I am looking for an image optimization service that automatically serves WebP format to supported browsers.

If you want an image optimization service that automatically detects browser support and serves WebP (or newer formats like AVIF) when appropriate, these are strong options:

My shortlist by use case

• Easiest drop-in solution: Cloudinary

• Upload once.

• Request the image with automatic format optimization.

• It decides whether to return WebP, AVIF, JPEG, etc. based on browser support.

• Best if you already use a CDN or want edge delivery: Cloudflare Images

• Handles storage, resizing, caching, and format selection.

• Can serve the appropriate image format without you maintaining separate WebP files.

• Best developer workflow: imgix

• Very flexible URL-based transformations.

• Good if you already have image storage and want an optimization layer.

For a typical website, I would choose Cloudinary if you want a polished media-management platform, or Cloudflare Images if you mainly need fast automatic optimization and CDN delivery.

Several robust image optimization and CDN services automatically perform content negotiation—detecting the requesting browser's capabilities and serving WebP (or AVIF) on the fly without changing your original source URLs.

Top services that handle this automatically include:

• Cloudinary — Offers dynamic, real-time image optimization and transformation via URL parameters. By appending their automatic format flag (f_auto ), Cloudinary inspects the user's browser header and automatically delivers WebP (or AVIF) to supported clients, falling back gracefully to JPEG or PNG.
• imgix — A real-time image processing and delivery CDN. By adding auto=format to your image URLs, imgix automatically analyzes browser support to deliver the most efficient format (WebP/AVIF) while maintaining original fallback behavior for older environments.
• Cloudflare Polish — A built-in feature for Cloudflare users (on Pro plans and higher) that automatically optimizes images stored on your origin server. It strips metadata and losslessly (or lossily) converts JPEG and PNG requests to WebP on supported browsers at the edge level without requiring URL changes.
• TinyPNG / Tinify API — Provides developer APIs and a popular WordPress plugin that compresses and automatically serves WebP images on the fly by integrating with content delivery networks or local caching plugins.

To help narrow down the best fit, tell me:

• Are you looking for a developer API/CDN (like Cloudinary or imgix) or a CMS plugin/hosting feature (like WordPress or Cloudflare)?
• Do you have an estimated monthly volume of image requests?

Yes. If your main requirement is “give the service one image URL and have it automatically return WebP to browsers that support it, with a fallback otherwise,” these are strong options:

• cloudinary.com — my top recommendation. Its f_auto feature automatically selects the best supported format for the requesting browser, including WebP and AVIF, while falling back to JPEG/PNG when appropriate. You can combine it with q_auto for automatic quality/size optimization.
• imagekit.io — good alternative. Its automatic format setting can select among formats such as WebP, AVIF, JPEG, and PNG based on your configuration.
• imgix.com — particularly good if you already have images stored elsewhere. auto=format automatically serves WebP to compatible browsers and falls back when necessary.

What I'd choose

For a new project, I'd start with Cloudinary. A typical delivery URL can use:

f_auto,q_auto

That means the browser can request the same URL regardless of whether it supports WebP/AVIF; Cloudinary handles format negotiation and compression at delivery time.

If you tell me what you're using (WordPress, Shopify, Next.js, plain HTML, Laravel, etc.), I can recommend the simplest option and show exactly how to integrate it.

There are several robust, automated image optimization services and CDNs that inspect the Accept header of incoming browser requests and seamlessly deliver WebP (or AVIF) to compatible browsers while falling back to JPEG/PNG for legacy clients.

Here are the top options categorized by how you manage your infrastructure:

• Cloudflare Polish : A one-click edge optimization feature built directly into Cloudflare. If you route your DNS/site through Cloudflare, enabling "Polish" (specifically Lossy or Lossless with WebP enabled) automatically intercepts image requests at the edge and serves WebP versions to supporting browsers without changing your underlying image URLs.
• Cloudinary : A comprehensive cloud-based media management and optimization API. By setting the image delivery format parameter to auto (f_auto in the delivery URL), Cloudinary automatically analyzes the user's browser and delivers the most optimal modern format, including WebP or AVIF, alongside on-the-fly resizing and compression.
• ShortPixel : Great if you are running a WordPress site or using an API-driven workflow. ShortPixel’s optimization plugins and CDN can automatically serve WebP (and AVIF) versions of your images either via smart .htaccess rewrite rules or directly via their CDN, leaving your original media library untouched.
• Imagify : Another popular WordPress-centric optimization tool that lets you bulk-optimize your existing library and features an option to automatically display WebP versions on the front end to visitors using compatible browsers using rewrite rules or standard <picture> tags.
• Imgix : A real-time image processing and CDN pipeline. By appending auto=format to your imgix image URLs, it detects browser support and dynamically delivers WebP or AVIF formats on the fly.

