Log viewer
To open a Log file, drop it in the box below. It opens straight away, even with no extension or the wrong one. Your browser opens it on your device: nothing is uploaded.
What you see
| Log in the viewer | |
|---|---|
| Levels | Error and fatal, warning, info, debug and trace |
| Kinds | Syslog, access logs, JSON lines, logcat, plain |
| Large files | The first 2 MB at once, then Show all |
| Wrap | Long lines wrap with the switch |
| Extensions | .log, .syslog, .out, .err |
| Upload | None: opened on your device |
What is a Log file?
A log is a text file a program writes as it runs, a line per event, often with a time and a level such as ERROR or WARN.
The text with line numbers, each line coloured by its level: errors, warnings, info and debug. Syslog (by its priority), Apache and nginx access logs (by status), JSON lines (by "level") and Android logcat are recognised; other logs by the level word on each line. Stack traces take the level of the line above. The levels found are chips with counts: pick one or more to show only those lines.
How to open a Log file
- Add your Log. Drop the file in the box, choose it or paste it.
- Look at it. The text with line numbers, each line coloured by its level: errors, warnings, info and debug. Syslog (by its priority), Apache and nginx access logs (by status), JSON lines (by "level") and Android logcat are recognised; other logs by the level word on each line. Stack traces take the level of the line above. The levels found are chips with counts: pick one or more to show only those lines.
- Take it further. Download any file from inside an archive, or open another file.
Questions
Open it here and choose the Errors chip above the text.
No. It is read in your browser.
No. The viewer runs in your browser and opens the file on your device. Nothing is sent anywhere.