ANSI Logs

High-performance ANSI log viewer for VS Code — beautifully renders colored log files, handles 2M+ line files without breaking a sweat.

Features

ANSI color rendering — full support for 4-bit (16 colors), 256-color, and RGB truecolor escape codes. Bold, italic, dim, underline, strikethrough, blink, inverse.
Virtual scrolling — only renders the visible rows. Opens a 62 MB / 310k-line log file instantly; scales to 2M+ lines.
Log-level filter buttons — one-click filter by FATAL / ERROR / WARN / INFO / DEBUG / TRACE.
Grep / contains filter — type in the filter bar to show only lines matching a substring (case-insensitive). Runs asynchronously so the UI stays responsive.
Inline editing — double-click any row to edit the raw log text inline. Press Enter to save, Escape to cancel. The file is updated surgically (single-line byte replace) without a full re-read.
Search — Ctrl+F opens search; F3 / Shift+F3 navigate results; search results are highlighted.
Tail-follow — click ⬇ Tail to auto-scroll to the bottom as the log grows.
Edit Raw — open the file in VS Code's native text editor any time via the toolbar button.
Dynamic gutter — line number column width adapts to the number of digits, so there's no layout shift between 1-line and 2M-line files.

Open any .log file — ANSI Logs activates automatically as the default viewer.

Action	How
Filter by log level	Click FATAL / ERROR / WARN / INFO / DEBUG / TRACE buttons
Grep lines	Type in the Filter lines bar
Search text	Ctrl+F, then F3 / Shift+F3 to navigate
Edit a line	Double-click the row, type, press Enter
Copy line	Single-click the row
Follow tail	Click ⬇ Tail
Open as raw text	Click ✏ Edit Raw

Setting	Default	Description
`ansiLogs.lineHeight`	`22`	Row height in pixels
`ansiLogs.fontSize`	`13`	Font size in pixels
`ansiLogs.fontFamily`	`""`	Font family (empty = VS Code editor font)
`ansiLogs.renderBuffer`	`100`	Extra rows rendered outside visible area

ANSI Logs uses a streaming file scanner that builds a byte-offset index without loading the entire file into memory:

VS Code 1.74.0 or newer.

MIT