PDF Ink Lite – Stamp PDFs with Customer Data
by Little Package 4.6 (49 reviews)

PDF Ink Lite – Stamp PDFs with Customer Data

PDF Ink Lite applies custom watermarks & passwords to simple PDFs upon WooCommerce, Download Monitor & Easy Digital Downloads file downloads.

Compatible with WP 6.9
v4.0.8 Current Version v4.0.8
Updated 1 month ago Last Update on 19 Dec, 2025
Synced 6 hours ago Last Synced on
Rank
#5,017
No change
Active Installs
2K+
-15.8%
KW Avg Position
80.3
-0.2 better
Downloads
78.5K
+4 today
Support Resolved
50%
No change
Rating
92%
Review 4.6 out of 5
4.6 (49 reviews)

Next Milestone 3K

Total Progress 37.9%
2K+ 3K+
599
Ranks to Climb
-
Growth Needed
8,000,000
Active Installs
Pro

Unlock Exact Install Count

See the precise estimated active installs for this plugin, calculated from real-time ranking data.

  • Exact install estimates within tiers
  • Track install growth over time
  • Milestone progress predictions
Upgrade to Pro
Need 621 more installs to reach 3K+

Rank Changes

5,001 5,007 5,012 5,018 5,023 13-01-2026 14-01-2026 15-01-2026 16-01-2026 17-01-2026 18-01-2026 19-01-2026 20-01-2026
4,997 5,007 5,016 5,026 5,035 05-01-2026 06-01-2026 07-01-2026 08-01-2026 09-01-2026 10-01-2026 11-01-2026 12-01-2026 13-01-2026 14-01-2026 15-01-2026 16-01-2026 17-01-2026 18-01-2026 19-01-2026 20-01-2026
4,994 5,011 5,029 5,047 5,064 21-12-2025 22-12-2025 23-12-2025 24-12-2025 25-12-2025 26-12-2025 27-12-2025 28-12-2025 29-12-2025 30-12-2025 31-12-2025 01-01-2026 02-01-2026 03-01-2026 04-01-2026 05-01-2026 06-01-2026 07-01-2026 08-01-2026 09-01-2026 10-01-2026 11-01-2026 12-01-2026 13-01-2026 14-01-2026 15-01-2026 16-01-2026 17-01-2026 18-01-2026 19-01-2026 20-01-2026
4,994 5,011 5,029 5,047 5,064 22-10-2025 23-10-2025 24-10-2025 25-10-2025 26-10-2025 27-10-2025 28-10-2025 29-10-2025 30-10-2025 31-10-2025 01-11-2025 02-11-2025 03-11-2025 04-11-2025 05-11-2025 06-11-2025 07-11-2025 08-11-2025 09-11-2025 10-11-2025 11-11-2025 12-11-2025 13-11-2025 14-11-2025 15-11-2025 16-11-2025 17-11-2025 18-11-2025 19-11-2025 20-11-2025 21-11-2025 22-11-2025 23-11-2025 24-11-2025 25-11-2025 26-11-2025 27-11-2025 28-11-2025 29-11-2025 30-11-2025 01-12-2025 02-12-2025 03-12-2025 04-12-2025 05-12-2025 06-12-2025 07-12-2025 08-12-2025 09-12-2025 10-12-2025 11-12-2025 12-12-2025 13-12-2025 14-12-2025 15-12-2025 16-12-2025 17-12-2025 18-12-2025 19-12-2025 20-12-2025 21-12-2025 22-12-2025 23-12-2025 24-12-2025 25-12-2025 26-12-2025 27-12-2025 28-12-2025 29-12-2025 30-12-2025 31-12-2025 01-01-2026 02-01-2026 03-01-2026 04-01-2026 05-01-2026 06-01-2026 07-01-2026 08-01-2026 09-01-2026 10-01-2026 11-01-2026 12-01-2026 13-01-2026 14-01-2026 15-01-2026 16-01-2026 17-01-2026 18-01-2026 19-01-2026 20-01-2026
Current #5,017
Change
Best #

Upgrade to Pro

Unlock 30-day and 90-day rank history charts with a Pro subscription.

