Static + Browser-Only
Compare logs online instantly. This free log diff tool helps you compare two log files, stack traces, and debugging outputs while highlighting added errors, removed warnings, and changed log lines in your browser.
Use this log compare viewer when yesterday's log and today's log no longer match, when a new error appears after deployment, or when you need a log diff tool online before sharing snippets externally.
Original
Updated
What Is It
A log diff tool compares two log files and shows exactly which lines changed between them. It works as a free online log compare viewer for errors, warnings, stack traces, and mixed debugging output.
Use Cases
Features
FAQ
Paste both log versions into the original and updated panels, or drag and drop log files into each side. Then compare them to review the changed lines and errors.
A good log diff tool should compare logs online clearly, highlight changed lines fast, and keep debugging text local. This page is built as a free browser-based log compare viewer.
Use it when application logs, stack traces, or support logs changed and you need to identify the exact difference before debugging, documenting, or sharing excerpts.
Manual log review wastes time because the important difference is often buried inside familiar lines. A log diff viewer gives you a faster way to compare logs online and isolate new errors, removed warnings, or changed stack trace output.
This is useful for engineering, operations, QA, and support teams that need to review changed logs before sharing evidence, escalating incidents, or documenting regressions.
Examples
These sample logs show removed warnings, changed outcomes, and newly added timeout lines.
[INFO] Request started [INFO] Request id=req_204 [WARN] Retry scheduled [INFO] Request completed [INFO] Archived response payload
[INFO] Request started [INFO] Request id=req_204 [ERROR] Timeout while calling vendor [INFO] Request failed [INFO] Escalated to on-call