Resolution Mapper

Resolution Mapper is a small macOS utility for changing, overriding, and mapping external monitor resolution through a virtual display. It was built for stubborn Full HD monitors that feel too large in macOS, but it can be used with any detected external display.

It creates a virtual display, mirrors a selected monitor to it, and stores profiles per monitor using vendor, model, and serial identifiers.

Use it when macOS does not offer the resolution you want in Display Settings, when an external monitor needs more workspace than its native mode exposes, or when you want a free macOS custom resolution mapper without relying on BetterDisplay.

Keywords people usually search for: macOS resolution override, Mac resolution changer, external monitor custom resolution, virtual display resolution, HiDPI display mapper, QHD on Full HD monitor, change Mac monitor resolution, force display resolution on macOS.

Features

• Create virtual displays with custom resolutions
• Map any connected external monitor to a selected virtual resolution
• Store resolution profiles per monitor identity
• Use a stable virtual display identity per physical monitor
• Restore saved display arrangement origin after reconnect
• Remove virtual displays automatically when the physical monitor is disconnected
• Restore the saved mapping when the monitor is connected again
• Optional launch-at-login restoration
• Presets for QHD, soft QHD, wide workbench, 4K downsample, and native FHD

Download

Get the latest universal macOS installer from the Releases page.

Support

Created by corekill.

Notes

Resolution Mapper uses macOS virtual display APIs. These APIs are not part of a stable public app distribution contract, so behavior may change after macOS updates.

Text smoothing is limited by macOS downscaling and the physical panel. Try less aggressive presets such as Soft QHD when text looks jagged.

Build

swift build --configuration debug --product ResolutionMapper

To create a local universal app bundle and DMG installer:

CONFIG=debug scripts/build-release.sh
open "dist/Resolution Mapper.app"
open "dist/ResolutionMapper-v1.1-macos-universal.dmg"

Attribution

The VirtualDisplayBridge target is derived from SimpleDisplay, which is licensed under GPLv3.

License

GPLv3. See LICENSE.