Generate captcha text to hide text from bots

create_captcha_text.php

<?php

require_once 'vendor/autoload.php';

use Gregwar\Captcha\CaptchaBuilder;

// Create a captcha with the text "MilesCranmer@mastodon.social"
$builder = new CaptchaBuilder('MilesCranmer@mastodon.social');
$builder->setMaxBehindLines(10);
$builder->setMaxFrontLines(10);
// Change the "font" to wherever your desired font file is
$builder->build($width=2000, $height=800, $font='/Users/mcranmer/Library/Fonts/Roboto-Regular.ttf');
$builder->save('out.jpg', $quality=100);

Instructions:

1. Install php and composer (e.g., with brew: brew install php composer).
2. Create a folder and open a terminal in that folder. Run composer require gregwar/captcha to install gregwar's captcha library.
3. Tweak the text (above, 'MilesCranmer@mastodon.social') to your desired text.
4. Tweak the font with the location of your ttf file (on macOS, these are in your Library/Fonts folder).
5. Run php create_captcha_text.php in the terminal.

The image is out.jpg.

In case it's still legible to OCR, you can increase the number of lines by changing the 10s. You can also change the font.