How to open a code or text file online
Three steps, a few seconds, no software.
Open your .CNF file
Drop it on the box, choose it from your device, or paste the text straight in.
View it instantly
Your .CNF 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 .CNF file?
Plain text that programs, servers and people write every day.
A .cnf file is almost always a MySQL or MariaDB configuration file named my.cnf. It sets server and client options such as port, data directory, and buffer sizes. Open and edit it in a plain-text editor like Notepad++ or VS Code, and always back it up before making changes, because a typo can stop the MySQL service from starting.
Programs that open .CNF files
| Full name | MySQL Configuration File |
|---|---|
| Developer | Oracle (MySQL) / MariaDB Foundation |
| First released | MySQL option files, mid-1990s (my.cnf on Unix; my.ini on Windows) |
| Category | Text & Code |
| MIME type | text/plain |
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Frequently asked questions
Is my .CNF 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.
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