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Grep-style filtering for logs — keyword, level, or regex.
🔒 Filtering runs entirely client-side — paste production logs without fear. Level match is word-boundary exact (WARN matches WARN, not WARNING).
Logs contain tokens, user identifiers, stack traces with internal paths. Pasting them into random web tools leaks production detail; this filter parses everything in your browser and never uploads a byte.
Level matching is word-boundary exact: WARN matches WARN lines but not WARNING, so mixed-format logs stay predictable. Leave it on "All levels" and rely on include/exclude patterns when formats vary.
Enable regex mode for alternation like error|timeout|refused. Keep patterns simple — catastrophic backtracking patterns freeze the same here as anywhere; stick to literal alternations over nested quantifiers.
The Log Filter & Grep Tool handles log filterdirectly in your browser. Paste or type your input, and the tool processes it instantly — no upload, no signup, no waiting. It's built for the moments when you need a quick transformation and don't want to leave your workflow.
Because the tool runs client-side, it's fast and private. Your text never touches a server, which makes it safe for sensitive content. The interface is keyboard-friendly and works on any device with a modern browser.
Common uses: people reach for this tool when they need to use a search through large log file online, filter error lines from logs, client side log analysis tool, or exclude debug lines grep invert.
Browser-based tools like this one have a few real advantages over installed software or manual methods:
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