OnePreview

Quick Look extension for developers and file-heavy workflows

Preview Markdown, code, data and ZIP archives before opening an editor.

OnePreview keeps file inspection inside Finder, Files and the system preview flow. Render documentation, inspect structured data, browse archives and check source files with one press of Spacebar.

Download on the App Store Download Mac DMG Read setup help
README.mddata.jsonlarchive.zip
# Release Notes

```mermaid
flowchart LR
  Finder --> QuickLook
  QuickLook --> OnePreview
  OnePreview --> Rendered[Rendered Preview]
```

| Format | View |
| --- | --- |
| JSONL | Records |
| ZIP | Contents |
| SQLite | Tables |

One extension for the files you inspect every day

Markdown and docs

GitHub-flavored Markdown, tables, code blocks, math, Mermaid diagrams, alerts, plain text, logs, and documentation files.

Structured data

JSON, JSONL, YAML, XML, CSV, TSV, TOML, ENV, Apple property lists, and other text-based data formats.

Source code

Swift, Python, JavaScript, TypeScript, C, C++, Objective-C, Rust, Go, Ruby, Java, shell scripts, Assembly, and more.

Archives and folders

ZIP archive contents, folder listings, file sizes, modification dates, and SQLite database overviews.

Technical formats: Markdown, JSON, JSONL, YAML, XML, CSV, TSV, TOML, ENV, SQLite, Swift, Python, JavaScript, TypeScript, C, C++, Objective-C, Rust, Go, Ruby, Java, Shell, Assembly, source code, plain text, logs, folders, ZIP archives, Apple property lists (plist).

Designed for real Quick Look workflows

Stay in Finder

Press Spacebar on macOS to inspect supported files without launching a full editor.

Works on iPhone and iPad

Use the Files app or any app that opens system Quick Look previews.

Rendered and source views

Switch between readable rendered output and raw source when that makes inspection faster.

Read setup help

Setup and file preview guides