- Image CDNs at a glance
- Eleven image CDNs to compare
- Which image CDN suits your site
- Which image formats search engines accept
- Plugin, platform or self-hosted
- Questions to ask before you choose an image CDN
- Signs your site needs an image CDN
- My plain advice on choosing an image CDN
- Frequently asked questions
The best image CDNs resize, compress and deliver your images from servers close to each visitor, so pages load faster on every device. Some plug straight into WordPress, some are full media platforms with video and asset management, and one runs on your own server. Eleven options follow in no particular order.
Images are often the heaviest part of a web page, and that's rarely obvious until you look. Upload a photo straight from a phone and you might be sending a file many times larger than the space it fills on screen, which slows the page down for every visitor. It's worst on mobile data, where people won't wait.
The eleven image CDNs below are listed alphabetically and in no particular order, and every description comes from the provider's own website, read this week. If you write blog posts, my tips for using images in blog posts cover the content side.
Image CDNs at a glance
I checked the free plan column on each tool's own website, as of Oct 2026. Yes means the site names a free plan, a free version, a free allowance or an open source version. Trial only means a time-limited trial. Not stated means the pages I read named neither, even where there's a button inviting you to start for free, so check the vendor's page before you sign up.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| Bunny Optimizer | Dynamic image resizer on a CDN | Faster images without writing code | Trial only |
| Cloudflare Images | Image optimisation and delivery platform | Sites already using Cloudflare | Not stated |
| Cloudinary | Image and video management platform | Large media libraries with video too | Not stated |
| Fastly Image Optimizer | CDN image optimiser | High-traffic sites on an enterprise CDN | Not stated |
| ImageKit | Image and video API with a DAM | Media APIs plus asset management | Not stated |
| imgix | Image processing and delivery | Transforming images through URL settings | Trial only |
| imgproxy | Self-hosted image processing server | Running image processing on your own server | Yes |
| Optimole | Image CDN for WordPress | Sites wanting one-click plugin setup | Yes |
| Sirv | Image CDN, processing and hosting | Responsive images and 360 product spins | Not stated |
| TwicPics | Responsive images CDN from Frontify | Lighter, more sustainable pages | Not stated |
| Uploadcare | File upload, processing and delivery | Accepting uploads from your users | Not stated |
Eleven image CDNs to compare
Bunny Optimizer
Best for: Small businesses who want images resized and optimised by a CDN without writing a single line of code.
Cloudflare Images
Best for: Teams already using Cloudflare who want to store, optimise and deliver images through the same network.
Cloudinary
Best for: Brands with large image and video libraries that want upload, storage, optimisation and delivery handled in one platform.
Fastly Image Optimizer
Best for: High-traffic publishers and retailers who want image optimisation running at the edge of an enterprise CDN.
ImageKit
Best for: Ecommerce and media teams who want image and video APIs alongside digital asset management and creative automation.
imgix
Best for: Developers at image-heavy brands who want to transform, optimise and deliver visuals at very large scale.
imgproxy
Best for: Engineering teams who'd rather run image processing on their own servers than send every image through a third-party service.
Optimole
Best for: WordPress site owners who want real-time image optimisation and a global CDN connected through a one-click integration.
Sirv
Best for: Online shops that want responsive images served at the right size for every device, edited through simple URL changes.
TwicPics
Best for: Brands that want responsive images delivered as a service, with an eye on lighter, more sustainable websites.
Uploadcare
Best for: Apps that let users upload files and want an uploader, image CDN and video CDN from one provider.
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Which image CDN suits your site
- WordPress sites wanting one-click setup: Optimole.
- Faster images without writing code: Bunny Optimizer.
- Sites already on Cloudflare: Cloudflare Images.
- Large libraries with video as well: Cloudinary or ImageKit.
- High-traffic sites on an enterprise CDN: Fastly Image Optimizer or imgix.
- Online shops with responsive product images: Sirv or TwicPics.
- Accepting uploads from users: Uploadcare.
- Running image processing on your own server: imgproxy.
Which image formats search engines accept
Google Search Central says Google Search supports images in BMP, GIF, JPEG, PNG, WebP, SVG and AVIF formats, and recommends that the filename extension matches the file type. It also covers inlining small images as Data URIs.
That's useful reassurance, because many image CDNs can serve modern formats such as WebP and AVIF automatically to browsers that support them. You'll get smaller files without losing your images from search results.
Plugin, platform or self-hosted
A plugin-style image CDN connects to your site and starts optimising images within minutes. It suits small business websites and WordPress owners who'd like faster pages without touching code.
A full media platform adds storage, transformations by URL, video and asset management, and suits shops and publishers with big libraries. A self-hosted server gives you full control, but your team runs and maintains it.
Questions to ask before you choose an image CDN
- Does it work with my website platform?
- Will it serve WebP and AVIF automatically?
- Can it resize images for each device?
- Do I need video delivery as well?
- How do I keep my original files safe?
- What happens if I switch provider later?
Signs your site needs an image CDN
- Pages crawl on mobile data. Serve smaller images.
- Product photos look soft when zoomed. Deliver higher resolution on demand.
- You resize images by hand for every page. Automate it by URL.
- Your hosting struggles with traffic spikes. Move images to a CDN.
Do you make an image CDN or media optimisation tool? Tool makers can ask to be considered for a featured place on this list.
My plain advice on choosing an image CDN
Measure your page speed before and after, using the same pages, so you know the change made a difference. If most of your weight is a handful of huge hero images, resizing those by hand might get you most of the way before you add a service.
Keep your original images somewhere safe outside the CDN, so you're never locked in. And don't forget alt text while you're tidying images, as my guide to common alt text mistakes explains.
Frequently asked questions
What is an image CDN?
An image CDN resizes, compresses and delivers images from servers around the world, so each visitor gets a smaller file from a nearby location.
Are there free image CDNs?
Some offer free plans or open source versions, and others offer trials. The free plan column above shows what each provider's site says.
Does an image CDN help SEO?
Faster pages help visitors, and Google Search supports modern formats such as WebP and AVIF that image CDNs often serve.
Do I need an image CDN for WordPress?
Not always, but a plugin-style image CDN can speed up image-heavy WordPress sites without code changes.
What's the difference between an image CDN and a normal CDN?
A normal CDN delivers files as they are. An image CDN also resizes, compresses and converts images on the fly.
Will an image CDN change my original images?
Usually not. Many keep your originals and create optimised versions as visitors request them.
