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Log Slice

Open multi-gigabyte log files instantly and find the lines that matter.

Windows & macOS v1.0.0 1 year of updates
One-time purchase
$59
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Log Slice filtering a 12.9-million-line access log with stacked include/exclude filters in 213 ms
Log Slice filtering a 12.9-million-line access log with stacked include/exclude filters in 213 msA 1.2 GB, 12.9-million-line log open with line-by-line scrollingExtracting one hour of log lines to a new file with the time-range slicerLive tail following new matching lines with filters applied

What it does

Instant open

Streams multi-gigabyte files without loading them into memory — a 20 GB log opens as fast as a 20 MB one.

Time-range slicing

Pull out just last night's incident window and save it as its own file.

Stackable filters

Layer include and exclude filters, plain text or regex, without re-reading the file.

Format aware

Understands IIS, Apache, nginx, syslog and JSON-lines formats out of the box.

Live tail mode

Follow a growing log in real time with your filters still applied.

Offline & private

Your logs stay exactly where they are. Nothing is indexed or uploaded.

System requirements

  • Windows 10 / 11 or macOS 12+
  • 4 GB RAM minimum (8 GB recommended for very large files)
  • 100 MB free disk space
One-time purchase
$59 once, yours forever
  • ✓  Full version, no feature limits
  • ✓  One year of free updates
  • ✓  Use on your work & home machine
  • ✓  Friendly email support
Buy Log Slice

Questions, answered

Is there a file size limit?
No practical one. Files are streamed rather than loaded, so even tens of gigabytes stay responsive.
Does it index or upload my logs?
No. Log Slice reads your files in place and never sends anything anywhere.
Is this a one-time purchase?
Yes — one payment, yours forever, with a year of free updates.
Can it watch a log that's still being written?
Yes — live tail mode follows growing files in real time, filters included.