Can I search the log?
Yes. Search to jump to the lines you need.
File viewer
Log File Viewer
Paste logs or drag and drop a log file to inspect severity levels, timestamps, search matches, and filtered output locally in your browser.
Runs Locally
This tool runs in your browser. Files never leave your device.
Drop a .log, .txt, .out, .err, .jsonl, or .ndjson file here.
Lines
7
Visible
7
Matches
0
Size
460 B
Timestamps
7
Severity breakdown
Filtered log viewer
Showing 7 of 7 lines.
1info2026-06-20 14:03:11 INFO server started on port 3000
2warn2026-06-20 14:03:18 WARN cache miss for key=user:1842
3error2026-06-20 14:04:02 ERROR failed to connect to database: timeout after 5000ms
4debug2026-06-20 14:04:09 DEBUG retrying database connection attempt=2
5info2026-06-20 14:04:11 INFO database connection restored
6fatal[2026-06-20T14:05:40.921Z] FATAL worker crashed pid=7784 code=1
7unknown127.0.0.1 - - [20/Jun/2026:14:06:04 -0400] "GET /tools/log-file-viewer HTTP/1.1" 200 4381
What this tool does
Log File Viewer opens a log file and gives you a fast, search-friendly way to read it in the browser. Jump to errors, find what matters, and scroll through long logs smoothly, instead of fighting a giant file in a basic text editor.
How it works
Open or drop a log file and the viewer loads it in your browser so you can read and search it. Find the lines you care about and move through long files quickly. Nothing is uploaded.
When to use Log File Viewer
Hunting for an error in a long server log
Reading an exported log on any machine
Searching a crash or debug dump
Skimming a log file without a special tool
FAQ
Does it handle big logs?
Yes. It is built to read long log files smoothly.
Are my files uploaded anywhere?
No. The file is read in your browser and never leaves your device.