Showglass

Showglass is a Quick Look extension for macOS that lets you preview 83 file types—including code.

Configurations, documents, data, compressed files, fonts, and multimedia—by selecting a file in Finder and pressing the spacebar. Showglass It integrates quick previewing into your daily file browsing workflow, allowing you to confirm file content before opening the corresponding application. It’s suitable for developers, data processing personnel, and users who frequently handle multiple file formats. Supported formats include Swift, Markdown, TSV, JSON, Notebook, ZIP, TrueType, glTF, QOI, Matroska, EPUB, and GPX. The table preview also displays column types and data distribution. The companion app provides examples of viewing by file family, searching by extension, and dragging and dropping files, and offers Finder icons for 15 file types. Basic functionality covers 30 types, including code, configurations, and Markdown; the Pro extension covers the remaining 53 types and five additional color themes. The Quick Look extension has no network access, and files always remain on the local machine; anonymous usage statistics can be turned off in settings, and consent is requested before sending crash reports. Software requirements: macOS 26 or later.