Microsoft Error Lookup Tool explains hexadecimal error codes, with usage instructions provided in Microsoft Learn.
ErrorLookup
Error Lookup retrieves explanations for Windows error codes through a portable open-source tool.
About ErrorLookup
Error Lookup is a Windows application that translates error codes into text descriptions. Its window has one field for entering a code and another for showing the result. It is offered as an installer or a portable build.
Pricing is not clearly stated.
Key features
- Looks up regular Windows API error codes
- Looks up Native API error codes
- Looks up DirectX error codes
- Looks up Windows Internet error codes
- Looks up STOP codes
- Activates portable mode with an errorlookup.ini file
Best for: People who need to translate Windows error codes into readable descriptions.
Good for
- Open source under GPL-3.0
- Application is less than a megabyte
Watch out for
- Requires Windows 7 or later on 64-bit or ARM64
- Requires an SSE2-capable CPU
- Windows 7 needs the KB2533623 and KB3063858 updates
ErrorLookup at a glance
- Category
- Software & Utilities › System Utilities
- Type
- App
- Pricing
- Not confirmed. Check the site
- Platforms
- Windows
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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