Edit STL files online in your browser, no install.
ForgeSlicer is a browser-based STL editor. Drop in any .stl, .obj or .3mf file, resize, cut holes, add text, fix orientation, and export back to STL or 3MF in seconds — no Blender, no Fusion 360 download.
STL, OBJ and 3MF files land on the build plate ready to manipulate — nothing uploads to a server unless you choose to share it.
Add primitives (cubes, cylinders, spheres, text) as Negatives and subtract — the standard way to drill, slot, or engrave any imported STL.
Hit the mic, say “add a 5 mm hole through the middle”, and watch ForgeSlicer modify the imported mesh in real time.
Watertight mesh repair runs on export (pymeshfix). Multi-part 3MF preserves your positives, negatives and group hierarchy for the next slicer.
- 1Drag your STL in
Drop the file on the workspace; ForgeSlicer parses it locally in your tab.
- 2Edit
Resize, rotate, add or subtract primitives, change orientation, add embossed text.
- 3Export
Save STL for archival or 3MF for OrcaSlicer / Bambu Studio / PrusaSlicer.
The workspace is free, runs in your browser, and ships with 12 beginner starter templates so you don't face a blank canvas.