4chan X adds features to anonymous imageboards through a browser userscript.
4chan Captcha Solver
This userscript project addresses 4chan captcha solving, and its repository invites development contributions.
About 4chan Captcha Solver
4chan Captcha Solver is an open-source userscript for 4chan. It fills in the captcha automatically when the captcha loads, using trained model weights. For slider captchas, it moves the slider into position on its own. If the automatic slider placement is wrong, the user can move the slider manually and press the Solve button to run the solution again.
The project is based on an original userscript by AUTOMATIC1111 and is licensed under GPL-3.0. The repository includes an alternative script that uses Tensorflow.js with a WebAssembly backend. The author reports that this version solves captchas about 150% faster than the CPU backend on the author's own devices. The script has no error handling. If solving fails, the reason appears in the browser's JavaScript console. Firefox and LibreWolf users with privacy.resistFingerprinting enabled must grant canvas permission to 4chan.org, or the script will not work. The model files are large, so the author states the script cannot be uploaded to userscript hosting sites.
Key features
- Fills in captchas automatically when they load on 4chan
- Moves slider captchas into position automatically
- Lets users adjust the slider manually and rerun the solution
- Alternative WebAssembly script using the Tensorflow.js backend
- Handles a slider puzzle that a January 2024 update notes was used on red boards
- Optional captcha saving feature added in January 2024
Best for: Developers who want to study, modify, or contribute to an open-source 4chan captcha userscript.
Good for
- Released under the GPL-3.0 open-source license
- Author reports the WebAssembly version is about 150% faster than the CPU backend on their devices
- Manual slider adjustment is available when automatic detection is wrong
Watch out for
- No error handling; failure reasons appear only in the browser JavaScript console
- Firefox and LibreWolf with privacy.resistFingerprinting require canvas permission for 4chan.org
- Large model files mean the script cannot be uploaded to userscript hosting sites
4chan Captcha Solver at a glance
- Category
- Marketing & SEO › Social Media Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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4chan Captcha Solver FAQ
Does the script need extra setup in Firefox or LibreWolf?
If privacy.resistFingerprinting is enabled in about:config, you must grant canvas permission to 4chan.org, or the script will not work.
What happens if the script fails to solve a captcha?
The script has no error handling. The reason for the failure is shown in the browser's JavaScript console.
What license does the project use?
The repository is licensed under GPL-3.0, and the repository invites development contributions.
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