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

[!IMPORTANT] WPsigner requires HTTPS for production use. All signing URLs must be served over SSL to ensure security and legal compliance.

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Recommended Hosting Providers

Based on performance, reliability, and WPsigner compatibility, we recommend these hosting providers:

Premium Managed WordPress

Provider	Starting Price	Why We Recommend
Cloudways	$14/mo	Best performance, DigitalOcean/Vultr/AWS options, full server control
Kinsta	$35/mo	Google Cloud infrastructure, excellent support, CDN included
WP Engine	$25/mo	Enterprise-grade, excellent uptime, staging environments
Pressable	$25/mo	WordPress.com infrastructure, Jetpack included, excellent reliability
Flywheel	$15/mo	Designer-friendly, great for agencies, easy collaboration

VPS & Cloud (Full Control)

Provider	Starting Price	Why We Recommend
DigitalOcean	$6/mo	Simple, reliable, great for developers
Vultr	$6/mo	High performance, global locations
Linode (Akamai)	$5/mo	Excellent network, longstanding reputation
Hetzner	€4/mo	Best value in Europe, powerful servers

Budget-Friendly Shared Hosting

Provider	Starting Price	Notes
SiteGround	$3/mo	Good support, auto-updates
Hostinger	$2/mo	Affordable, decent performance
A2 Hosting	$3/mo	Turbo servers available

[!TIP] For best results with WPsigner, we recommend Cloudways or Kinsta. They offer the PHP configuration flexibility and server resources needed for processing large PDF documents.

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Hosting Features to Look For

When choosing a host, ensure they offer:

Must-Have Features

• PHP 8.0+ - Modern PHP for best performance
• OpenSSL support - Required for digital signatures
• HTTPS/SSL - Free Let’s Encrypt or included SSL
• WP-Cron support - Or real cron access for reliability
• File upload limits - At least 32MB for large documents

Nice-to-Have Features

• Staging environment - Test updates before going live
• Automatic backups - Daily backups with easy restore
• CDN included - Faster global document delivery
• SSH access - For advanced troubleshooting
• Email deliverability - Or integrate with SMTP service

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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. Download WPsigner - Get the latest version
2. Installation Guide - Step-by-step setup
3. Quick Start - Create your first document