How to optimize images with the image compression web app?

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What is image optimization?

Image optimization improves the customer experience, especially on websites that use a lot of images and services where images are frequently uploaded.

So what is image optimization in the first place and why does it do so much?

You can display not only text but also images on a website. Just as the text has a font size, so does an image. And the size of the image is “image size (display size)”, which indicates the size of the appearance, and “file size”, which refers to the amount and size of data.

The larger these sizes, the longer they will take to load. It takes a long time to load = the user’s waiting time, which leads to leaving the site with “It’s a slow loading site, it’s already good”.

To improve the appearance and display speed of the site, optimizing the “image size (display size)” and “image file size” described above is called “image optimization”.

Why is image optimization important?

In the first place, a website can be displayed without optimization. However, it is preferable to optimize for the following reasons: Let’s explain why.

Increase display speed and prevent website visitors from leaving.

If you have a lot of images with large file sizes, it will take a long time to load and the page will display slowly. According to one theory, 40% of users will drop off when the page display speed is 5 seconds. Even if you have an attractive website, users will leave just because of the slow display.

Images are a very large percentage of data in a website, and simply reducing the amount of data in the images can greatly improve the display speed of the page. For sites that use a lot of images, optimization is a must!

Display images tailored to the user’s device to improve UX.

By adjusting the display size of the image, you can make the website easy for users to see. Too wide and too small, both are difficult to see. The display size that was suitable for each website is important.

In addition, it is important to design the image in consideration of the feelings of the viewer, such as the display size for PC users and the display size for smartphone users.

What is the best “image size” for a blog?

Next, I will explain the optimal “image size” for blogs.

In conclusion, there are two points.

Optimal image size

  1. 200KB or less
  2. The width should be about 1,000px.

We will explain each of them in detail!

The file size of one image should be as light as possible, with 200KB as a guide.

According to the data released by Google, you should aim for a page capacity of “1.6MB or less” in consideration of slow mobile lines.

Considering site configuration data other than articles, 5~6 images of 200KB are enough.

A lighter one would be preferable, but I think it is possible to use images for each point.

On the other hand, most free image materials are around 500KB to 10MB (10,000KB), so they are more than twice the recommended size as they are.

Image Compressor Tools

If you want to change the image size, you need a tool. While there are tools for professionals, such as Adobe Photoshop, Photoshop has a lot of tools for advanced designers, and it may be over-spec if you just want to cut, resize, and export images for the web. Instead, try our easy-to-use image compressor.

JPEG Compressor:

An easy-to-use compression tool is, which is familiar with panda images. I think many people use it. You can drag and drop images of 20 files at the same time, and Both JPEG and PNG are supported, so it’s easy to use with just one of them!

If you have a lot of images that you want to compress at once, is the tool we recommend. You can optimize multiple images at once and download them in zip format or process them one by one.


With JPEGmini, you can quickly reduce the size of your JPEG files. There is a quality slider and a preview function so you can see in advance what the image to be compressed will look like.


PNGGauntlet uses OptiPNG, and PNGOUT, and develops technologies to minimize PNG files without losing quality.

 Bulk Image Compressor

If you’re an Android user on your phone, there’s no better app than Bulk Image Compressor in terms of ease of use. Bulk Image Compressor can compress a large number of images at once.

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