System Requirements

Before installing WPsigner, ensure your server meets these requirements for optimal performance and full feature support.

Minimum Requirements

Component	Minimum	Recommended
WordPress	5.8+	6.4+
PHP	7.4+	8.1+
MySQL	5.7+	8.0+
MariaDB	10.3+	10.6+
Memory Limit	128MB	256MB+
Max Upload Size	10MB	64MB+
Max Execution Time	30s	120s+

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Required PHP Extensions

These extensions are essential for WPsigner to function properly:

Extension	Purpose	Check Command
openssl	Digital signatures, PDF sealing, certificate management	php -m | grep openssl
gd OR imagick	Image processing, signature rendering	php -m | grep -E "gd|imagick"
mbstring	Multi-byte string handling for international characters	php -m | grep mbstring
curl	Webhook delivery, external API calls	php -m | grep curl
json	API responses, data storage	php -m | grep json
zip	Document packaging and export	php -m | grep zip

Optional But Recommended

Extension	Purpose
intl	Better date/time formatting for international users
exif	Image orientation handling for uploaded signatures
fileinfo	MIME type detection for secure file uploads

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Server Configuration

PHP Settings (php.ini)

For optimal performance with large documents, adjust these settings:

; Recommended PHP settings for WPsigner
memory_limit = 256M
upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 120
max_input_vars = 3000

OpenSSL Requirements

WPsigner uses OpenSSL for:

• Digital certificate generation (self-signed)
• PDF digital signatures
• Secure webhook signatures (HMAC-SHA256)

Minimum OpenSSL Version: 1.0.2
Recommended: 1.1.1 or higher

To check your OpenSSL version:

openssl version

File Permissions

WPsigner needs write access to these directories:

Directory	Permission	Purpose
wp-content/uploads/	755	Document storage
wp-content/wpsigner-secure/	750	Signed PDFs, certificates

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WordPress Configuration

Recommended Settings

Setting	Recommended Value	Why
Permalinks	Post name (/%postname%/)	Required for signing URLs
WP Cron	Enabled	Auto-reminders, webhook delivery
SSL Certificate	Required	Secure signing experience

HTTPS Requirement

WPsigner requires HTTPS for production use. All signing URLs must be served over SSL to protect signing sessions and data in transit.

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Hosting Compatibility

WPsigner runs on standard WordPress hosting — including small shared-hosting sites — when the requirements above are met.

For recommended providers, shared hosting tips, WAF notes, and a go-live checklist, see Hosting Compatibility.

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Checking Your Server

Quick Compatibility Check

After installing WordPress, you can check your server’s compatibility:

1. Go to Tools → Site Health
2. Click Info tab
3. Expand Server section
4. Verify PHP version, extensions, and limits

Manual PHP Info Check

Create a temporary file phpinfo.php in your WordPress root:

<?php phpinfo(); ?>

Visit yourdomain.com/phpinfo.php to view all PHP settings.

Caution

Delete this file immediately after checking. It exposes sensitive server information.

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Troubleshooting Common Issues

”OpenSSL extension not found”

Contact your hosting provider to enable OpenSSL, or for VPS:

sudo apt-get install php-openssl
sudo systemctl restart apache2

“Memory limit exhausted”

Add to wp-config.php:

define('WP_MEMORY_LIMIT', '256M');

“Upload file size too large”

For Apache, add to .htaccess:

php_value upload_max_filesize 64M
php_value post_max_size 64M

For Nginx, add to server block:

client_max_body_size 64M;

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Next Steps

Once your server meets all requirements:

1. Hosting Compatibility - Confirm your host is a good fit
2. Download WPsigner - Get the latest version
3. Installation Guide - Step-by-step setup
4. Quick Start - Create your first document