PDF Ink Lite – Free PDF Watermark & Password Protection
by Canyon Webworks 4.6 (49 reviews)

PDF Ink Lite – Free PDF Watermark & Password Protection

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

Compatible with WP 6.9.4
v4.0.12 Current Version v4.0.12
Updated 2 weeks ago Last Update on 30 Mar, 2026
Refreshed 6 hours ago Last Refreshed on
Rank
#4,754
No change
Active Installs
2K+
No change
KW Avg Position
69.7
No change
Downloads
85.1K
+2 today
Support Resolved
0%
No change
Rating
92%
Review 4.6 out of 5
4.6 (49 reviews)

Next Milestone 3K

Total Progress 60.9%
2K+ 3K+
403
Ranks to Climb
-
Growth Needed
8,000,000
Active Installs
Pro

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Rank Changes

4,746 4,752 4,759 4,765 4,771 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
4,743 4,761 4,779 4,796 4,814 02-04-2026 03-04-2026 04-04-2026 05-04-2026 06-04-2026 07-04-2026 08-04-2026 09-04-2026 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
4,738 4,766 4,794 4,821 4,849 18-03-2026 19-03-2026 20-03-2026 21-03-2026 22-03-2026 23-03-2026 24-03-2026 25-03-2026 26-03-2026 27-03-2026 28-03-2026 29-03-2026 30-03-2026 31-03-2026 01-04-2026 02-04-2026 03-04-2026 04-04-2026 05-04-2026 06-04-2026 07-04-2026 08-04-2026 09-04-2026 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
4,711 4,798 4,884 4,970 5,057 17-01-2026 18-01-2026 19-01-2026 20-01-2026 21-01-2026 22-01-2026 23-01-2026 24-01-2026 25-01-2026 26-01-2026 27-01-2026 28-01-2026 29-01-2026 30-01-2026 31-01-2026 01-02-2026 02-02-2026 03-02-2026 04-02-2026 05-02-2026 06-02-2026 07-02-2026 08-02-2026 09-02-2026 10-02-2026 11-02-2026 12-02-2026 13-02-2026 14-02-2026 15-02-2026 16-02-2026 17-02-2026 18-02-2026 19-02-2026 20-02-2026 21-02-2026 22-02-2026 23-02-2026 24-02-2026 25-02-2026 26-02-2026 27-02-2026 28-02-2026 01-03-2026 02-03-2026 03-03-2026 04-03-2026 05-03-2026 06-03-2026 07-03-2026 08-03-2026 09-03-2026 10-03-2026 11-03-2026 12-03-2026 13-03-2026 14-03-2026 15-03-2026 16-03-2026 17-03-2026 18-03-2026 19-03-2026 20-03-2026 21-03-2026 22-03-2026 23-03-2026 24-03-2026 25-03-2026 26-03-2026 27-03-2026 28-03-2026 29-03-2026 30-03-2026 31-03-2026 01-04-2026 02-04-2026 03-04-2026 04-04-2026 05-04-2026 06-04-2026 07-04-2026 08-04-2026 09-04-2026 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
Current #4,754
Change
Best #

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Active Installs Growth

Active Installs 0,000,000+
Growth +0.0%
Peak 0,000,000

Downloads Growth

0 10 20 30 40 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
0 10 20 30 40 50 60 02-04-2026 03-04-2026 04-04-2026 05-04-2026 06-04-2026 07-04-2026 08-04-2026 09-04-2026 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
0 100 200 300 400 500 600 700 18-03-2026 19-03-2026 20-03-2026 21-03-2026 22-03-2026 23-03-2026 24-03-2026 25-03-2026 26-03-2026 27-03-2026 28-03-2026 29-03-2026 30-03-2026 31-03-2026 01-04-2026 02-04-2026 03-04-2026 04-04-2026 05-04-2026 06-04-2026 07-04-2026 08-04-2026 09-04-2026 10-04-2026 11-04-2026 12-04-2026 13-04-2026 14-04-2026 15-04-2026 16-04-2026 17-04-2026
0 200 400 600 800 1K 1.2K 17-01-2026 20-01-2026 23-01-2026 26-01-2026 29-01-2026 01-02-2026 04-02-2026 07-02-2026 10-02-2026 13-02-2026 16-02-2026 19-02-2026 22-02-2026 25-02-2026 28-02-2026 03-03-2026 06-03-2026 09-03-2026 12-03-2026 15-03-2026 18-03-2026 21-03-2026 24-03-2026 27-03-2026 30-03-2026 02-04-2026 05-04-2026 08-04-2026 11-04-2026 14-04-2026 17-04-2026
0 200 400 600 800 1K 1.2K 17-04-2025 29-04-2025 11-05-2025 23-05-2025 04-06-2025 16-06-2025 28-06-2025 10-07-2025 22-07-2025 03-08-2025 15-08-2025 27-08-2025 08-09-2025 20-09-2025 02-10-2025 14-10-2025 26-10-2025 07-11-2025 19-11-2025 01-12-2025 13-12-2025 25-12-2025 06-01-2026 18-01-2026 30-01-2026 11-02-2026 23-02-2026 07-03-2026 19-03-2026 31-03-2026 12-04-2026 17-04-2026
Downloads
Growth
Peak

