CUTL MBD Studio
Free online STEP viewer
Open STEP and STP files in your browser: full 3D assemblies, section and explode, and the PMI embedded in AP242 files. No install and no account.
STEP viewer Free, no account
Open full 3D STEP assemblies in the browser
CUTL opens full 3D STEP models right in the browser. Rotate, zoom, section and explode the assembly, and read everything the file already carries: no CAD seats, no exported screenshots, no converting to a neutral format first.
Full assemblies, not just parts
Open multi-body STEP assemblies: browse the component tree, isolate, hide and explode parts to inspect how it all fits.
PMI & metadata
Reads embedded dimensions, tolerances, surface finish and datums (PMI) straight from the STEP file, nothing lost in translation.
Production drawing PDF in one click
Turn the model into a drawing: an overview with numbered balloons, a parts list and one page per unique part. Free.
Material and weight
Set a material or a density and see the mass of the whole model and of each part, worked out from its volume.
Collaboration Available after registration
You and your client discuss the part together
Invite your customer in to look at the same part with you. Pin comments, talk through the assembly live and agree on it in one place, with no endless email threads. When everyone agrees, push it straight to quoting.
Share the model, not the file
Your client sees and discusses the 3D model in the viewer. The STEP file itself is never sent or downloadable.
Invite clients in one click
Share a link: your customer opens the same 3D model in their browser. No CAD, no installs, no account hoops.
Discuss right on the model
Drop pins and comments on any face or edge. Talk through the assembly together, in real time, on the part itself.
Live shared view
Everyone sees the same model as you rotate, zoom and section it, like working around one table, online.
From discussion to quote
Once the part is agreed, send it straight to quoting: no re-drawing, no re-uploading.
Show only what they need
Hide assembly parts from one invitee, save the selection as a template and preview the model as they will see it.
STEP viewer questions
Yes. Opening and viewing STEP and STP files is free and needs no account. A free account adds keeping files, share links for clients, comments pinned on the model and version history.
No. The viewer runs in the browser on desktop and mobile. There is no CAD seat, plugin or download.
STEP files with the .step or .stp extension, from single parts to multi-body assemblies with a component tree.
Yes. The viewer reads the dimensions, tolerances, surface finishes and datums embedded in AP242 STEP files.
Without an account nothing is stored. With an account your files are kept, and when you invite a client they see the 3D model in the viewer; the STEP file itself is never sent or downloadable. Hosting is in the EU.
Open your first STEP model in the browser
Looking at a file needs no account. Create a free one when you want to keep it, share it with a client or use the other tools.