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A PAC file generator is a simple tool used to create a Proxy Auto-Config file. This file tells your browser when to send traffic through a proxy and when to connect directly. There’s no need to write code; the generator creates the script for you in seconds.
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How to use the PAC file generator
- Enter your proxy details
- Proxy type (HTTP, SOCKS, SOCKS5)
- Proxy host (e.g., proxy.example.com)
- Proxy port (e.g., 8080)
- Choose a mode
- Proxy all except listed: Everything goes through the proxy unless on your bypass list.
- Only proxy listed: Only chosen sites go through the proxy; all else is direct.
- Add domains or patterns
- Example:
.google.comto bypass Google - Example:
*.internal.localfor local apps
- Example:
- Optional fallback
- Add a second proxy in case the first one fails.
- Generate the PAC
- Click Generate to see the script.
- Copy it or download it as
proxy.pac.
- Apply the PAC file
- On Windows: open Internet Options ▸ Connections ▸ LAN Settings ▸ Use automatic configuration script.
- On macOS: go to System Settings ▸ Network ▸ Proxies ▸ Automatic Proxy Configuration.
- Paste the file path or URL.
What is a PAC file generator?
A PAC file generator creates a small JavaScript file that controls the use of proxies. PAC stands for Proxy Auto-Config. Rather than setting up rules manually, the generator produces ready-made instructions.
The file includes conditions like:
- Proxy all traffic except certain websites
- Only proxy the domains you list
- Send local addresses directly without a proxy
This approach allows for flexibility in your setup. One PAC file can be used for browsers, apps, or entire operating systems.
How does a PAC file work?
A PAC file contains a function called FindProxyForURL. Whenever your computer makes a connection, the browser asks this function:
- Does this host need a proxy?
- Which proxy server and port should it use?
- Or should it go directly?
Example rule inside a PAC file:
|
1 2 3 |
if (dnsDomainIs(host, ".example.com")) { return "DIRECT"; } return "PROXY proxy.example.net:8080"; |
That means all traffic for .example.com goes directly, while everything else uses the proxy.
Why should you use a PAC file generator?
- Saves time: No manual coding or syntax errors.
- Flexible: Update one PAC file instead of reconfiguring every browser.
- Secure: Keep sensitive apps direct while tunneling other traffic through the proxy.
- Scalable: Works for personal use or large networks.
PAC files are especially useful if you run multiple proxies, use internal apps, or need split tunneling for work and personal browsing.
Common use cases
- Bypassing specific domains (e.g., intranet or cloud apps).
- Routing streaming services through a residential proxy.
- Protecting sensitive apps with a VPN while letting casual browsing go direct.
- Corporate networks that need selective access rules.
FAQs about PAC file generators
A proxy is the server that handles traffic. A PAC file is the script that decides when to use the proxy.
Yes, you usually need system or browser settings access. But you don’t need to install extra software.
Yes. You can define a main proxy, a fallback proxy, and a final “DIRECT” option.
Yes, if you generate it yourself. Avoid PAC files from unknown sources since they can redirect traffic.
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