July 19, 2021

How to Convert Images to WebP with Imagify

Interested in converting your images to WebP on WordPress? Say hello to Imagify, our free plugin that optimizes your images and converts them to WebP.

In our guide, we explain how to deliver high-quality images without slowing down your site. If you already have hundreds of PNG or JPG images on your website, Imagify will optimize them and convert them to WebP automatically. 

Sounds promising? Let’s dig into this modern WebP format to see how it impacts performance by shrinking image file sizes up to 35%! 

What is WebP format?

WebP is an image format that offers image compression by reducing the file size but not compromising the quality. Developed by Google, WebP is a modern image file format containing lossless and lossy compression. The format can reduce image file size up to 35% smaller than JPEG and PNG images while retaining high quality. Best of both worlds, right? 

Visitors want quality AND a fast website. That’s why there’ve been new formats coming out in recent years designed with minimizing files in mind while still retaining quality. “WebP”  is definitively the most notable update in the past 10 years. 

In the example below – provided by the Google WebP website – we compare two images with the same quality. One is JPEG, the other one is WebP, and we notice three things, namely: 

  • The quality of the image remains the same in JPEG or WEBP
  • The JPEG file size is 43.84 KB.
  • The WebP file is 29.61 KB, which is much lighter than the JPEG format.
JPEG vs WebP: same quality but different size - Source: WebP Gallery

WebP format helps you achieve the following balance:  High-quality images and Low file size.

Why You Should Convert Images to WebP

The main benefit of the WebP format is to create smaller image files while preserving the same image quality. Consequently, image compressions will result in speeding up your website.

You may not realize this, but pictures take up so much space on your server. Not only does it eat up storage like crazy, but it can also slow down websites too and make your visitors run away. 

JPEG, PNG, and GIF are the formats that can be easily converted to WebP:

  • JPEG: the most common format, ideal for photos and visuals very rich in color
  • PNG: the recommended format for simple graphics, icons, and logos
  • GIF: for all the animated images that punctuate your messages

Google ran a WebP compression study to see how webP compares with JPEG and PNG formats in terms of file size. The results are interesting: 

  • A WebP image is 25% smaller than a PNG image.
  • A WebP image is 25-35% smaller than a JPEG image.

These results indicate that WebP can provide significant compression improvements over JPEG and PNG. In the graph below, we see that a WebP image consistently required fewer bits per pixel than JPEG: 


Furthermore, Google PageSpeed Insights recommends you to serve Images in next-gen formats (WebP), which means faster downloads and less data consumption. The web performance tool also suggests using a WordPress plugin to compress and convert your images to the optimal formats.

Guess who’s on the list? Imagify!

How to Convert Images to WebP 

Imagify is one of the best WordPress plugins to convert your images to WebP and to optimize them. 

Imagify plugin

We all know online tools that can convert many formats (from JPG to PDF, for example). Those tools are not user-friendly, and most of them won’t allow you to do bulk conversions for free. 

A plugin may be easier to convert your files to WebP. Let’s see why. Things get a bit more complicated when it comes to WordPress. WordPress 5.8 allows you to upload WebP images but it doesn’t convert the original format to WebP.

That’s why we recommend you upload PNG and JPEG images and let Imagify do the job. The Imagify plugin can automatically convert your images to WebP format in your WordPress dashboard. It will optimize any JPG, GIF, or PNG files on your website by shrinking them for a faster browsing experience without sacrificing quality. If you have images already added to your published pages, don’t worry, Imagify will also convert them.

Imagify automatically optimizes and converts WordPress images to WebP:

  • While uploading new images
  • On your existing ones (bulk feature, which will save you some precious time)

What’s more, Imagify helps you make photos load faster on WordPress. The plugin compresses multiple images in their original formats and resizes images to a set of max dimensions without losing quality. It’s not only a converter tool. It’s also a plugin that helps your WordPress site run faster!

Follow our step-by-step guide to see how to convert images to WebP using Imagify:

Step 1 – Download Imagify for free

Activate the plugin and create a free API KEY. 

(Go to your email inbox to get your API key and paste it in the box below).

Step 2 – Setting up the WebP conversion option 

Once you’ve added your Imagify API key, go to Settings → Imagify and scroll to the “Optimization Webp format” section. Make sure that both boxes are checked as below:

Webp format conversion - Imagify dashboard

The first box tells Imagify to convert your images to WebP; the second indicates the plugin to serve those WebP images to supported browsers.

