Convert Rhino 8 to Rhino 7
Rhino 7 can't open .3dm files saved in Rhino 8 — the file format isn't forward-compatible, even one version back. RhinoFileConverter rewrites your file with the official OpenNURBS write pipeline (archive v80 → v70) so it opens natively in Rhino 7, with NURBS geometry, layers and blocks preserved.
Files will be converted to Rhino 7 (if compatible).
Why convert Rhino 8 files to Rhino 7?
You're modeling in Rhino 8 but need to hand the file to someone on Rhino 7 — a client, subcontractor, university lab, or team member who hasn't upgraded. Rhino 7 is still used by the largest install base — most architecture and product studios today, and Rhino 8 is used by power users, teams on the latest McNeel release, studios doing generative or SubD-heavy work. Rather than asking them to upgrade or waiting for a re-export, convert the file here and send them a Rhino 7-native .3dm.
- Open Rhino 8 files in Rhino 7 without upgrading your license
- Official OpenNURBS 80 → 70 write pipeline
- NURBS surfaces, curves, meshes, layers and blocks preserved
- Runs in seconds, right in your browser — files stay private
- No plugins or software installation required
- Works on Windows, macOS and Linux
How it works
- 1
Upload your Rhino 8 .3dm file (drag & drop or browse)
- 2
We detect the file version instantly from the file header
- 3
Click Convert — the file is rewritten in Rhino 7 format using the official OpenNURBS libraries
- 4
The converted file downloads automatically
What actually changes between Rhino 8 and Rhino 7
Features introduced between Rhino 7 and Rhino 8 are downgraded to their closest Rhino 7 equivalent: PushPull history, ShrinkWrap solidification, Content Filler patterning, reworked annotation styles, Cycles material overhaul, and Grasshopper 2 preview objects.
The archive header is rewritten from OpenNURBS v80 (Rhino 8) to v70 (Rhino 7) so Rhino 7 recognises the file natively.
Because Rhino 7 is only one release behind Rhino 8, most objects survive without visible change. This is the cleanest possible downgrade.
Geometry preservation
NURBS surfaces, curves, meshes, layers, blocks and materials are preserved. PushPull history, ShrinkWrap solidification, Content Filler patterning, reworked annotation styles, Cycles material overhaul, and Grasshopper 2 preview objects are the ones that need translation: they get replaced with the closest Rhino 7-native representation (e.g. SubD → mesh or NURBS, newer annotations → base annotation types).
Tips for a clean Rhino 8 → Rhino 7 conversion
- Save a copy of the original Rhino 8 file before downgrading — some newer features can't be perfectly round-tripped back.
- If you're on Rhino 7 yourself and just want to hand the file to Rhino 7 colleagues, this is a one-click job.
Rhino 8 to Rhino 7 — FAQ
Can Rhino 7 open Rhino 8 files?
No. Rhino 7 uses OpenNURBS archive v70 and can't parse files saved with Rhino 8's newer v80 archive. Converting the file to the Rhino 7 format with RhinoFileConverter solves this in seconds.
What actually changes when I convert Rhino 8 to Rhino 7?
The archive version is rewritten from v80 to v70, and features that didn't exist yet in Rhino 7 — PushPull history, ShrinkWrap solidification, Content Filler patterning, reworked annotation styles, Cycles material overhaul, and Grasshopper 2 preview objects — are translated to their closest Rhino 7-native equivalent, exactly like Rhino's own "Save As Rhino 7".
Will my SubD or ShrinkWrap geometry survive from Rhino 8 to Rhino 7?
SubD is a Rhino 7+ feature and survives cleanly to Rhino 7. ShrinkWrap output from Rhino 8 is stored as a mesh and also survives.
Is my file uploaded to a server?
No. The conversion runs entirely in your browser using the official OpenNURBS WebAssembly build. Your Rhino 8 model never leaves your computer.
Is there a file size limit?
Free conversions support .3dm files up to 25 MB. Paid plans raise the limit to 200 MB (single) and 250 MB (unlimited) — enough for most architecture and product-design files.