PDF Ink Lite – Free PDF Watermark & Password Protection

76 Quality Score

Active Installs

15/30

With 2,000 active installs, this is a niche plugin rather than a mainstream choice, and the popularity score reflects a smaller user base than its alternatives.

Update Freshness

25/25

The plugin was updated within the last week before this assessment, requires only PHP 7.4, and is tested against WordPress 7.0, signalling very active upkeep.

User Rating

14/15

Users rate it 92 out of 100 across 50 reviews, which is a strong approval signal for a niche tool.

Support Health

8/15

Only 3 support threads have been opened, with 2 resolved, giving a thin picture of support responsiveness, though the resolution rate is reasonable.

WP Compatibility

15/15

It is tested with WordPress 7.0, requires PHP 7.4, and works without Ghostscript, so compatibility with modern stacks is solid.

Scores higher than 50% of indexed plugins

About

Watermark and password protect PDFs with WooCommerce, EDD, and Download Monitor. No Ghostscript required, PHP 8+ compatible. Since 2014 (FKA WaterWoo)

Active Installs 2k+

Rating ★★★★½ 4.6/5

Last Updated 2026-09-08 2:34pm GMT

Requires WordPress 7.0+

Tested Up To 7.1

Requires PHP 7.4+

✓ No known vulnerabilities

What It Does

PDF Ink Lite adds password protection and watermark overlays to PDF files sold or delivered through WooCommerce, Easy Digital Downloads, or Download Monitor. It works entirely in PHP, so no Ghostscript or external binary dependencies are needed on your server. The plugin processes downloads on the fly so the original file stays untouched on disk.

Who It's For

This plugin is a good fit for sellers of digital products, ebooks, courses, design templates, or research papers who need to deter casual sharing without investing in a full DRM solution. It works best on small to mid-sized stores where the owner controls the distribution channel and wants a lightweight, code-based layer of protection rather than a hosted service.

Who Should Skip It

If you run a large catalogue, need per-user watermarking with buyer identity, or require enterprise-grade encryption and access logging, look elsewhere. Likewise, anyone selling non-PDF downloads (ZIPs, video, audio) will get no value from this plugin since it only processes PDF files.

The Bottom Line

PDF Ink Lite does one thing, watermarking and password-protecting PDFs at download time, and it does that with minimal server overhead and no Ghostscript requirement. Its 76 out of 100 quality score reflects a smaller install base more than any functional weakness. For the right seller, it is a practical and well-maintained choice; for anyone outside that niche, the alternatives listed above will serve better.

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