Step 3 – Time to convert your images

Go to Media -> Bulk Optimization and press the blue  Imagify’em all button: 

Imagify’em all button

That’s it! You can get a faster website in only three steps with Imagify

Pricing of Imagify (and yes, a free plan is available!)

Starter plan: Imagify allows you to optimize and convert 20 MB of images per month for free (around 200 images). 

Growth plan: If you need more than that, you can upgrade to a paid plan, which costs $4.99/month for 500 MB (~5,000 images).

Infinite plan:  $9.99 per month for unlimited data. That’s great if you have a website with thousands of images to optimize. 

The pricing can be found on Imagify’s official website.

The Impact of WebP on Performance with Imagify

Let’s now see how to use Imagify to reduce the size of media files.

For the analysis, we will run two scenarios using our WordPress dashboard:

  1. I’ll upload a GIF, a PNG, a JPG and check the file size for each of them. 
  2. I’ll activate Imagify, convert my 3 files from above to WebP and verify the new file size. 

Let’s run the analysis. 

  • Impact of Imagify on my GIF file size: 
GIF file size – No ImagifyWebP Format – With Imagify 
816 KB512 KB
  • Impact of Imagify on my PNG  file size: 
PNG file size – No ImagifyWebP Format – With Imagify
67 KB28 KB
  • Impact of Imagify on my JPG  file size: 
JPG file size – No ImagifyWebP Format – With Imagify
755 KB525 KB

Did Imagify reduce my file size when converting them to WebP? 

✅ The answer is yes! As you saw, all file sizes have significantly decreased after using Imagify and the WebP format. Here’s a recap:

  • GIF → WebP: size went from 816 KB to 512 KB
  • PNG → WebP: size went from 67 KB to 28 KB
  • JPEG → WebP: size went from 755 KB to 525 KB.

Using Imagify to Improve My Performance Grade on Google PageSpeed Insights

For this performance audit, I’ve built a page displaying some media: a JPG photo, a PNG element, and a GIF.

We will use Google PageSpeed Insights and run the two following scenarios: 

  1. Scenario #1 – A performance audit of my page (PNG and JPG formats images + GIF) – no Imagify – no WebP
  2. Scenario #2 – Performance grade of my page after converting all my media to WebP with Imagify 

Scenario #1: No Imagify – No WebP

I’m in the orange on Google PageSpeed Insights  (88/100), and not all my Core Web Vitals are in the green: 

Audit without Imagify - Source: PSI

In the opportunities section, we can see several issues related to the format of my images, such as “Use video formats for animated content” or “Serve Images in next-gen formats”.

Opportunities section - PSI

If I had 50 pages with 200 products, I would be very worried about converting them manually… But luckily, Imagify can do that for me! 

Scenario #2: WebP Format with Imagify

Let’s now take a look at the results after converting all the media to WebP using Imagify.

My performance grade improved: I’m in the green, with a 99/100 score! 

My green score thanks to Imagify - Source: PSI

In the opportunities section, all my images-related issues are gone: 

Images related issues are solved thanks to Imagify - Source: PSI

Wrapping Up

WebP is definitively an efficient way to reduce the image sizes and make your WordPress site load faster. This modern format saves on average ~25% more storage than JPEG or PNG files. Another good news is that the user experience will not be affected, seeing as the quality of the images remains the same. 

Also, don’t worry if you have at least 200 of one type of image file (png or .jpg) in different sizes because our powerful Imagify Plugin will replace them with the optimized WebP format without sacrificing quality. 

WordPress 5.8 will add support for WebP images (but won’t convert them from the original format to WebP). That’s why we still recommend you use a plugin to convert your files. Here’s why: 

  • The ability to upload WebP images directly to the Media Library won’t fix the ~5% of visitors whose browsers don’t support WebP.
  • Images and pictures are usually in JPG or PNG, so to upload them and convert them in bulk, a plugin like Imagify can save you hundreds of hours. 

What about taking Imagify for a test drive? It’s free for around 200 images a month. 

And remember, if you have any questions about using WebP on your WordPress site, please ask us in the comments below!

Imagify, decrease the size of your images, increase the speed of your website: try it for free
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