About Log Voyager
Inspect log files without giving them away
Log Voyager is a free online log file analyzer for developers, operators and system administrators. It opens text, JSON and compressed logs in the browser, keeps the selected file on your device and gives you a focused path from raw output to useful evidence.
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Log analysis should start close to the file
When a service fails, the first question is usually what happened around a timestamp, request ID or error. Log Voyager shortens that investigation loop: open the file you already have, search it, reduce the noise and keep the relevant lines.
The browser reads the file you choose and the application performs its work on your device. The public source code makes that privacy boundary easier to inspect.
A practical viewer for messy incident files
Chunked file reading
The viewer reads small slices around the current position rather than building one large document before showing useful lines.
Search that keeps context
Use plain text, case-sensitive matching, regular expressions and combined filters while leaving the source file unchanged.
JSON, JSONL and compressed logs
Inspect structured application output alongside ordinary text and supported GZIP-compressed log files.
Evidence you can hand off
Bookmark important lines and export a smaller TXT, JSON or CSV working set for a ticket or postmortem.
Who uses a local log viewer?
Backend developers can trace exceptions and request IDs. DevOps and SRE teams can review container, proxy and deployment logs. Security investigators can narrow access and system events locally. Administrators can inspect Nginx, Apache and syslog exports from the workstation already in use.
Open source and independently maintained
Log Voyager is released under the MIT license. There is no paid tier or account wall. Optional Ko-fi support helps cover hosting, browser testing and ongoing maintenance.
Questions about Log Voyager
Are files uploaded to a server?
No. Selected files are processed locally in the browser.
Can it open large log files?
The viewer avoids loading an entire file as one document, but practical limits still depend on the browser, device, compression and file structure.
Do I need an account?
No. The analyzer is available without registration or a subscription.