Missing Preview

Missing Previews adds Quick Look previews and thumbnails for CAD, 3D printing, electronics, fabrication, and Markdown files that macOS does not show on its own.

Contact support

Get started

Preview a file in three steps

01

Install

Keep Missing Previews in your /Applications folder so Finder can load its extensions. Supports Apple Silicon Macs running macOS 13 or later.

02

Select a file

Choose one of the supported file types in Finder. The file can be on your Mac or in a mounted location.

03

Press Space

Press the Space bar to open Quick Look. Use the arrow keys to move between files.

Current coverage

Supported formats

3D CAD

STEP / STP

.step · .stp

Interactive turntable previews for CAD models.

2D drawing

DXF

.dxf

Pan and zoom vector drawings with layer colors.

3D models

glTF / GLB

.gltf · .glb

Interactive previews with material colors and embedded base-color textures.

3D printing

3MF

.3mf

Interactive manufacturing models; sliced plates show as toolpaths.

Toolpaths

G-code

.gcode · .gco · .gcode.gz · .ufp

3D printer toolpaths colored by feature.

Print files

Binary G-code

.bgcode

Embedded preview image and print details.

Documents

Markdown

.md · .markdown

Rendered previews with selectable Markdown flavor and Mermaid diagrams.

Electronics

KiCad

.kicad_pcb · .kicad_sch

Zoomable board layouts and schematics.

Fabrication

Gerber & drill

.gbr · .gtl/.gbl/… · .drl · .xln

PCB fabrication layers and drill files.

Troubleshooting

If Quick Look is blank

Confirm the file extension is supported, then close and reopen Quick Look. If you recently installed or updated the app, relaunch Finder and try again.

External-buffer or external-texture .gltf assets are not supported in the Quick Look sandbox; use a self-contained .glb. Embedded base-color textures are supported, while advanced material textures, skins, and animations are unsupported. DXF text, dimensions, and hatch fills are not drawn.

Markdown previews render documents but do not provide Finder thumbnails. Some macOS versions may not show a glTF Finder thumbnail even when the Space-bar preview is available. Binary G-code with decoded motion renders a 3D toolpath; files without usable motion fall back to an embedded preview image and print details.

Please include the file extension, macOS version, and what you expected to see when contacting us. Avoid sending confidential design files unless we ask for one.

Email contact@bearinglabs.io →