For stable website performance and fast page loading, it is extremely important to compress images. This is because large photos overload the server and increase content loading time. In today’s reality, when every millisecond of user attention counts, this is simply unacceptable.
Why large images harm your website: impact on SEO and speed
Even high-quality SEO optimization of a website will not be effective enough if you do not compress photos. As research shows, a loading delay of just 1 second can lead to a 7% decrease in conversions. In addition, it negatively affects Google rankings. If the website loading speed decreases, the resource loses positions in search engine results.
Core Web Vitals and page loading
Core Web Vitals is a set of metrics from Google that evaluate the real user experience when interacting with a page. Large photos negatively affect several of them at once:
- LCP (Largest Contentful Paint) – the loading time of the main element of the page;
- CLS (Cumulative Layout Shift) – layout stability during loading;
- INP (Interaction to Next Paint) – the speed of response to user actions.
Under such conditions, successful website promotion becomes almost impossible, which is why it is necessary to compress photos.
How to check if your website has large images
Google PageSpeed Insights is the simplest way to check. Using the service is quite easy. You just need to enter the page URL and wait for the analysis. The report will also include a list of images that are recommended to be converted to other formats.
You can also perform the check using Chrome DevTools:
- Press F12.
- Go to the Network tab.
- Select the Img filter.
- Refresh the page using Ctrl + R.
- Look at the Size column.
This way, you will easily detect photos with high resolution.
Which format to choose: JPEG, PNG, or WebP
For websites, one of the following formats is usually chosen:
- JPEG. A universal format compatible with all browsers. It has a smaller file size compared to PNG, but JPEG optimization often leads to quality degradation.
- PNG. Fully compatible with browsers, but can slow down website loading speed due to relatively large file sizes.
- WebP format. Allows you to compress images with minimal quality loss, but is currently not supported by all browsers.
The choice of format depends on specific needs. For example, PNG compression is appropriate for highly detailed graphics, while JPEG is suitable for cases where file size is the top priority. Converting images to WebP is appropriate when a universal solution is needed.
Comparative table of image formats
| Characteristic | JPEG | PNG | WebP | AVIF |
| Purpose | Photos, complex images | Graphics, logos, screenshots | Universal format | Maximum compression |
| Compression type | Lossy | Lossless | Both | Both |
| File size | Medium | Large | Small | Smallest |
How to compress a photo to the desired size: step-by-step guide
You can compress a photo to 2 MB, 500 KB, and even less. Image optimization looks like this:
- Determining the required size.
- Reducing the physical dimensions of the image (width and height).
- Choosing the format (for example, converting the image to WebP).
- Compression without noticeable quality loss.
- Checking the final version of the file before uploading.
It is better to optimize images for a website using a comprehensive set of measures. The alt text of images, which search algorithms can see, is extremely important. Accordingly, SEO optimization involves using relevant file names. For example, IMG_001.jpg can be replaced with black_car.jpg.
Compress a photo to 1 MB online: top tools
You can compress a photo to 1 MB using the following tools:
- Squoosh. A program by the Google team that allows you to change formats and see the final file size before downloading.
- TinyPNG / TinyJPG. This tool is convenient for reducing photo size online when you need to quickly process a large number of files.
- Compressor.io. Helps compress images without quality loss and sharpness degradation. It offers various compression options.
- ImageOptim. The program removes everything unnecessary: EXIF metadata, color profiles, and more. It does not just compress but makes the file “clean.”
With these tools, you can easily reduce photo size online.
Compress a photo to 500 KB: when and how
Compressing a photo to 500 KB is usually necessary when placing full-screen sliders, creating high-quality product renders, and banners on the homepage. In this case, you can use lossy compression while keeping the quality level at approximately 75–85%. Then the file size will decrease significantly, and the difference will be almost imperceptible to the human eye.
Compress images without quality loss: tips and balance
It is unlikely that you will be able to compress image size completely without quality loss. But the following recommendations will help make these changes virtually unnoticeable:
- do not compress photos multiple times in a row;
- optimize the size before uploading;
- remove metadata.
If the page loads quickly and the photo remains sharp and detailed, then the balance between file size and image quality is correct.
Automatic image optimization on websites
Special plugins have been created for WordPress that allow you to compress image size and optimize the process. These include Smush, Imagify, and ShortPixel. When using them, you do not need to compress each image separately and can quickly optimize images for your website.
Mistakes when compressing images: what to avoid
Among common mistakes, the following can be highlighted:
- compressing what is already compressed;
- lack of backups;
- replacing SVG with raster.
Of course, you can compress a photo to 2 MB, but it is better to make the image size much smaller. 2 MB is acceptable only if it is the sole image on the entire page.
FAQ
1. What is the optimal compression for a website?
In most cases, the WebP / AVIF format with a quality level of 75–85% is suitable.
2. Does quality deteriorate during compression?
Quality may deteriorate, but thanks to modern algorithms, these changes are almost imperceptible.
3. What is the maximum photo size for a page?
You should try to ensure that the total size of all images on the page does not exceed 2 MB. If there are only 2 images on the page, you can compress the photo to 1 MB, but it is still better to make the size smaller.
Image compression – an important optimization tool
Photo optimization is extremely important not only for fast website performance but also for improving positions in search engine results. However, compressing images with high quality can be challenging. It is better to entrust the task to professionals and contact the LuxSite agency. Our experts will conduct a full technical audit of your website, optimize graphics, and configure Core Web Vitals for your business.
