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How To Bulk Optimize Images for Faster Web Pages

There are several reasons you will need to optimize your images for web. Most digital cameras take very large high quality photos. And when left untouched and raw, they contain a lot of heavy information that is not needed to be served on a website.

If you don’t optimize, your images will weigh down on the web page that you are trying to serve to your visitors. The browser and/or server will take too long to respond because there is too much information to read and download. This causes lag and if your page takes way too much time to view on their cell phone, tablet or desktop, your visitors won’t want to wait around for your page to load. They will find the information elsewhere or give up all together. A faster site is a more search engine friendly website (SEO friendly).

There are 2 main types of compression levels available, Lossy and Lossless. Basically, choose lossy if you prefer a more optimized image weight (faster image). The program will do it’s best to retain maximum quality in doing so. Lossless is a little bit more fancy, so if you rely on high quality images ( photography websites ) to be served, and still require optimized images, this is a better choice for you. The majority of users should go with Lossy.

How To Bulk Optimize Images With A Mac

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  1. On your mac, locate the images you want to resize. If you want to keep the raw files, I would suggest making a copy of the images you want to resize so you don’t effect the original images in case you need the larger files for later use.
  2. Select all images.
  3. Right click on the selected images and choose “open with preview”
  4. In preview go to “edit” > “select all”
  5. Then go to Tools > Adjust Size
  6. For web, you’ll want a resolution of 72. Make sure “scale proportionatly” is checked.
  7. Now just choose one or the other, for my clients, I say concentrate on width rather than height. So for width my reccomendations to keep a website optimal and speedy and still have large pics would be a minimum of 500pixels wide OR a maximum of 1200 pixel wide or an average of 800 pixels wide. If your website depends on showing off beautiful images because you are a photographer, or food blogger. You should stick with larger.
  8. Click Okay
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Image Compression Apps for Mac

Download Compress premium version (4.99) at the app store. If you don’t know how to download and install apps on your mac, you can learn to do that by reading this article.


Than click the add images button and search thru and select all images you want used in this compression. You can keep coming back and adding images until you have the amount of images you want to optimize for this session. Once you’re done, click the compress number. There should be a number next to it indicating how many photos you’ve chosen for this compression. Once complete, the system will ask you to save (or perhaps open) this new compressed folder somewhere on your computer. Find a spot to save and do so. It will drop an entirely new folder filled with a super optimized copy of all your photos you chose.  Close out of the app when done.

Compress images with mac app

Another alternative is ImageOptin, which is free, but doesn’t optimize as well as compress app from mac store.

How to Bulk Optimize Images with a Windows Computer

Unfortunately, there are not a whole lot of options in windows computer programs that allow you to do batch optimization of images. But here are a few…

How to optimize images using an Android

How to reduce image file size with an Iphone

How to Bulk Optimize Images Online

With TinyPNG you can upload and download your images for optimization. The catch here is that you can only upload 20 images at a time and none of them can exceed 5MB each.

Bulk optimize images online

Other online bulk image optimizers include…

How to Bulk Optimize Images with WordPress Plugins

This is not the most ideal way to optimize large images. preferably, they are already optimized before you upload. Reason being, is that when you make you website do fancy jobs like this, there is a risk involved with doing so, like crashing your website. So be careful. Call a professional 😉

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But there are tools out there that you can use if you want WordPress to do some work for you, before and/or after images are uploaded. Here are a few of my favorites!

Author: Heather Valencia

Author: Heather Valencia

Web Designer & Developer

I’ve been developing WordPress websites as a freelance web designer in Spokane since 2010. My passion for building websites is as strong as the dedication I put forth in strengthening my client relationships.

If you’ve valued the content I work hard to provide for free, show your appreciation with a cup of coffee or a tip.

Either way, I’m very appreciative that you came here. Share a post and if you think something is lame, email me and let me know.

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  1. Ram Ya

    Hi Heather,

    Thanks for the article. Image compression is a factor in both rankings and user experience. I wanted to share a free online tool which can save up to 70 to 90% image size. It support batch compresses up to 20 images.


  2. Dan

    Another cool (free) online tool is You just upload a pile of images, and it’ll convert most common file types into sRGB .JPG files that are optimized for the web to your specs, and then provides you with a .ZIP file to download your new images.

    It’s very easy to use, there’s even a video tutorial if needed.

    Also, you can get past the 100MB upload limit by uploading multiple batches of (for example) 95MB in images. The point is, you can still download a single .ZIP file, even when doing multiple batch uploads. – Thank you

  3. Michael Kugler

    One of the programs you didn’t mention was Adobe Photoshop. We use it all of the time when on our website

    All of our clients can upload up to 35 high res images and as you can imagine this can really tax a server. A typical uncompressed folder will have anywhere from 90 to 235MB. By the time we optimize with Photoshop we can have the same folder down to 8-20MB and the quality is impressive.

    Typical time to run a batch of 200 images is about 3 minutes, just set the image processor and forget about it.

  4. Seonghun Jin

    Webp images are great but they always make problem in iOS platforms.
    I end up using JPEG. LOL

    • Heather Valencia

      Ah, thats good to know. Thank you!

  5. John Jaccob

    For better results optimize your images with GOWebP WordPress Plugin its better than any plugin,


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