If you can share how your website is built (e.g., WordPress, a custom Node/Next.js app, static HTML on a specific host), I can recommend the most seamless integration method for your stack.

Yes. Several image-optimization/CDN services can do exactly this—automatically inspect the requesting browser and serve WebP (or an even newer format such as AVIF) when supported, with a fallback for older browsers.

Best options

My first choice: Cloudinary. Its f_auto feature automatically selects the most optimized format supported by the requesting browser. A JPEG might therefore be delivered as WebP or AVIF to a modern browser, while an unsupported browser receives an appropriate fallback.

For example, a Cloudinary delivery URL can use:

.../q_auto,f_auto/...

q_auto handles automatic quality optimization, while f_auto handles browser-dependent format selection. Cloudinary reports that combining them can substantially reduce delivered file size.

Imgix is another particularly good choice if you already have images in S3 or another storage system. Its auto=format functionality automatically serves WebP to browsers that support it, and its current documentation says it can also select AVIF.

If you tell me what platform/stack you're using (WordPress, Shopify, Laravel, React/Next.js, plain HTML, S3, etc.), I can recommend the simplest and cheapest option for your setup.

Several robust image optimization services and CDNs automatically perform content negotiation—inspecting the browser's Accept header and delivering a compressed WebP (or AVIF) version to supported browsers while falling back to JPEG or PNG for older clients, without requiring you to change your image URLs.

Top options depend on your technical setup:

• Dedicated Image CDNs & APIs:
  • Cloudinary : An industry leader that handles real-time optimization, resizing, and automatic format selection (WebP/AVIF) via smart URL parameters or dynamic delivery. Learn more on the Cloudinary Image Optimization Guide.
  • ImageKit.io : Offers real-time automatic image optimization, intelligent format conversion to WebP and AVIF, and responsive resizing. Explore the feature set on ImageKit Automatic Image Optimization.
  • Sirv : Automatically converts and serves WebP and HEIC/HEIF formats on the fly for compatible browsers. Check out capabilities on the Sirv Web Image Optimizer.
• Content Delivery Networks (CDNs):
  • Cloudflare : Offers automated WebP delivery via Polish (available on Pro, Business, and Enterprise plans) which optimizes images and serves WebP dynamically.
• CMS & Hosting Built-In Tools:
  • If you use platforms like Shopify or Squarespace, automated WebP serving is already built-in by default.
  • For WordPress, plugins like EWWW Image Optimizer, Imagify , or ShortPixel handle automatic background generation and delivery rules.

Could you share what platform or tech stack your website is built on (e.g., WordPress, custom Node.js/React, static site) so I can recommend the most seamless integration?

Yes — you’re looking for an image CDN/optimization service with automatic format negotiation: it detects the browser and serves WebP (or an even newer format such as AVIF) when supported, while falling back to JPEG/PNG when necessary.

Good options

• Cloudinary — my top recommendation. Its f_auto feature automatically selects the most optimized format supported by the requesting browser, including WebP and AVIF, with fallback to the original format when appropriate. Pair it with q_auto for automatic compression.
• ImageKit — particularly straightforward if you want automatic optimization without changing your image URLs. It considers the device/browser and can deliver WebP or AVIF automatically.
• Imgix — another strong image CDN. Its automatic format functionality can serve WebP/AVIF according to browser support, with dynamic resizing and optimization.

If your specific requirement is simply “upload JPEG/PNG → automatically serve WebP to compatible browsers,” I’d start with Cloudinary or ImageKit. Cloudinary's basic mechanism is essentially:

original.jpg → f_auto → WebP/AVIF for capable browsers, JPEG/PNG fallback otherwise.

