you.

You can also save various sizes as presets. The application worked OK for me. I do think however that the pixel boxes should start with “W” and then “H”, for that’s typically how dimensions are set in image applications. The first number is usually the width and the second is height. But ResizeIt is a free application, so not much to complain about. It’s a useful program for quick batch resizing.

Finally, if you click on Script > Generate Droplet, ResizeIt will produce an AppleScript script that you can save as a droplet application. It‘s sort of like creating an Automator application for resizing images. So for example, if you regularly need to resize photos to a particular size, like 800 x 600, then you simply create the preset in ResizeIt, and then have the application create a droplet for that size. The code will open up in AppleScript and you can save it as an application that you can keep in your Dock. From there, you just drop your images onto the droplet and, viola, they get automatically resized. That‘s the way computers should work.

Online Tool To Resize Image

The key to resizing images is to have as many options to do so. No one wants to receive or view an oversized image. Let us know if you have any other strategies for resizing images. For Windows users, check out Simon‘s article on resizing photosThe Top 3 Apps to Batch Rename, Convert & Resize Photos (Windows only)The Top 3 Apps to Batch Rename, Convert & Resize Photos (Windows only)Read More.

Resize Image Pixels

In an article that’s soon to follow, we will give iPhoto it’s due when it comes to resizing photos. Stay tuned.

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Resize Image In Kb

1. Thank you for writing this article. I am trying to resize a pdf in Preview but when I go into Tools the 'Adjust Size' option is greyed out. Any ideas? Many thanks again, Kate

2. I have double clicked on my image and I can't find tools. All I can find is edit tools. I'm on a new Mac pro. It's a steep learning curve for an older PC user!

   • Toni SAME here my MAC is SO different from windows Maybe this thing is not for Mac users .:( I cannot even find the TOOLS button to try to re size

3. rite I want to put my photos in year files but it still seems to be in 2 different places i would just like file 2011, 2012, 2013.. and find the photos there not in different albums . it it possible? please surest anything x

4. Bakari Chavanu, I just wanted to say, Bless you for writing this article! I was having the hardest time trying to figure out which app. to use to resize or even locate some tool in the software that would assist in reducing the size of my photos and then came across your article. Very helpful.

5. Oh wow thank you so much for writing this article! I am building my website, and have used ImageWell in the past but it's not functioning and no support. Sooo I thought my only way to resize on my mac was in iphoto. So much easier in preview. I never looked at what was under those headings! Thanks again. You have saved me a lot of time.

6. Thanks for the tips. If you want to resize a single image to the exact pixels or proportion you specified, you can access ResizeImage.net, it supports JPG, PNG and animated GIF formats, you can even compress your images to smaller sizes without losing quality using the highly customizable options provided, and it's totally free!

   • No problem, Bakari.

     Perhaps most people do think that resizing an image is a deadly simple function, but actually many online image editors and resizers haven't offer the ability to crop and resize an image to the extract proportion or pixels, which is necessary to use an image as your avatars on sites like Facebook, Twitter, LinkedIn, VK, Pinterest, Tumblr and other social networking sites without distortion.

     The most popular image editing sites like Pixlr, fotor, befunky do offer this function, however they need you to have Flash player installed, and most of them do not support cropping and resizing the animated GIF format, do not support compress PNG images with transparent background, and do not support the progressive compression method for JPEG images.

     Resizeimage.net is simple and does not offer image editing functions, but it's designed for cropping, resizing and compressing images in one step, and we've fixed two errors and now it displays correctly in IE 8, but obviously it works best in the Chrome browser, and we found that the IE users( all versions ) do not like to use online generators and converters, over 90 percent of the users to our sites are using Chrome, Firefox and Safari.

7. To do it quickly and for free (comes standard with every mac), use sips.

   Open a terminal, go to the folder where your pictures are located and type:

   sips -Z 640 *.jpg

   All jpg files will be converted to 640 x whatever and aspect ratio maintained.

8. Nice article. I will check out your Automator article.

   A couple of small apps that I have found to do well at resizing images are ResizeMe (free) from Dare to be Creative / Incredible Bee (http://www.creativebe.com) & Downsize ($19.95) from Stunt Software (http://stuntsoftware.com/downs.. (ResizeMe was not listed at the Incredible Bee site, but is available at Apple (http://www.apple.com/downloads.. & other sites.) ResizeMe has a simple drag images onto a palette interface, does batch processing, adds drop shadows, watermarks, & reflections. Downsize also does batch processing & can add watermarks & frames. It also has built-in integration with iPhoto by way of a mini-browser. https://ninmgmt.netlify.app/xiaomi-mi-flash-tool-for-mac.html.

9. Nice article. I will check out your Automator article.

   A couple of small apps that I have found to do well at resizing images are ResizeMe (free) from Dare to be Creative / Incredible Bee (http://www.creativebe.com) & Downsize ($19.95) from Stunt Software (http://stuntsoftware.com/downs.. (ResizeMe was not listed at the Incredible Bee site, but is available at Apple (http://www.apple.com/downloads.. & other sites.) ResizeMe has a simple drag images onto a palette interface, does batch processing, adds drop shadows, watermarks, & reflections. Downsize also does batch processing & can add watermarks & frames. It also has built-in integration with iPhoto by way of a mini-browser.

10. Nice article. I will check out your Automator article.

    A couple of small apps that I have found to do well at resizing images are ResizeMe (free) from Dare to be Creative / Incredible Bee (www.creativebe.com) & Downsize ($19.95) from Stunt Software (http://stuntsoftware.com/downsize/). (ResizeMe was not listed at the Incredible Bee site, but is available at Apple (http://www.apple.com/downloads/macosx/imaging_3d/resizeme.html) & other sites.) ResizeMe has a simple drag images onto a palette interface, does batch processing, adds drop shadows, watermarks, & reflections. Downsize also does batch processing & can add watermarks & frames. It also has built-in integration with iPhoto by way of a mini-browser.

    • thanks for the input

11. Cool list. I prefer QuickScale from CodingMammoth (see Mac App Store), just 9.99 but good interface and powerful tool for single/batch scaling of images.

    • Pol, i'll check this one out. I'm always looking for better solutions.

      Free snipping tool for mac. Action Mac Windows / Linux Show Settings? Or Function+ F1? Hover over a UI element of DevTools to display its tooltip. Keyboard shortcuts for opening DevTools To open DevTools, press the following keyboard shortcuts while your cursor is focused on the browser viewport: Action Mac Windows / Linux Open whatever panel you used last Command+ Option+ I F12 or Control+ Shift+ I Open the Console panel Command+ Option+ J Control+ Shift+ J Open the Elements panel Command+ Option+ C Control+ Shift+ C Global keyboard shortcuts The following keyboard shortcuts are available in most, if not all, DevTools panels. If the element has a shortcut, the tooltip includes it.

12. Oh, thanks a lot for sharing this step-by-step ways on how to resize the photos in my Mac. Thank you very much. I am not that of a techie person so I will definitely use this tutorial.

    The Smart GIF Maker app is another great tool for creating GIFs on Mac The Simplest Way to Create GIFs on Mac for Free The Simplest Way to Create GIFs on Mac for Free Making GIFs may seem like an ordeal, but it doesn't have to be if you use this simple and quick workflow using free apps that are available on Mac. Best gif tool.

    • you're welcome Randy!

    • Cool, Randy. Glad you found it helpful.