MineCaptcha
by jSdCool
MineCaptcha is a server-side Fabric mod that puts an image captcha in front of players joining a server, using a generated resource pack.
What it does
Server owners run the server once so the mod writes its config file, then set the method to IMAGE in minecaptcha.cfg. A Java program bundled with the mod is then run to generate a resource pack and a set of image mappings, which are stored with the server configuration. The resulting resourcepack.zip has to be combined with the server's own resource pack and distributed to players, while captchaimage.json is copied into the server's config folder.
Only the server needs the mod, so players join without installing anything on their side. The mod is published for Fabric on 1.21.8, 1.21.9, 1.21.10, 1.21.11, 26.1, 26.1.1, 26.1.2 and 26.2, with 1.1.3 for 26.2 as the latest file. It is open source under the MIT License and is described as compatible with vanilla servers.
Key features
Image captcha at join
Players must solve an image captcha before they can play, which the server can enable through the config file.
Config-driven method
The verification method is chosen in minecaptcha.cfg, where the IMAGE setting selects the picture-based check.
Generated image mappings
A bundled Java program produces a resource pack and the image mappings the captcha relies on.
Resource pack distribution
The generated resourcepack.zip is merged with the server resource pack so clients receive the captcha images on connect.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Public survival servers
Server owners who want to slow down bots and automated logins can add a captcha step before players reach the world.
Who it’s for: Server owners who run vanilla-compatible Java servers and are willing to combine a generated resource pack with their existing server resource pack.
How it compares
Simple Resource Loader is a Fabric and Quilt library that is open source under the GNU Lesser General Public License v3.0 only, with files for 1.21 – 26.3, and either side can run it. ResourcePack Server is a Fabric, server-side only mod under the MIT License, published for 1.19 – 1.21.1, so it covers older game versions than MineCaptcha. Pack Repos is open source under the Apache License 2.0 and targets 26.2 only, where either side can run it without the server requirement.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| MineCaptcha | Fabric | 1.21.8 – 26.2 | Server-side only | 2026-06-16 |
| Simple Resource Loader | Fabric and Quilt | 1.21 – 26.3 | Client or server, optional | 2026-03-25 |
| ResourcePack Server | Fabric | 1.19 – 1.21.1 | Server-side only | 2024-09-28 |
| Pack Repos | Fabric | 26.2 | Client or server, optional | 2026-08-19 |
Questions
Does MineCaptcha need to be installed on the client?
Which game versions does MineCaptcha support?
How is the captcha image set up?
In the catalog
MineCaptcha is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 13,894 mods support Minecraft 26.2.
More from jSdCool
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/minecaptcha
- Owner
- jSdCool
- Published
- 2025-08-21
- Updated on Modrinth
- 2026-06-16
- Facts verified
- 2026-10-15