Do my files get uploaded?

No. Everything runs in your browser. The file never leaves your computer, so it works for client files and unreleased designs too.

Will it show the colours I painted?

Base colours set on objects show up. Slicer paint (per-face colour) and print settings don't, since those live in slicer-specific extras.

All tools / 3MF viewer

3MF viewer

Have a peek inside a 3MF without starting your slicer. Works with files from MakerWorld, Printables, Bambu Studio and PrusaSlicer.

Good to know

Guide3MF vs STL: which one should you use?Use 3MF when you can, and STL when something only takes STL.

Opening a 3MF elsewhere

Slicers: Bambu Studio, PrusaSlicer, OrcaSlicer and Cura all open 3MF, with the settings if the file has them.
Blender: needs a 3MF add-on, or convert to STL first with our 3MF to STL tool.
Tools that only take STL: use 3MF to STL. You keep the shape and lose the colours and settings.

About 3MF files

3MF is a zipped file that holds the shape plus extras: the unit, several parts, colours, and often the slicer's settings. MakerWorld projects are 3MF, and many Printables downloads are too.

This viewer shows the shapes and their base colours. Slicer extras like painted faces and plate settings only show up in the slicer that made them.

How it works

1Drop a 3MF file in the box.
2Drag to spin it. Scroll or pinch to zoom. Right-drag to pan.
3Read the size, triangle count and whether it's watertight in the panel.

Questions people ask

Checked October 2026

Do my files get uploaded?: No. Everything runs in your browser. The file never leaves your computer, so it works for client files and unreleased designs too.
Will it show the colours I painted?: Base colours set on objects show up. Slicer paint (per-face colour) and print settings don't, since those live in slicer-specific extras.

Other tools you might need

STLPalConverter

3MF→STL

Free · in your browser · no upload

3MF to STLGot a 3MF from MakerWorld or Printables but your tool wants STL? Drop it here and get an STL back at the right size

STLPalConverter

STL→3MF

Free · in your browser · no upload

STL to 3MFTurn one STL, or a whole set of them, into a single 3MF

STLPalViewer

.STL

Free · in your browser · no upload

STL viewerOpen any STL to look it over before you print

STLPalTool

Edit

Free · in your browser · no upload

STL editorResize, rotate, mirror and combine STL files right here