One click: holes → quad grid, n-gons → quads, boolean mess → clean. New in 1.2: Boolean union with a quad seam.

QuadFix repairs the things that break imported, booleaned and AI-generated meshes: holes, n-gons and triangle soup. Select the mess, press one button, get quads. No external binaries, pure Python on Blender's own bmesh, works on Windows, macOS and Linux.

What it does

• Fill Holes with Quads — closes holes with a proper quad grid, no triangle fans.
• N-gons to Quads — converts curved n-gons and triangles to quads; flat CAD faces stay untouched.
• Clean & Quad (Boolean Prep) — merge doubles, remove junk geometry, limited dissolve (keeps sharp edges), tris-to-quads. One click after a boolean or an import.
• NEW: Union to Quads — exact Boolean union of two or more meshes, then the seam is rebuilt as a strip of quads instead of triangles and n-gons. Originals are hidden, not deleted. A shape-change limit protects your surface; seams it cannot rebuild cleanly stay a plain Boolean and are reported.
• Select Non-Quads & Holes — shows what needs fixing, with a count.
• Only Selected — fix one area without touching the rest.
• Undo-safe. Live before/after report of quads, triangles and n-gons.

Made for

Game artists cleaning AI meshes (Tripo, Meshy, Hunyuan), hard-surface modelers after booleans, 3D-print and CAD users repairing STL imports and scans.

Requirements

Blender 4.2 or newer (extension format). Tested on Blender 4.2.23, 4.5.14 and 5.2.2.

Install

Edit → Preferences → Get Extensions → ▾ (top right) → Install from Disk → pick the zip. Then press N in the 3D viewport and open the QuadFix tab. Mesh tools work in Edit Mode (Tab), Union to Quads in Object Mode. Tools that do not fit the current mode are shown greyed out.

Honest limits

Not an auto-retopology tool: it repairs what is there. Very irregular scans may keep a few triangles. Union to Quads rebuilds seams only: no UVs for the new strip, seams running through holes in your input stay a plain Boolean, and on dense meshes with very different density on both sides the strip is all quads but zig-zag.

Free version

A free subset (N-gons to Quads, Clean & Quad, Select Non-Quads) is on GitHub: github.com/quadfix-tools/quadfix-lite

Free updates for 1.x. Questions: message me here or email [email protected].