KeyMapper for Windows

Quick summary

KeyMapper is a free, open-source key remapping utility for Windows developed by Stuart Dunkeld. It lets you reassign individual keys and build simple macros — for example, to launch programs or send a sequence of keystrokes — all from an easy-to-learn interface.

Using the onscreen keyboard

When you launch KeyMapper you see a visual keyboard layout where edits are made directly. Double-click any key to open a dialog that offers grouped choices for reassignment. The available groups include:

• Common actions (e.g., copy/paste, application shortcuts)
• Modifier keys (Shift, Ctrl, Alt and their variants)
• Media controls (volume, play/pause, track skip)

Select a replacement action or create a custom one, then confirm the change for that key.

Creating macros and custom tasks

Beyond simple key swaps, KeyMapper supports user-defined actions. You can:

• Configure a key to start an application
• Chain multiple keystrokes into a single macro for repetitive workflows
• Combine modifiers and regular keys to produce complex shortcuts

These options make it useful for productivity tweaks, gaming binds, or accessibility adjustments.

Applying changes

After you finish configuring keys and macros, you must restart Windows for the remapped assignments to take effect. Save your profile before rebooting to avoid losing your setup.

Strengths

• Free and open-source license
• Simple, uncluttered workflow for remapping
• Macro and custom-action support for automation

Areas that could be improved

• The visual design could feel more modern and polished
• Requiring a system restart may interrupt workflows for some users

Bottom line

If you want a straightforward, no-frills tool to reassign keys or create basic macros, KeyMapper delivers the essentials without complication. Try it out to see if its simplicity fits your needs.