Bulk conversion of an Apache .htaccess file into Nginx configuration means translating a focused document-root excerpt into review-ready Nginx lines while surfacing every condition, unfamiliar flag or ambiguous target as a line-numbered warning rather than silently emitting a guess. The htaccess to Nginx Converter operates on exactly that principle: it processes one bounded line at a time, ignores RewriteEngine On, preserves comments, maps a narrow RewriteRule flag set (L, R, R=301 and R=302) and three simple non-rewrite directives, and reports everything else with its original Apache line number. This is not a one-click migration from Apache to Nginx, because the two servers share a request-processing model that is fundamentally different. Apache discovers .htaccess files through directories and may be disabled by AllowOverride, while Nginx reads centralized configuration and selects server and location blocks before rewrite processing. Treating bulk conversion as a documented first pass — paste a focused excerpt, review every emitted line, resolve every warning against the official manuals, then assemble the result in the correct Nginx context — is what keeps a migration honest and reversible.
What "htaccess to nginx bulk" actually means
Searches for "htaccess to nginx bulk" almost always come from one of three situations: a server is moving from Apache to Nginx, an existing Nginx server is inheriting a written-by-someone-else .htaccess, or a developer wants to know whether a five-line rule file can be ported in one pass. In all three cases, the word "bulk" is misleading. A .htaccess file is not a flat list of equivalent Nginx directives. It is a per-directory overlay that Apache re-reads for every request through the path, while Nginx evaluates configuration once at startup and routes requests through a hierarchy of server and location blocks. Treating the converter as a bulk text replacer is the failure mode the tool explicitly rejects.
The htaccess to Nginx Converter instead treats "bulk" as bounded scope: paste one focused document-root excerpt, receive the lines the tool can translate with confidence, and read every warning about anything conditional, unfamiliar or syntactically ambiguous. Processing happens in the browser and the input is not sent to Lizely. The input stays under the operator's control while the tool produces an audit trail of what it touched and what it refused to touch. That audit trail is the actual deliverable, not a pile of plausible-looking Nginx lines.
The narrow directive subset the converter maps
Within that bounded scope, the converter recognizes a deliberately small set of Apache directives and maps each one to a single Nginx line. Three non-rewrite directives are covered, and RewriteRule is restricted to four flag combinations. The mapping is documented, repeatable and reviewable, which is the point of the tool.
The table below summarizes the supported subset, the Nginx line the converter emits, and the documented scope assumption behind each row.
| Apache .htaccess input | Nginx line emitted | Scope note |
|---|---|---|
| RewriteRule ^pattern substitution [L] | rewrite ^/pattern substitution last; | Pattern starts with caret and no slash; converter inserts the leading slash |
| RewriteRule ^pattern substitution [R=301] | rewrite ^/pattern substitution permanent; | Permanent redirect, cacheable by browsers and intermediaries |
| RewriteRule ^pattern substitution [R] | rewrite ^/pattern substitution redirect; | Temporary redirect |
| Options -Indexes | autoindex off; | Local directory-listing disablement |
| ErrorDocument 404 /local/path | error_page 404 /local/path; | Local path only, external URLs not covered |
| Header set X-Robots-Tag "value" | add_header X-Robots-Tag "value"; | Quoted set value, conditional headers not covered |
Two details deserve extra attention. First, an Apache RewriteRule pattern in a document-root .htaccess normally matches a path after the directory prefix has been removed, so it commonly begins with a caret and no leading slash. Nginx rewrite patterns see a URI that begins with a slash. The converter therefore inserts that leading slash for the supported root-context pattern; this is a documented scope assumption, not a universal transformation for nested .htaccess files, Alias mappings or location-specific Nginx blocks. Second, the automatic flag set is intentionally limited to L, R, R=301 and R=302. A permanent Apache redirect becomes the Nginx permanent flag, a temporary redirect becomes redirect, and an internal last rule becomes last. Unknown flags such as QSA, END, F, G, B or NC stop conversion for that rule because their details cannot be erased safely.
