Every type, by extension.

Showglass is a Quick Look preview extension. These are the 83 types of files it previews in Finder on your Mac when you press Space, in 13 families.

Code & config

23 types, Free. Showglass also draws the Finder thumbnails of CSS, SCSS, Sass, Less, YAML, TOML, INI, conf, properties.

TypeExtensionsTier
Swift.swiftFree
Objective-C / Objective-C++.m .mmFree
C / C++.c .cc .cpp .cxx .h .hh .hppFree
C#.csFree
Java.javaFree
Kotlin.kt .ktsFree
Go.goFree
Rust.rsFree
Python.py .pyi .pywFree
Ruby.rb .rake .gemspecFree
JavaScript.js .mjs .cjsFree
JSX.jsxFree
TypeScript (.tsx, .cts).tsx .ctsFree
PHP.phpFree
Shell script.sh .bash .zsh .ksh .fish .commandFree
SQL.sqlFree
CSS, SCSS, Sass, Less.css .scss .sass .lessFree
YAML.yaml .ymlFree
TOML.tomlFree
INI, conf, properties.ini .cfg .conf .propertiesFree
Environment file.envFree
Build and tooling file.mk .make .dockerfile .cmake .gitignore .editorconfig .gitattributes .xcconfigFree
Protocol Buffers.protoFree

Markdown & docs

6 types, Free.

TypeExtensionsTier
Markdown.md .markdown .mdown .mkd .mkdnFree
MDX.mdxFree
R Markdown / Quarto.rmd .qmdFree
TextBundle / TextPack.textbundle .textpackFree
LaTeX source.tex .ltx .sty .clsFree
reStructuredText.rstFree

Data

8 types, Pro. Showglass also draws the Finder thumbnail of JSON Lines / NDJSON.

TypeExtensionsTier
Tab-separated values.tsv .tabPro
JSON.jsonPro
JSON Lines / NDJSON.ndjson .jsonlPro
JSON5 / JSONC.json5 .jsoncFree
XML.xmlPro
Property list.plistPro
SQLite database.sqlite .sqlite3 .db .db3Pro
Parquet.parquetPro

Notebooks

1 type, Pro.

TypeExtensionsTier
Jupyter notebook.ipynbPro

Archives

10 types, Pro. Showglass also draws the Finder thumbnails of ZIP archive, TAR archive, gzip archive, bzip2 archive, xz archive, 7-Zip archive, Java archive, iOS app archive.

TypeExtensionsTier
ZIP archive.zipPro
TAR archive.tarPro
gzip archive.gz .tgzPro
bzip2 archive.bz2 .tbz2Pro
xz archive.xz .txzPro
7-Zip archive.7zPro
RAR archive.rarPro
Java archive.jar .warPro
Android package.apk .aabPro
iOS app archive.ipaPro

Fonts

5 types, Pro.

TypeExtensionsTier
TrueType font.ttfPro
OpenType font.otfPro
Font collection.ttc .otcPro
WOFF font.woffPro
WOFF2 font.woff2Pro

3D

4 types, Pro.

TypeExtensionsTier
glTF.gltfPro
glTF binary.glbPro
FBX.fbxPro
3MF.3mfPro

Developer artifacts

11 types, Pro. Showglass also draws the Finder thumbnail of Strings / stringsdict.

TypeExtensionsTier
Entitlements.entitlementsPro
String Catalog.xcstringsPro
Strings / stringsdict.strings .stringsdictPro
Log file.logPro
Crash report.crashPro
Diff / patch.diff .patchPro
HTTP archive (HAR).harPro
GGUF model weights.ggufPro
Safetensors.safetensorsPro
NumPy array.npy .npzPro
Application bundles.appPro

Images & design files

4 types, Pro.

TypeExtensionsTier
QOI image.qoiPro
Sketch document.sketchPro
Procreate artwork.procreatePro
Krita / OpenRaster.kra .oraPro

Media metadata

5 types, Pro. Showglass also draws the Finder thumbnail of WebVTT subtitles.

TypeExtensionsTier
Matroska.mkv .mka .mk3dPro
WebM.webmPro
SubRip subtitles.srtPro
WebVTT subtitles.vttPro
ASS / SSA subtitles.ass .ssaPro

Books & comics

2 types, Pro.

TypeExtensionsTier
EPUB.epubPro
Comic archive.cbz .cbtPro

Geo

3 types, Pro.

TypeExtensionsTier
GPX.gpxPro
KML / KMZ.kml .kmzPro
GeoJSON.geojsonPro

Folders

1 type, Pro.

TypeExtensionsTier
FolderfoldersPro

What macOS keeps

PDF, Office and iWork files, images, audio and video, HTML, CSV and a few others stay with the previews macOS draws itself. The support page lists them, and the home page answers for any extension: Can Showglass open it?

83 file types, one key.

Free for code, config and Markdown: 30 types. Pro adds the other 53 types and five more color themes.

Pro US$9.99 + VAT, one-time

  • 14-day free trial
  • 2 Macs per key
  • macOS 26 or later
Download freeBuy a license

Also on the Mac App Store (US$9.99, local price there).