Test & Validate .htaccess Rules Online Free

Your .htaccess file controls redirects, rewrites, access restrictions, and dozens of other Apache server behaviors — but one typo can break your entire site. Flipper File's .htaccess Validator and Tester lets you paste your file and instantly check for syntax errors, validate RewriteRule patterns, and understand what each directive does, all without touching your live server.

How to Test Your .htaccess File

1. Paste your .htaccess content into the editor on this page.
2. Click Validate & Analyze to scan the file for syntax issues.
3. Review the results — each directive is color-coded (valid, warning, or error).
4. Click any line to see a plain-English explanation of what that directive does.
5. Fix any flagged issues and re-validate until your file is clean.

Why Use Flipper File to Validate .htaccess?

• Instant syntax checking — Catch missing brackets, unbalanced flags, and malformed RewriteRule patterns before they cause a 500 error on your server.
• Plain-English explanations — Every recognized directive is explained in plain language so you understand what each line actually does.
• RewriteRule and RewriteCond analysis — The validator highlights the pattern, substitution, and flags of every rewrite rule and warns about common mistakes like missing [L] flags or infinite loops.
• Redirect chain detection — Identifies sequences of redirect rules that could create redirect loops or chains.
• WordPress-specific checks — Recognizes the standard WordPress .htaccess block and flags edits that could break pretty permalinks.
• 100% private — Your .htaccess content is never sent to any server. All validation runs locally in your browser.

Frequently Asked Questions

What is an .htaccess file?An .htaccess (hypertext access) file is a configuration file used by Apache web servers. It lets you control URL redirects, rewrite rules, access restrictions, caching headers, HTTPS enforcement, and much more — on a per-directory basis. Most WordPress, PHP, and shared-hosting sites rely heavily on .htaccess for SEO-friendly URLs.

Why does my .htaccess file break my site?

Apache parses .htaccess files line by line, and a single syntax error (a missing bracket, an invalid flag, or a malformed regex) causes Apache to return a 500 Internal Server Error for every request. This validator catches those errors before you deploy.

Can this tool test actual live redirects?

This tool validates syntax and analyzes your rules offline — it does not make live HTTP requests. For live redirect testing, use the Flipper File HTTP Redirect Tracer to follow real-world redirect chains.

What Apache directives does the validator support?

The validator recognizes all common Apache 2.4 directives including RewriteEngine, RewriteRule, RewriteCond, Redirect, RedirectMatch, Options, DirectoryIndex, ErrorDocument, Header, AddType, AuthType, Order, Allow, Deny, Require, and more.

Does this work for WordPress .htaccess files?

Yes — the validator explicitly recognizes the WordPress rewrite block (# BEGIN WordPress / # END WordPress) and flags modifications that could interfere with the index.php fallback that WordPress requires for pretty permalinks.

Can I validate .htaccess files for Nginx or other servers?

No — .htaccess is an Apache-specific configuration format. Nginx does not use .htaccess files. If you're using Nginx, you'll need to configure rewrites in your nginx.conf or server block instead.

Is my .htaccess content safe to paste here?

Completely. All processing happens in your browser using JavaScript — nothing is uploaded to any server, logged, or stored. Your configuration never leaves your computer.

What's the difference between Redirect and RewriteRule?

Redirect is a simpler directive for straightforward URL redirects (it matches literal paths). RewriteRule is more powerful — it supports regular expressions, conditions (RewriteCond), and can transform URLs in complex ways. For most simple redirects, Redirect 301 /old-path /new-path is cleaner and easier to maintain.