Choose HAProxy if your job is load balancing and proxying TCP and HTTP traffic for busy sites, with long-term support branches and fine control over connections. Choose nginx if you want a web server first that also proxies, caches and load balances, so one tool serves your files and fronts your apps. HAProxy's own guide says it isn't a static web server, and that's the clearest dividing line.
I read HAProxy's home page and its 3.2 starter guide, then nginx.org's home page, beginner's guide and licence. The two overlap on load balancing, but they were built with different centres of gravity.
HAProxy and nginx compared
| HAProxy | nginx | |
|---|---|---|
| Built as | Reverse proxy and load balancer for TCP and HTTP | Web server that is also a proxy, cache and load balancer |
| Serves files | No, its guide says it isn't a static web server | Yes, static and index files |
| TLS | Terminates, initiates or offloads SSL, per-SNI settings updated at runtime | SSL and TLS SNI support |
| Protection | Normalises TCP and HTTP, so malformed traffic isn't passed on | Access control, rate limiting and request mirroring |
| Release cycle | Two major versions a year; even branches are LTS for 5 years | Mainline and stable releases on nginx.org |
| Commercial | HAProxy Technologies | F5 |
| Free option (as of October 2026) | Yes, open source | Yes, open source |
What HAProxy is good at
HAProxy describes itself as a free, very fast and reliable reverse proxy offering high availability, load balancing and proxying for TCP and HTTP applications, suited to very high traffic sites. It ships with most mainstream Linux distributions and is often deployed by default on cloud platforms. Its starter guide lists its roles: a TCP proxy, an HTTP reverse proxy, an SSL terminator, a TCP and HTTP normaliser, a content-based switch and a server load balancer.
The normaliser role is easy to miss. Because HAProxy terminates connections itself, invalid packets, SYN floods and malformed HTTP requests aren't passed to your servers, which protects fragile back ends from protocol attacks. It can also switch traffic by content, so HTTP, HTTPS and SSH can share one port.
Why nginx covers more ground
nginx is an HTTP web server, reverse proxy, content cache, load balancer, TCP/UDP proxy and mail proxy in one. It serves static files with an open file descriptor cache, caches responses from FastCGI, uwsgi and SCGI back ends, rewrites URLs and proxies IMAP, POP3 and SMTP. You manage it in nginx.conf and reload without dropping connections.
That breadth means a small site can run on nginx alone. If you need one process that serves your site, terminates TLS and spreads traffic across a few app servers, nginx does all three, under the 2-clause BSD License.
The support cycle worth planning around
HAProxy publishes a clear maintenance policy. Since version 1.8 it releases two major versions a year; even-numbered branches are long-term support and maintained for 5 years, while odd-numbered stable branches get 12 to 18 months. The 3.4 LTS release added dynamic backends, which its news page calls one of the most requested features in the project's history. If you want to stay on one branch for years, that table tells you exactly how long.
How to decide
- Need a web server as well as a proxy? nginx.
- Running high-traffic TCP or HTTP load balancing in front of many servers? HAProxy was built for it.
- Want malformed traffic stopped before it reaches your apps? HAProxy's normalising is a plus.
- Want one tool for files, caching and proxying? nginx keeps it simple.
- You can also use both: HAProxy balancing traffic, nginx serving content.
If you're also working on delivery speed, see this comparison of CloudFront and BunnyCDN and the benefits of cloud hosting.
My advice on HAProxy or nginx
If your main problem is spreading heavy traffic across servers reliably, with fine control over connections and a long support branch, HAProxy is the specialist and it's very good at that one job. If you want a single tool that serves your site, caches it and balances a modest load, nginx is the more practical choice. I'd only add HAProxy in front of nginx once traffic or uptime needs make the extra layer worth running.
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Frequently asked questions
Can HAProxy serve static files?
No. HAProxy's starter guide says it isn't a static web server. nginx serves static and index files directly.
Does HAProxy do TCP load balancing?
Yes. HAProxy is a TCP proxy and server load balancer, and in TCP mode it makes balancing decisions for the whole connection.
How long are HAProxy LTS versions supported?
HAProxy's home page says even-numbered branches are LTS and maintained for 5 years; odd-numbered stable branches get 12 to 18 months.
Is nginx a load balancer?
Yes. nginx lists load balancing and fault tolerance for HTTP, plus generic TCP and UDP proxying with load balancing.
Are HAProxy and nginx free?
Both are open source. HAProxy Technologies and F5 sell commercial versions and support.
