Code Previewer

view local code files — right in your browser

free · fully offline · no data collected

Everything a code viewer should have

// and nothing it shouldn't · v1.13.1

highlight.py

Syntax highlighting for 25+ languages with VS Code-grade colors. Unknown files fall back to clean plain text.

folder/

Folder view — open a directory and browse it as a grid, with language badges, filter, sort, breadcrumbs and keyboard navigation.

compare.diff

Compare mode — side-by-side diff of any two files, additions green, removals red, per-pane word wrap.

preview.md

Markdown preview — split, preview-only or source-only, with syntax-highlighted code blocks and a draggable divider.

flow.mmd

Mermaid diagrams — .mmd files and mermaid blocks inside Markdown render as real diagrams, in your theme.

themes.json

4 themes — Light, One Dark, GitHub Light, Dracula. One click cycles, your pick persists.

search.rs

Search & folding — Ctrl+F with regex and match case, code folding, line numbers.

offline.lock

100% offline — zero network calls, zero telemetry. Your files never leave your machine.

// real screenshots, real files

file:///C:/samples/showcase.py

file:///C:/samples/ — folder view

compare: Showcase.java ↔ Showcase_v2.java

file:///C:/samples/diagrams.md

file:///C:/samples/flow.mmd

// one-time setup, then it just works

bash — install

$ install code-previewer # from Chrome or Edge

$ enable "Allow access to file URLs" # extension details — required

$ open file:///C:/projects/main.py # or a whole folder

✓ rendered. zero setup after that.

// privacy.diff

privacy.diff

+ everything runs locally in your browser

+ only stored setting: your theme preference

- analytics - telemetry - network requests - accounts