The 6 Best FREE Online Image Compression & Optimizer Tools

Optimizing images & using a CDN has become essential for online publishing.

A few days back, I talked about the best image compression WordPress plugins where I highlighted some great solutions for compressing images on your blog.

But not everyone is using the WordPress platform for their website. Many of us are blogging on various other platforms like BlogSpot, Tumblr, or something else.

What’s the best image compression solution for these users?

Well, this is where online image compression tools come into the picture.

When you search online for photo compressor tools, you will be awestruck by the sheer number of tools available. To make your work easier and save you some time, I’m listing some of my favorite tools that you can use right now to compress images & make them web-ready.

  • (Note: A few of the listed tools also support compressing .pdf files which is useful for those who are selling eBooks online.)

Question: Why do you need to compress images?

The main reason is to lower down the loading time of your blog as this has a direct correlation with search engine ranking.

If your page takes more time to load, your competitor can outrank you based on similar quality content, but a faster loading time.

It’s important to note that having images on our blog posts are very useful as they improve the visual experience & make our content more media rich.

At the same time, to stop images from slowing down the loading time of our pages, we can use a few techniques:

  • Compress images without losing quality.***
  • Use high-quality hosting for your website.
  • Use a Content Delivery Network.

When in doubt, you can use any of these page loading time testing tools to see how fast or slow your website is loading.

***In this article, we will talk about compressing images.

  • Note: If you are using WordPress for running your blog or website, you should use one of these image compression plugins instead.

6 Best Online Tools for Compressing Images (without losing quality):


I love this one as the UI is very modern. It makes compressing images fun!

You can export compressed images using Dropbox or Google Drive. It supports the compression of 4 image formats:

You will want to bookmark this for future use.


This is one of my favorites as you can compress multiple files in one go.

Simply drag & drop.

What’s really cool here is that you can download all of the compressed files into a .zip file with single click.

I have been using it for a while & highly recommend it.

Below you can see the amount of data saved by the image compressor:

Images Compressed with Kraken (This image was also compressed with Kraken)

3. GiftOfSpeed .PNG Compressor || jpg compressor

When I was researching online image compression tools, I landed on the GiftofSpeed website.

This is one place which offers many tools that any webmaster can use to test various dimensions of their website.

This is another easy to use online image compressor site.

You should also use their image delivery tool to see if images on your blog posts or websites are well-optimized. It will also suggest things that you can do to further optimize your site.

Here is the result from one of my recent blog posts:

In my case, I always compress my images using ImageOptim (Free for Mac). At times, I run a batch image compression in WordPress using a plugin.

You should go to GiftofSpeed and take a test for your site to see how much KiB you can save by compressing images. This will give you a good idea of which image compressor tool/WordPress plugin you should be using.

4. Tinypng

This is one of the oldest & most well-known websites for compressing images online.

Tinypng also offers a WordPress plugin & a Magento extension that you can use to compress images without the hassle of manually uploading & compressing images on their website.


The free account lets you compress roughly 100 images/month.

To use this plugin you need to get an API key from here.

5. OptimiZilla

I really like this one as you can compress an image based on your desired level of quality.

The instant preview lets you compare your original image to your compressed image & you can set your desired compression level from this preview.

This is useful when you are compressing a huge image & want a way to control quality loss.

It uses the best optimization and lossy compression algorithms to shrink JPEG and PNG images to the minimum possible size while keeping the required level of quality.

  • It supports bulk upload & bulk compression.
  • You can upload up to 20 images.

(You should also know about OptimiZilla’s sister converting site called Toepub. This lets you convert .pdf files into various formats for free. eBook authors will find Toepub very useful.)

6. ImageRecycle

This is another great image & .pdf compression tool.

You can use its online compressor tool for free and developers can use its API to build their own compression tool.

It supports multiple CMSs using their API. Right now, they have a WordPress plugin, Shopify app, Joomla Extension, and a Magento extension.

You can create a 14-day free trial with a 100 MB quota.

They also have an interesting offer for bloggers who can write about their service in order to get 2 months of access with a 3GB quota. I believe 3GB is good enough for many of you to compress all of the images in your media library.

Over to you:

These are some of my favorite online web apps to compress images without losing quality.

I seldom use them for projects which are not related to WordPress or blogging, but you can use them however you like.

Now, it’s your turn to contribute. Let us know your favorite image optimization tools in the comments section below.

If you’ve enjoyed learning about these tools, show your love by sharing this post on Facebook & Twitter.

Here are some hand-picked articles to help you get more out of your images: