How to open a code or text file online
Three steps, a few seconds, no software.
Open your .CPP file
Drop it on the box, choose it from your device, or paste the text straight in.
View it instantly
Your .CPP 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 .CPP file?
Plain text that programs, servers and people write every day.
A CPP file is plain-text C++ source code, the human-written instructions that a compiler turns into a runnable program. Open it in any code editor (VS Code, Notepad++, Xcode) to read or edit the code. To run it, compile it first with GCC, Clang, or MSVC: the file does nothing on its own.
Programs that open .CPP files
| Full name | C++ Source Code File |
|---|---|
| Developer | Bjarne Stroustrup / Bell Labs (C++ language); standardized by ISO/IEC |
| First released | C++ language created 1979-1985 (Bjarne Stroustrup, Bell Labs); first ISO standard C++98 (1998) |
| Category | Text & Code |
| MIME type | text/x-c++src |
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Frequently asked questions
Is my .CPP 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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