Free Online 3D Slicer — STL to G-Code in Your Browser

Slice STL, 3MF, and OBJ models into G-code right in your browser: Kiri:Moto, the mature open-source slicer by Grid.Space, running fully on your device with built-in printer profiles, toolpath preview, and support generation. No install, no account, and your models never leave your device.

Kiri:Moto

Slice STL and 3MF models into G-code right in your browser — an OrcaSlicer-class slicer with no install.

Slice STL/3MF/OBJ to G-code fully in your browserDozens of built-in FDM printer profiles (Marlin, Klipper, and more)Layer-by-layer toolpath preview and support generationCNC milling and laser cutting modes as well

Loads the official app — nothing is uploaded, and your files stay on this device.

This is a desktop-class app — it works best on a larger screen.

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Quick Answer

This free online 3D slicer is Kiri:Moto — the open-source slicer by Grid.Space, in development for over a decade and embedded by sites like Onshape and Thingiverse — running fully in your browser. It turns STL, 3MF, and OBJ models into G-code entirely on your device: pick your printer from dozens of built-in profiles (Marlin, Klipper, Bambu Lab, Prusa, Anycubic and more), arrange and orient the model, preview the toolpaths layer by layer, and export the G-code to your computer or send it straight to your printer. No desktop slicer — not OrcaSlicer, PrusaSlicer, or Cura — runs in a browser, so a browser-native slicer like this is the way to slice without installing anything. Nothing is uploaded: models and G-code stay on your device, and it costs nothing with no account.

How It Works

1

Click Launch — the slicer loads in the page and asks which machine you use (or pick one from the built-in profiles)

2

Import your STL, 3MF, or OBJ file and arrange, rotate, or scale it on the bed

3

Press Slice, then scrub the layer preview to check walls, infill, and supports

4

Export the G-code to your device — or connect directly to a printer over the network

Key Facts

  • Kiri:Moto — the mature browser-native slicer (MIT, 13+ years of development)
  • Slice STL, 3MF, and OBJ to G-code entirely on your device
  • Dozens of built-in FDM printer profiles — Marlin, Klipper, Bambu, Prusa, and more
  • Layer-by-layer toolpath preview and support generation
  • CNC milling and laser-cutting modes as well as FDM
  • Free, open source, no account, nothing uploaded

Frequently Asked Questions

Can OrcaSlicer or PrusaSlicer run in a browser?

No — and this page is the honest alternative. OrcaSlicer, PrusaSlicer, Cura, and the other popular slicers are large desktop applications built on desktop GUI frameworks, and none of them has a WebAssembly build; the "OrcaSlicer in your browser" services that exist stream a cloud desktop and require an account. Kiri:Moto was built browser-native from the start: it is a real, mature slicer (MIT-licensed, in development since 2013, also embedded inside Onshape and Thingiverse) that generates G-code in your tab without any server round-trip.

What file types can it slice, and what does it export?

It imports the standard model formats — STL, 3MF, and OBJ among them — and exports G-code for FDM printers. The same app also has CNC milling and laser-cutting modes that generate the appropriate toolpaths for those machines. Files load from your device and the sliced output saves back to your device; nothing passes through a server.

Does it support my 3D printer?

Very likely. Kiri:Moto ships with dozens of built-in machine profiles — generic Marlin and Klipper configurations plus named profiles for common brands like Bambu Lab, Prusa, Anycubic, Creality-class beds, and more — and you can fine-tune nozzle, bed size, speeds, and all the usual slicer settings. You can also save your own custom profile.

Is it really free, and are my models uploaded anywhere?

Yes and no. Kiri:Moto is MIT-licensed open-source software, embedded here from its official deployment, with no account, trial, or watermark. The slicer runs entirely in your browser — models are read locally and G-code is written locally. You can even keep working after disconnecting from the internet once it has loaded.

How does it compare to a desktop slicer like OrcaSlicer?

A desktop slicer still leads for heavy daily production — OrcaSlicer and PrusaSlicer have deeper printer-specific tuning and faster native slicing. Kiri:Moto covers everything most prints need — walls, infill, supports, brims, layer preview — with the unique advantage of running anywhere with no install: school Chromebooks, locked-down work machines, or quick re-slices on the go. For designing the model first, the Blender and FreeCAD editors on this site pair well with it.

Who makes Kiri:Moto?

Kiri:Moto is made by Stewart Allen at Grid.Space and has been in active development for over thirteen years. It is open source under the MIT license, and its slicing engine is also embedded in products like Onshape and Thingiverse. This page embeds the official deployment unmodified.