How to open a code or text file online
Three steps, a few seconds, no software.
Open your .CONFIG file
Drop it on the box, choose it from your device, or paste the text straight in.
View it instantly
Your .CONFIG file opens neatly formatted with line numbers.
Search, copy or download
Search the text, jump to any line, then copy what you need or download a clean copy.
What is a .CONFIG file?
Plain text that programs, servers and people write every day.
A .config file is a settings file that tells a program how to behave. The most common kind is a Microsoft .NET configuration file (App.config or Web.config), which is plain XML you open in any code editor such as VS Code or Notepad++. Always back up the file before editing, because a typo can stop the application from starting.
Programs that open .CONFIG files
| Full name | Configuration File |
|---|---|
| Developer | N/A (generic extension; the dominant case is Microsoft .NET App.config / Web.config) |
| First released | No single origin; .NET App.config/Web.config since .NET Framework 1.0 (2002) |
| Category | Text & Code |
| MIME type | text/xml |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .CONFIG file uploaded anywhere?
No. The file is read and highlighted for you.
Why do some characters look wrong (é, ł)?
That usually means the file was saved in one encoding and opened in another. We detect UTF-8, UTF-16 and the Windows-1250/1252 code pages automatically and show which one was used.
Can it handle huge log files?
Yes, up to 50 MB. Only the lines on screen are drawn, so scrolling stays smooth. Syntax colours are switched off for files over 1.5 MB to keep things fast.
How do the log level filters work?
We find levels like ERROR, WARN, INFO and DEBUG on each line. Lines without a level, such as stack traces, stay with the entry above them, so filtering to errors keeps the full trace.
Can I edit the file?
This is a viewer. To change code, download it or copy it into your editor. Converting encodings and line endings is planned.
Was this tool helpful?
Your rating helps us decide which tools to improve next.