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wmk

wmk is a free, open-source Python command-line tool for placing image or text watermarks on images.

Place
#20 of 33
Score
6.3
wmk's website

What wmk is

wmk is a free, open-source Python command-line tool for placing image or text watermarks on images. It runs on Linux, macOS, and Windows, and supports JPG, JPEG, PNG, WEBP, TIFF, BMP, and GIF files. For batch work, it can process folders recursively or use glob patterns. Watermarks can go in any corner or the center, with opacity set from 0 to 100. A dry run previews planned output without writing files. Folder batches default to a watermarked directory and retain the source folder structure; existing destination files are protected unless overwrite is selected, with a _watermarked suffix used to avoid collisions. GIF processing is limited to the first frame. The README describes the tool as offline, keeping images on the user's machine. Install it with pip, pipx, or a cloned repository; it requires Python 3.10 or newer. The CLI is the main interface, with an optional Python library interface. The project is MIT-licensed and describes scriptable, repeatable workflows such as preparing product photos or photography deliveries.

Good

  • Works offline, keeping images on the user's machine.
  • Processes folders recursively or accepts glob patterns.
  • Offers five placement options and adjustable opacity.
  • Dry run previews outputs without writing files.
  • MIT-licensed with an optional Python library interface.

Watch out

  • Requires Python 3.10 or newer.
  • GIF processing handles only the first frame.
  • The primary interface is command-line.

Who it suits

wmk suits desktop users who want to watermark image collections locally or automate repeatable image workflows. It may also fit multimedia graphics users comfortable with a Python command-line tool.

Verdict

wmk provides batch watermarking, placement controls, and a preview option in a free, locally run CLI. Its first-frame-only GIF handling and Python requirement are worth considering before choosing it.

Plans and prices

From wmk's own pricing page, checked 11 Oct 2026.

All about pricing
PlanPriceWhat it gives you
add-watermarkFreeMIT-licensed Python CLI; no paid plans listed

The facts

Each one read from wmk's own pages, with the date it was checked.

What it does

Automation
The CLI is scriptable and the README describes it for repeatable workflows such as product photos and photography delivery.checked 11 Oct 2026
Batch processing
It can process folders recursively or accept glob patterns for batch watermarking.checked 11 Oct 2026
Dry run
A dry-run option prints planned outputs without writing files.checked 11 Oct 2026
GIF limitation
GIF processing handles only the first frame.checked 11 Oct 2026
Image formats
It supports JPG, JPEG, PNG, WEBP, TIFF, BMP, and GIF input and output.checked 11 Oct 2026
Input formats
The listed input and output formats are JPG, JPEG, PNG, WEBP, TIFF, BMP, and GIF.checked 11 Oct 2026
Install
The package can be installed with pip or pipx, or from a repository clone.checked 11 Oct 2026
Installation
The package can be installed with pip or pipx, or from a cloned source repository.checked 11 Oct 2026
Intended audience
The package metadata classifies the project for desktop end users and multimedia graphics.checked 11 Oct 2026
License
The repository provides the software under the MIT License, which permits use, copying, modification, distribution, sublicensing, and sale subject to its conditions.checked 11 Oct 2026
Local processing
The README describes the CLI as offline and says images stay on the user's machine.checked 11 Oct 2026
Output behavior
By default, batch folder output goes into a watermarked directory and preserves the folder's relative structure.checked 11 Oct 2026
Overwrite behavior
Without the overwrite option, existing destination files are not replaced and a _watermarked suffix is used to avoid collisions.checked 11 Oct 2026
Placement and opacity
Watermarks can be positioned at the top-left, top-right, bottom-left, bottom-right, or center, with opacity set from 0 to 100.checked 11 Oct 2026
Privacy
The README describes wmk as an offline tool and says images stay on the user's machine.checked 11 Oct 2026
Purpose
wmk is a Python command-line tool for adding image or text watermarks to images.checked 11 Oct 2026
Python library
The project also provides an optional Python library interface, while identifying the CLI as its primary interface.checked 11 Oct 2026
Python requirement
The package metadata requires Python 3.10 or newer.checked 11 Oct 2026
Support channel
The package metadata links to the repository's GitHub Issues page.checked 11 Oct 2026
Testing and checks
The README lists a pytest suite and Ruff lint and formatting checks as project trust signals.checked 11 Oct 2026

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