The maximum length of a URL can vary depending on the browser and the server. While there isn't a hard limit set by the URL specification itself, different browsers and servers impose their own practical limits.

1. General Guidance

• HTTP Specification: There is no official limit on URL length in the HTTP specification, but practical limitations do exist based on browsers, servers, and the underlying operating systems.
• Recommended Limit: To ensure compatibility across different browsers and servers, it's generally recommended to keep URLs under 2,000 characters.

2. Browser Limits

Here are some approximate limits on URL length for different popular browsers:

• Internet Explorer (IE):
  • URL Length Limit: 2,083 characters (maximum 2,048 characters for the path portion).
  • Note: IE is the most restrictive in terms of URL length. If your URL exceeds this limit, it may be truncated or cause errors.
• Google Chrome:
  • URL Length Limit: Around 32,767 characters.
  • Note: Chrome can handle very long URLs, but you should still keep URLs shorter for practical reasons like usability and server compatibility.
• Mozilla Firefox:
  • URL Length Limit: Around 65,536 characters.
  • Note: Like Chrome, Firefox can handle very long URLs, but it's advisable to avoid excessively long URLs.
• Safari:
  • URL Length Limit: Around 80,000 characters.
  • Note: Safari also supports long URLs, but again, long URLs can lead to other issues such as difficulty in sharing or bookmarking.
• Microsoft Edge:
  • URL Length Limit: Similar to Chrome, around 32,767 characters.
  • Note: Edge shares many characteristics with Chrome due to their shared Chromium engine.

3. Server Limits

In addition to browser limits, web servers can impose their own limits on URL lengths. For example:

• Apache: By default, Apache has a limit of 8,192 characters (LimitRequestLine directive), but this can be configured.
• NGINX: NGINX has a default limit of 4,096 characters (large_client_header_buffers directive), but this can also be adjusted.
• IIS (Internet Information Services): Has a default limit of 16,384 characters.

4. Practical Considerations

• Search Engines: Search engines like Google may truncate URLs in search results, and overly long URLs can negatively affect SEO.
• Usability: Extremely long URLs are difficult to read, share, and debug.
• Stability: Long URLs can cause issues with older software, URL encoders/decoders, and some email clients.

Summary

• Internet Explorer: Max 2,083 characters (most restrictive).
• Google Chrome, Firefox, Edge, Safari: Up to 32,767 to 80,000 characters, but practical usage should be far below this.
• Server limits: Often configurable, but commonly set around 8,192 characters by default.

To ensure broad compatibility and avoid issues, it’s advisable to keep URLs under 2,000 characters, even though modern browsers and servers can handle much longer URLs.