Upgrade Now

Active Installs Growth

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

Downloads Growth

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

Upgrade to Pro

Unlock 30-day, 90-day, and yearly download history charts with a Pro subscription.

Upgrade Now

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 4 of 4
Keyword Position Change Type Updated
Stamp 21 Tag 18 hours ago
pdf protection 91 Tag 18 hours ago
pdf password 97 Tag 18 hours ago
watermark 112 Tag 18 hours ago

Unlock Keyword Analytics

Track keyword rankings, search positions, and discover new ranking opportunities with a Pro subscription.

  • Full keyword position tracking
  • Historical ranking data
  • Competitor keyword analysis
Upgrade to Pro

Support Threads Overview

Resolved
Unresolved
2
Total Threads
1
Resolved
1
Unresolved
50%
Resolution Rate

Track This Plugin

Get detailed analytics, keyword tracking, and position alerts delivered to your inbox.

Start Tracking Free

Plugin Details

Version
4.0.8
Last Updated
Dec 19, 2025
Requires WP
4.9+
Tested Up To
6.9
PHP Version
7.4 or higher

Support & Rating

Rating
★ ★ ★ ★ ★ 4.6
Reviews
49
Support Threads
2
Resolved
50%

Keywords

Upgrade to Pro

Unlock keyword rankings, search positions, and detailed analytics with a Pro subscription.

Upgrade Now

Frequently Asked Questions

Common questions about PDF Ink Lite – Stamp PDFs with Customer Data

  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   Troubleshooting Steps In order of simplest/obvious to more difficult/less obvious...  
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. If your PDF has goofy syntax (and many do because good PDF syntax is "optional"), this plugin will not be able to read it. Use PDF Ink with SetaPDF-Stamper instead.
Choose a different font in the settings. Update WordPress, and all plugins including this plugin to the most recent versions. If your PHP version is the newest, try downgrading.
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. If using WooCommerce, go to WooCommerce -> Settings -> PDF Ink Lite -> Logging and turn logging on. If using Easy Digital Downloads, go to Settings -> Misc -> Debug Mode and turn on logs. Run the program again, then look at the logs (EDD logs are under the Tools tab). Check your WP debug logs. If logs suggest your PDF is "malformed" or "template does not exist," try using Apple Preview application to resave your PDF by clicking "Export as PDF" in the menu. Preview might fix bad PDF syntax and allow your PDF to be processed for watermarking.   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 the “Deja Vu,” “Furat,” or “M Sung” font 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.
  PDF Ink is intended to watermark PDF (.pdf) files. If you are specifically looking to watermark image files (.jpg, .jpeg, .gif, .png, .etc), you may want to look into a plugin such as Image Watermark.
  This plugin is just for PDF files, but the upgrade also works with EPUB files, and MOBI coverage is roadmapped. The plugin seems to break my PDF   PDF Ink Lite bridges your e-commerce PDFs and the open-source PDF reading library TCPDI and PDF writing TCPDF library. PDF Ink Lite functions by parsing/reading your PDF into memory the best it can, then adding a watermark to the PDF syntax and outputting a revised file. Between the reading and output, certain features may be lost and other features (interactive PDF elements like internal links and fillable forms) will be lost. This is a limitation of the open-source third-party libraries used (TCPDI/TCPDF) AND the wild-west nature of PDF syntax. It is not the fault of PDF Ink Lite, which simply connects your e-commerce to PDF manipulation libraries. Ultimately, PDF Ink Lite is best for simple, smaller-sized and well-formed PDFs. If you are serious about watermarking and/or encrypting complex PDF files, purchase PDF Ink. It includes other libraries you can try free, and also allows you to link purchased 3rd party (non-GPL) libraries (such as SetaPDF Stamper) which work on any PDF. You might even find that the free libraries (TCPDI/TCPDF) included with PDF Ink (paid) work better than here in the free version! 😉

Sign In / Register

You need to sign in or register to use this feature.