# Reverse Proxy vs Load Balancer

URL: https://softwaredictionary.org/compare/reverse-proxy-vs-load-balancer
Last updated: 2026-09-30

In short: A reverse proxy forwards requests to the servers behind it and adds TLS, caching and security, while a load balancer spreads load so no server is overloaded.

## What is the difference between a reverse proxy and a load balancer?

A reverse proxy is a server that accepts requests from clients on behalf of one or more backend servers, forwards them and returns the responses, so clients never talk to the backends directly. A load balancer distributes incoming traffic across a pool of servers using an algorithm such as round robin or least connections, and removes unhealthy servers from the pool.

The difference is their main purpose. A reverse proxy is the front door: it terminates TLS, caches and compresses responses, rewrites URLs, routes paths like `/api` and `/app` to different services, and hides the internal network. A load balancer is about distribution and availability: it only makes sense when there are several servers to share the work, and it can operate at layer 4 (TCP and UDP) or layer 7 (HTTP).

In practice the roles overlap heavily. Most reverse proxy servers can also load balance, and every layer-7 load balancer is a kind of reverse proxy, so one component often does both jobs. A common setup puts a layer-4 load balancer at the edge, spreading traffic across several reverse proxies that then route requests to application servers.

A common misconception is that a reverse proxy is only useful with many servers. Even with a single backend, it adds TLS, caching, rate limiting and protection. In the other direction, a layer-4 load balancer does not read HTTP at all, so it cannot route by URL or cache responses.

| Aspect | Reverse Proxy | Load Balancer |
| --- | --- | --- |
| Main job | Act as the single front door for backend servers | Spread traffic across multiple servers |
| Number of backends | Useful even with just one | Needs a pool of two or more |
| Network layer | Layer 7: understands HTTP | Layer 4 (TCP/UDP) or layer 7 (HTTP) |
| Typical features | TLS termination, caching, compression, URL routing | Health checks, balancing algorithms, sticky sessions, failover |
| Security role | Hides backends, filters requests, enforces rate limits | Removes failed servers and hides backend addresses |
| Scope | Usually one site or a group of services | Can span servers, availability zones or regions |

## Choose Reverse Proxy when

- You need TLS, caching or compression in front of an app.
- You want to route different URL paths to different services.
- You have a single backend but want to hide and protect it.

## Choose Load Balancer when

- Traffic is more than one server can handle.
- The service must stay up when individual servers fail.
- You are balancing non-HTTP traffic, such as database or game connections.

## Frequently asked questions

**Is a load balancer a reverse proxy?**

A layer-7 load balancer is a kind of reverse proxy, because it receives client requests and forwards them to backends. A layer-4 load balancer only forwards network connections and doesn't inspect HTTP.

**Can one server be both a reverse proxy and a load balancer?**

Yes. Most modern reverse proxy servers can spread traffic across several backends, so small and medium systems often use one component for both roles.

**What is the difference between a reverse proxy and a forward proxy?**

A forward proxy acts for clients that reach out to the internet, while a reverse proxy acts for servers that receive traffic from the internet.

---

Software Dictionary: https://softwaredictionary.org/ · https://softwaredictionary.org/llms.txt