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Reviews & Ratings

4.6
49 reviews
Overall 92%
5
42 (86%)
4
1 (2%)
3
1 (2%)
2
3 (6%)
1
2 (4%)

Tracked Keywords

Showing 3 of 3
Keyword Position Change Type Updated
pdf watermark 40 Tag 1 day ago
document protection 67 Tag 1 day ago
pdf password 102 Tag 1 day ago

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Plugin Details

Version
4.0.12
Last Updated
Mar 30, 2026
Requires WP
4.9+
Tested Up To
6.9.4
PHP Version
7.4 or higher

Support & Rating

Rating
★ ★ ★ ★ ★ 4.6
Reviews
49
Support Threads
0
Resolved
0%

Keywords

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Frequently Asked Questions

Common questions about PDF Ink Lite – Free PDF Watermark & Password Protection

  Oh, thanks for thinking of the countless volunteers who develop plugins for you to enjoy! In the PDF Ink Lite "Housekeeping" settings, you can check the "Attribution" box. This will add a super tiny, invisible watermark to page 2 of your PDF files, linking back to PDF Ink. The attribution mark is almost impossible to spot -- try it!
  You can find the PDF Ink settings page by clicking on the "Settings for XXX" link under the PDF Ink Lite plugin title on your WordPress plugins panel. Something is wrong   Here are some basic troubleshooting steps to start with. Below those is a link to further recommendations.  
Have you checked the PDF Ink Lite settings checkbox to "Enable watermarking?" Have you entered your PDF file names correctly in the second field if you've entered any at all? This field is case-sensitive. Make sure your PDF product downloads work without PDF Ink Lite activated, to narrow the problem. Try watermarking a different PDF (one you didn't create) to see if that PDF works. Try using a different font (in settings). Using cutting-edge PHP? Try a lower PHP version. Increase your PHP time limit and memory limits if they are set low (but don't set too high, either). Server limitations can stop this plugin from functioning well. Read more below under "Why does the watermark go off the page, create blank pages?".   Please - definitely - get in touch with your issues via the WordPress.org support forum before leaving negative feedback about this free plugin. To request help using the WordPress.org support forum, start here. Do not use the WordPress.org support forum for help with the full (paid) version of PDF Ink - that is against WordPress.org rules. Conversely, use the WordPress.org support channel -- not email -- for PDF Ink Lite (free). My watermark isn’t English   Try selecting a different font like “Deja Vu” in the plugin settings panel. One reason watermarks might not show up is because the watermark contains special characters but you're using a font which doesn’t support those characters. If none of the included fonts are subsetted for your language characters, you will need to programmatically add fonts yourself or look into purchasing the full version of this plugin, which has many more built-in fonts and supports font uploads.
  Maybe set your PDF to $0 (free) and "Privately Published" (for WooCommerce). Or maybe create a coupon in your shop to allow 100% free purchases. Don't share this coupon code with anyone! Test your watermark by purchasing PDFs from your shop using the coupon. It's a bit more tedious. If you want easier on-the-fly testing, purchase the full version of this plugin.
  Your watermark text string is too big or long for the page, and goes off it! Try decreasing font size or using the Y fine tuners to move the watermark back onto the page. Try lowering your "y-axis" value. This number corresponds to how many millimeters you want the watermark moved down the page. For example, if your PDF page is 11 inches tall, your Y-axis setting should be a deal less than 279.4mm in order for a watermark to show. The built-in adjustments on the settings page ultimately allow for watermarking on all document sizes. You may need to edit your watermark if it is too verbose. You can use a negative integer value for your Y-tuner and measure up from the bottom of the page. This is especially helpful if your PDF has variable sized pages.
  They are generated with a unique name and stored in the same folder as your original WordPress/Woo product media upload (usually wp-content/uploads/year/month/file). The unique name includes the order number and a time stamp. If your end user complains of not being able to access their custom PDF for some reason (most often after their max number of downloads is exceeded), you can find it in that folder, right alongside your original. If you are using Woo FORCED downloads, the plugin attempts to delete the watermarked files after being delivered. This isn't 100% reliable since it works on PHP shutdown. If you don't like attempted deletion, you can change it with the 'wwpdf_do_cleanup' filter hook (set it to FALSE). The paid version of this plugin has improved file handling/removal.
  Yes, you can serve the file untouched if watermarking fails, and avoid any error messages, by using the following filter code in your (child) theme functions.php file: add_filter( 'wwpdf_serve_unwatermarked_file', '__return_true' ); If you do not know how to edit your functions.php file, you can use the Code Snippets plugin to easily add this code to your WP site frontend.

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