How to open a code or text file online
Three steps, a few seconds, no software.
Open your .HTML file
Drop it on the box, choose it from your device, or paste the text straight in.
View it instantly
Your .HTML 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 .HTML file?
Plain text that programs, servers and people write every day.
An HTML file is a web page, plain text with markup tags that a browser turns into the formatted page you see. To view it, double-click and it opens in your browser (Edge, Chrome, Firefox, Safari). To edit the code, open it in a text editor such as Notepad++ or VS Code. The .html and .htm extensions are the same format; only the spelling differs.
Programs that open .HTML files
| Full name | HyperText Markup Language Web Page |
|---|---|
| Developer | W3C / WHATWG (HTML standard); originated by Tim Berners-Lee, CERN |
| First released | 1991 (first HTML by Tim Berners-Lee); HTML5 from 2014 |
| Category | Text & Code |
| MIME type | text/html |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .HTML 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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