How to open a code or text file online
Three steps, a few seconds, no software.
Open your .SUO file
Drop it on the box, choose it from your device, or paste the text straight in.
View it instantly
Your .SUO 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 .SUO file?
Plain text that programs, servers and people write every day.
A SUO file is a binary cache that Visual Studio creates next to every .sln file to remember your open tabs, breakpoints, window layout, and active build configuration. Visual Studio opens it automatically; it is not a file you work with directly. It is safe to delete, and VS recreates it. Never commit it to source control. Visual Studio 2017 and later stores this data in the hidden .vs\ folder instead.
Programs that open .SUO files
| Full name | Visual Studio Solution User Options |
|---|---|
| Developer | Microsoft Corporation |
| First released | 1997 (Visual Studio 97 / Visual Studio 5.0) |
| Category | Text & Code |
| MIME type | application/octet-stream |
| Signature | D0 CF 11 E0 A1 B1 1A E1 OLE2 / Compound File Binary Format magic |
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Frequently asked questions
Is my .SUO 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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