Convert a focused .htaccess excerpt in bulk
- Open the converter in a browser tab and isolate a focused document-root excerpt from your Apache configuration. Authentication, proxy logic, CMS front-controller rules and complex condition chains belong in a separate review pass; the tool is not designed for them.
- Paste the excerpt into the input area. The tool processes one bounded line at a time, ignores RewriteEngine On, preserves comments and only emits lines for directives inside its narrow conversion contract. The input stays in your browser and is not sent to Lizely.
- Read the emitted Nginx lines in order and note each line-numbered warning. Every warning refers back to a specific Apache line number so you can match it against the Apache mod_rewrite introduction and the Nginx core error_page documentation before changing anything on the server.
- Resolve each warning manually. RewriteCond lines, RewriteRule lines with unknown flags, and rules whose target is a single dash are deliberately withheld; do not invent a replacement. Add the resolved lines to your Nginx configuration in the correct server or location block.
- Save the assembled fragment under version control, then continue with the validation steps below before reloading Nginx. If you are still drafting the bulk conversion, return to the converter and paste another focused excerpt to extend the audit trail.
Why line-numbered warnings matter more than silent guessing
The warnings are not a limitation to be worked around. They are the audit trail that makes the migration safe. Three categories of input are always reported rather than emitted.
First, RewriteCond lines are never translated automatically. Apache conditions can inspect HTTPS state, host names, files, directories, query strings, headers and captured groups, and their evaluation order matters. When a RewriteRule follows a condition, the converter suppresses the rule too, rather than emitting an unconditional redirect that could change traffic, create a loop or expose a route. A reader who wants a deeper discussion of this trade-off can compare the converter's behaviour with the broader question raised in Convert Apache .htaccess to Nginx Rules Without Guesswork.
Second, unknown flags stop conversion for that rule. The supported RewriteRule flag set is L, R, R=301 and R=302. Flags such as QSA, END, F, G, B or NC change semantics that the converter cannot erase safely. For example, [F] forbids a request, [G] forces a gone response, [B] escapes backreferences in the substitution and [NC] makes the pattern case-insensitive. Mapping any of those to last, redirect or permanent would silently change traffic. The warning is the result, not a missing feature.
Third, the Apache no-substitution target represented by a single dash is withheld. It often combines with flags that alter access or processing without changing the URI, and a literal dash is not a safe Nginx replacement. A converter that silently writes plausible-looking but non-equivalent configuration is more dangerous than one that leaves explicit work, and the warning is part of the result.
Assemble the fragment and validate before reload
The converter output is a fragment, not a complete nginx.conf. It does not create an http, server or location block, choose a listen port, set server_name, configure TLS, locate a document root, preserve PHP routing, forward a proxy, or define logs. Each reviewed line has to be placed in the correct context according to the official Nginx directive documentation and the actual application architecture. A line can be syntactically valid yet wrong for its context.
Before any reload, back up the active configuration and keep an open recovery session. Run nginx -t to validate the assembled configuration, then stage representative requests against the new server or location block to confirm the response Location header, status code and headers. Permanent redirects deserve extra care because browsers and intermediaries may cache them. A safe order is to start with temporary redirects in a controlled environment, confirm old paths, new paths, query strings, alternate hosts and HTTPS behaviour, and only then switch to permanent. The mechanics of swapping in a reviewed configuration without downtime are covered in How to Make Nginx Reload Config Without Downtime; the point is that the bulk conversion is finished only when the assembled file passes nginx -t, the staged tests match expectations and the active configuration is safely backed up.
If the source contains authentication, authorization, hotlink protection, proxy logic, CMS front-controller rules or complex conditions, treat the migration as engineering work rather than bulk text replacement. The converter is at its best as an inventory assistant: paste one focused excerpt, review the converted count, resolve every warning, assemble the result in a version-controlled Nginx file and validate it on staging.