LoopTools is eight small operators for cleaning up edge loops — rounding an opening, flattening a group of faces, evening out vertex spacing, bridging two holes with controllable quad flow. It shipped inside Blender up to 4.1 and is now installed separately. It replaces the hand version of those jobs: nudging vertices one at a time until a hole looks round, or building a custom transform orientation to scale a face group flat.
What It Does
- Circle arranges a loop or vertex selection into a circle, and can project onto the existing mesh instead of a flat plane
- Flatten projects a selection onto a plane it calculates for you — best fit, face normal, or view
- Space and Relax redistribute and smooth vertices along a loop, the usual cleanup after a boolean, knife cut or retopology pass
- Bridge and Loft connect two openings, or a sequence of them, generating the intermediate rows with segment, interpolation and twist controls
- Curve reshapes vertices along a curved path; GStretch matches vertices to a drawn Annotation stroke
- All of it sits in the viewport sidebar Edit tab and the right-click menu
Good To Know
- Free and open source under GPL-2.0-or-later, maintained as Community; originally by Bart Crouch and Vladimir Spivak
- Version 4.7.7, Blender 4.2 LTS and newer, 30 KB, no permissions required
- 2.1 million+ downloads on Blender Extensions, rated 5.0 from 146 reviews
- Bundled with Blender through 4.1, not bundled now. Tutorials telling you to tick a checkbox in Preferences are out of date
- One release since May 2024, and the listing states support is limited
- Relax on a closed loop shrinks it when interpolation is linear — the manual says use cubic, and the default will quietly cost you volume
- Curve treats the selected loops as control points, not as the geometry it moves
- Selection rules are strict — Relax and Space take one loop, Bridge takes two closed loops or two face groups. A general selection is the usual reason nothing happens
- GStretch needs an active Annotation stroke to already exist, is the one tool the manual never documented, and carries the longest trail of tracker bug reports. Test it first
Where It Fits
At 30 KB with no dependencies and no render-time cost, there is little reason for a modeller not to have it installed — Circle, Flatten and Space pay for it in the first hour. Treat the rest as situational: GStretch is fragile, Relax is not a volume-preserving smooth. It is not a maintained add-on with a release cadence, but for the mesh operators Blender never shipped natively it is still the standard answer.