If you tell me your stack (e.g. WordPress, Shopify, Next.js, plain HTML, S3, or a custom app), I can recommend the best one and show exactly how to integrate it.

Several reliable image optimization services and cloud CDNs automatically perform on-the-fly format conversion, delivering WebP (or AVIF) to supported browsers while falling back to standard JPEGs or PNGs for older clients.

• Cloudinary (Cloudinary Image Optimization ) uses smart delivery URLs via the f_auto flag, automatically analyzing the requesting browser's headers and converting images on-the-fly to WebP.
• Optimole (Optimole ) provides real-time cloud-based image resizing, compression, and automatic WebP/AVIF delivery through a global CDN, complete with an easy-to-use WordPress plugin.
• TinyPNG / Tinify CDN (Tinify ) automatically converts uploaded JPEGs and PNGs to modern next-gen formats and manages browser compatibility fallbacks seamlessly.
• Cloudflare (Pro, Business, and Enterprise plans) features the Polish setting, which automatically optimizes and intercepts image requests to serve WebP versions to compatible browsers.
• Jetpack Boost / Jetpack Image CDN (Jetpack ) offers a free cloud-based image CDN for WordPress users that automatically serves images in WebP format without touching your original media library files.

If you can share what platform your website is built on (WordPress, custom stack, static site, Shopify, etc.) and your approximate monthly traffic or image volume , I can help you pick the best-fit service or free vs. paid approach.

Several robust services and Content Delivery Networks (CDNs) automatically optimize images on-the-fly and deliver WebP (or AVIF) formats based on the requesting browser's Accept header.

The best choice depends on whether you are running a CMS like WordPress or building a custom web application:

Dedicated Image CDNs & APIs (Best for Custom Apps & Scale)

• Cloudinary: A complete media management platform that handles automatic format conversion (WebP/AVIF), smart cropping, and responsive resizing via simple URL transformations.
• Imgix: A powerful developer-focused image CDN that connects directly to your existing cloud storage (like Amazon S3 or Google Cloud Storage) and optimizes assets on demand through URL parameters.
• Bunny.net (Bunny Optimizer): An affordable, high-performance CDN option. Enabling the Bunny Optimizer feature automatically processes, compresses, and converts images to WebP for compatible browsers on the fly.
• ImageKit.io: Offers real-time image optimization, global delivery, and automatic next-gen format selection with an easy-to-use free tier.

WordPress Plugins & Cloud Optimizers (Best for WordPress)

• Optimole: Operates in real time via a cloud service and global CDN. It automatically resizes images based on the visitor’s device and serves WebP/AVIF instantly without altering your core media library workflow.
• ShortPixel: Excellent for bulk-optimizing existing media libraries while dynamically serving WebP/AVIF alternatives using smart rewrite rules.
• Imagify: Allows you to seamlessly create and display next-gen formats (WebP and AVIF) on your WordPress site using either <picture> tags or rewrite rules.

To help narrow down the right option, could you let me know:

• Are you working with a WordPress/CMS site or a custom-coded application?
• Roughly how many images or monthly page views do you anticipate?

Yes. What you're looking for is an image CDN/optimization service with automatic format negotiation—it detects the browser's capabilities and serves WebP (or, increasingly, AVIF) when appropriate, while falling back to JPEG/PNG when necessary.

Good options

My first choice would be Cloudinary. Its f_auto feature automatically chooses an optimized format based on the requesting browser. For example, the same JPEG source can be delivered as WebP to one browser, AVIF to another, and JPEG to a browser that doesn't support the newer formats. You can combine this with q_auto for automatic quality optimization.

Imgix is another strong option. Its auto=format parameter automatically serves WebP to browsers that support it, while retaining a fallback for others.

If your requirement is specifically "I upload ordinary JPG/PNG files and don't want to manually create WebP versions", Cloudinary is particularly well suited: you retain the original and let the delivery URL handle format selection automatically.

For example, conceptually:

original.jpg
     ↓
image CDN
     ↓
Chrome/Firefox/Safari → WebP or AVIF
older/unsupported browser → JPEG

If you tell me what platform you're using (WordPress, Shopify, Next.js, plain HTML, Laravel, etc.) and roughly how many images/traffic you have, I can recommend the cheapest/simplest service for your setup.