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Hammer++

C
C tier on Game Level EditorsScore 6.8 · #9 of 27
Android app
Not listed
Free plan
Yes
Runs on
Windows
ficool2.github.io
The Hammer++ homepage
Visit site Alternatives

Summary

Hammer++ is a free Windows modification of Valve’s Hammer editor for building maps in the Source engine. Its stated aim is to make the editor more stable and current through fixes and improvements. It can simulate Source lighting within the editor, with adjustable quality and speed and dynamic updates, and preview particles, fog, skyboxes, rope physics, render effects, and material proxies. Mapping tools include a 3D gizmo, polygon and sprinkle tools, multiple cordons, brush merging, and placing objects on floors or ceilings. If the editor crashes, it shows a detailed error and autosaves open VMF files. Saved VMFs retain precise vertex data while also including less precise data for compilers and compatibility with other Hammer versions. Downloads bundle HLMV++, which users may optionally install. The maker directs users to its official Discord for discussion and says the project is not affiliated with Valve. The download page lists build 8871, last updated April 14, 2026. The maker also notes antivirus software may flag downloads and advises allowing them or adding an exception.

Who it is for

Hammer++ suits Windows users who create Source engine maps and want editor-based lighting and visual previews alongside mapping tools. It is not suited to users relying on the old Source 2013 Multiplayer version; CS:GO support is frozen on build 8864.

What is good

  • Simulates Source lighting with adjustable quality and speed.
  • Previews particles, fog, skyboxes, and render effects.
  • Autosaves open VMF files after a crash.
  • Provides tools for polygon work, brush merging, and placement.
  • Download includes optional HLMV++.

What to know first

  • Available for Windows only.
  • The old Source 2013 Multiplayer version is unsupported.
  • CS:GO support is frozen on build 8864.
  • Antivirus software sometimes flags downloads.

Verdict

Hammer++ offers Source-focused previews and mapping tools, with crash recovery that autosaves open VMFs. Check the stated game-version limits and be aware the maker reports occasional antivirus flags.

Hammer++ plans and pricing

All plans
Hammer++ Free Free modification of Valve’s Hammer editor for the Source engine ficool2.github.io · 28 Sept 2026

Compared on game level editors

Free plan
Yesficool2.github.io
Level dimensions
3dficool2.github.io
Tilemap tools
Noficool2.github.io
Terrain tools
Yesficool2.github.io
Entity placement
Yesficool2.github.io
Prefab or template tools
Yesficool2.github.io
Visual scripting
Noficool2.github.io

Facts

Purpose
Hammer++ is a free modification of Valve’s Hammer editor for the Source engine, intended to be more stable and up to date, with bug fixes and improvements.ficool2.github.io · 28 Sept 2026
Lighting preview
It can simulate Source lighting inside the editor with configurable quality and speed and dynamic updates.ficool2.github.io · 28 Sept 2026
Visual previews
The editor can preview particles, fog, skyboxes, rope physics, render effects and material proxies.ficool2.github.io · 28 Sept 2026
Mapping tools
Features include a 3D gizmo, polygon and sprinkle tools, multiple cordons, brush merging and object placement on floors or ceilings.ficool2.github.io · 28 Sept 2026
Crash recovery
If Hammer++ crashes, it displays a detailed error message and autosaves open VMF files.ficool2.github.io · 28 Sept 2026
File compatibility
Hammer++ saves precise vertex data in VMF files while also saving imprecise data for compilers and compatibility with other Hammer versions.ficool2.github.io · 28 Sept 2026
Keybind limits
The keybind editor cannot assign mouse bindings, and modifier keys may not work for every binding.ficool2.github.io · 28 Sept 2026
Integrations
The download page says HLMV++ is bundled with downloads and can be optionally installed.ficool2.github.io · 28 Sept 2026
Support
The maker directs users to the official Discord to discuss Hammer++.ficool2.github.io · 28 Sept 2026
Download status
The download page lists build 8871, last updated April 14, 2026.ficool2.github.io · 28 Sept 2026
Antivirus issue
The maker says downloads are sometimes marked as malware by antivirus software and advises allowing them or adding an exception.ficool2.github.io · 28 Sept 2026
Compatibility limits
The page says the old Source 2013 Multiplayer version is unsupported and CS:GO support is frozen on build 8864.ficool2.github.io · 28 Sept 2026
Maker affiliation
The site says Hammer++ is not affiliated with Valve Corporation.ficool2.github.io · 28 Sept 2026

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