Published on May 21, 2025
Amazon CloudFront is a Content Delivery Network (CDN) service from Amazon Web Services (AWS). It delivers your website's content (images, videos, APIs, and files) faster to users around the world by caching that content at servers physically close to them.
If you've just started exploring AWS, or you're wondering whether CloudFront is the right tool for your project, this guide covers the essentials: what it is, how it works, what it's good for, and when to use it.
Looking for the full technical deep-dive? Read our Amazon CloudFront Ultimate Guide →
A Content Delivery Network (CDN) is a network of servers distributed across the globe. When someone visits your website, instead of their request travelling all the way to your origin server (which might be in a single data centre in Virginia, for example), the CDN serves a cached copy of your content from a server much closer to them.
The result: faster load times, lower server load, and a better experience for every user, regardless of where in the world they are.
CDNs are particularly useful for:
Amazon CloudFront is AWS's native CDN, and it's what most teams on AWS use to solve these problems. If you want a broader introduction to how CDNs work before diving into CloudFront, read our What is a CDN? guide first.
CloudFront operates through a global network of Edge Locations: AWS data centres positioned around the world. Here's what happens when a user requests content from your site:
CloudFront checks whether the content is already cached at the Edge Location nearest to the user. If it is, it serves it immediately with minimal latency.
If the content isn't cached yet, CloudFront retrieves it from your origin server (an S3 bucket, EC2 instance, load balancer, or any custom HTTP server), serves it to the user, and stores a copy at the edge for future requests.
All subsequent requests for that content from nearby users are served from the edge cache, not your origin. This continues until the cache expires, based on the TTL (Time to Live) rules you configure.
The practical effect: a user in Helsinki, one in São Paulo, and one in Tokyo all get your content from a server close to them, not routed through one central data centre.
CloudFront runs on a network of 600+ Points of Presence across 100+ cities in 50+ countries. Content reaches users everywhere with minimal delay.
CloudFront scales automatically with your traffic: no capacity planning, no pre-provisioning. It handles steady traffic and sudden spikes equally well.
CloudFront integrates natively with AWS Shield (DDoS protection), AWS WAF (application firewall), and AWS Certificate Manager (free SSL/TLS certificates). Your content is encrypted in transit and protected at the edge before threats ever reach your origin.
Your origin doesn't have to be AWS-native. CloudFront works with S3 buckets, EC2 instances, load balancers, API Gateway endpoints, and any custom HTTP/HTTPS server, including servers outside of AWS entirely. This makes it a viable Amazon CDN option even for hybrid architectures.
CloudFront uses pay-as-you-go pricing based on data transferred and requests made. There's no upfront cost and no minimum commitment. A Free Tier covers 1 TB of data transfer and 10 million requests per month for the first 12 months.
For a full breakdown of costs by region and use case, see our CloudFront Pricing Guide →
Serving content from an edge server close to the user reduces the physical distance data travels, which directly reduces page load time. This matters for user experience and for SEO: Google uses Core Web Vitals metrics like TTFB and LCP as ranking signals, and CloudFront improves both.
Every request served from the edge cache never hits your origin. During a traffic spike (a product launch, a viral moment, a seasonal sale) CloudFront absorbs the load so your backend doesn't have to.
CloudFront acts as a protective layer in front of your infrastructure. DDoS attacks are absorbed at the edge. WAF rules block malicious bots and injection attempts before they reach your application. SSL/TLS encryption is handled end-to-end.
You don't run or maintain the CDN infrastructure. AWS manages the global edge network; you configure a distribution and point it at your origin. Scaling happens automatically.
Data transfer out via CloudFront Edge Locations is typically priced lower than equivalent data transfer directly from EC2 or S3 in most regions. Combined with reduced origin load, CloudFront generally lowers total infrastructure spend for content-heavy applications.
Page speed is a Google ranking factor. Faster TTFB (Time to First Byte) and LCP (Largest Contentful Paint), both directly improved by edge caching, contribute to better Core Web Vitals scores and improved organic search performance.
Pair CloudFront with an S3 bucket to serve a static website or deliver CSS, JS, and image assets globally. Origin Access Control (OAC) ensures your S3 bucket is never directly exposed to the public internet.
CloudFront supports on-demand video (HLS, DASH) and live streaming, delivering consistent playback performance to viewers worldwide regardless of connection speed or device.
CloudFront can cache API responses at the edge and route dynamic requests over AWS's optimised backbone, reducing API latency for applications with global users.
Deliver installers, firmware updates, and large binaries at scale without straining your origin. CloudFront handles high volumes of concurrent downloads efficiently.
Faster product images, JS bundles, and checkout flows. Geo-restriction capabilities help with regional compliance. Signed URLs protect time-limited or personalised content.
For SaaS products with customers across multiple regions, CloudFront reduces application latency and ensures consistent performance, without building multi-region infrastructure from scratch.
CloudFront is the natural choice if you're already building on AWS. The integration with S3, EC2, Lambda, WAF, Shield, and Route 53 is native: you're not stitching together third-party tools.
If your stack is not AWS-based, or you prefer a simpler flat-rate pricing model, alternatives like Cloudflare may be worth evaluating. But for AWS workloads, especially those involving S3, API Gateway, or serverless architectures, CloudFront is typically the right starting point.
"Building a marketplace on top of AWS requires more than picking the right services. It requires an architecture that can isolate clients cleanly, deploy consistently across environments, and stay cost-efficient while the customer base is still growing."
— Eugene Orlovsky, CEO at Perfsys
See how this plays out in practice: Tibica: Serverless Cloud Marketplace on AWS
If you're not sure whether CloudFront is the right fit for your architecture, Perfsys AWS consultants can review your setup and recommend the right approach.
Getting started with CloudFront typically takes around 15 minutes:
For detailed configuration steps, including cache behaviour settings, Origin Access Control for S3, TTL rules, and Lambda@Edge, see the full setup guide in our Ultimate Guide (linked below).
💡 Lambda@Edge lets you run lightweight functions at CloudFront edge locations, so you can customize content delivery (redirects, A/B tests, auth checks) without routing requests back to your origin. CloudFront Functions is a lighter, lower-cost option for simple request/response transformations. Both are covered in the Ultimate Guide.
Amazon CloudFront is AWS's content delivery network. For teams building on AWS, it's the most integrated and straightforward CDN available. It caches your content at 600+ Edge Locations worldwide, protects your origin from traffic spikes and attacks, and delivers faster load times to users everywhere on a pay-as-you-go model with no upfront commitment.
Setting up CDN correctly the first time saves you cost and headaches later. Perfsys AWS consultants help SMBs and startups get their AWS infrastructure right from the start.
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