Log Viewer: Open Log Files

Log Viewer opens log files on your phone and shows you the part that matters. Every line gets a color bar for its level, so a block of errors stands out in red before you read a word.

It is made for the moment a server log, an app log or a crash dump arrives by email or chat and you need the error now, not when you are back at a computer.

OPENS BIG FILES FAST
Logs of hundreds of thousands of lines open in about a second. Only the lines on screen are drawn, so scrolling stays smooth.

FILTER BY LEVEL
Fatal, Error, Warn, Info, Debug and Verbose, each with a count. Tap Error to see only errors. Tap Warn as well to add warnings. Stack traces stay with the error they belong to.

Works with common formats: log4j and logback style, Python logging, syslog style words, Android logcat (threadtime and brief), and bracket tags like [E] and [W].

SEARCH
• Find an order number, user ID, IP address or any word
• Turn on regex for patterns, or match case when it matters
• Matches are marked in yellow and only matching lines are shown

READ AND SHARE
• Tap a line to read it in full and copy it
• Show around it: clear the filter and jump to that line in context
• Wrap long lines or keep one line per row
• Jump to the start or the end
• Save or share just the lines you filtered, as a .txt file
• Open with from Files, Gmail, WhatsApp or Drive

PRO
One payment adds highlight words, up to five words of your own marked in their own colors on every log, and removes ads. Everything else is free with no limits.

Files are read on your phone and never uploaded.