Mirror editing without a Mirror modifier
— plus topology symmetrize that preserves vertex IDs.

CL_LiveMirror is an add-on that combines modifier-free mirror editing with a high-precision, vertex-ID-preserving topology symmetrize.
It covers both "editing both sides at once" and "making both sides match" — in a single tool.

Mirror editing — one click, No Mirror Modifier

Just hit the LiveMirror button in the top-right of the viewport — that's it. Mirror mode turns on, and a set of mirror-aware versions of common mesh-editing tools becomes available, letting you edit both sides at once with your asymmetric UVs fully preserved (except for new faces created by tools like Bevel and Extrude, which you'll unwrap yourself). Their shortcuts are based on Blender's defaults, remapped for comfortable one-handed use, and listed right in the panel.

Topology symmetrize — vertex IDs preserved

One click on the center edge snaps a drifted model back into symmetry. It matches by topology, not shape, and keeps your existing vertex IDs — so vertex groups, shape keys, and rig weights stay intact.

Mirror tools included

Ctrl+RMirror Loop Cut

Insert loops symmetrically. Adjust the number of loops, with an option to auto-apply edge flow right after the cut. UVs preserved.

KMirror Knife

Surface cut on a face — or click in empty space to project a straight line and cut all the way through, front and back.

IMirror Inset

Inset the selected faces, on both sides at once.
Press the I key during operation to toggle between “Equal (Region)” and “Individual.”

JMirror Connect

Connect selected vertices with new edges, on both sides at once.

MMirror Merge(menu)

Merge vertices symmetrically, keeping UVs intact.

X · pieMirror Delete & Collapse

Delete or collapse with full mirror support — collapse while keeping UVs intact.

Ctrl+Alt+←/→Mirror Edge Rotate

Rotate the shared edge between two faces, symmetrically on both sides.

Ctrl+Shift+XMirror Edge Flow

This feature rearranges the vertices of a selected edge loop (a connected set of quadrangles) along a smooth curve that follows the flow (curvature) of the adjacent edges. Similar to Maya’s Edge Flow, it automatically corrects the UVs as the vertices are moved to minimize texture distortion.

Shift+X · pieMirror Edge Marks

Mark / clear Seam, Sharp, Crease, Bevel Weight, and Freestyle on both sides at once — with adjustable amounts for crease and bevel weight.

Ctrl+BMirror Bevel
Bevel edges or vertices on both sides at once. Adjust width and segments interactively. New faces need new UVs, so unwrap them afterward.

Ctrl+E · pieMirror Extrude
Pie menu for symmetric extrusion — Region, Along Normals, Individual, To Cursor, and Manifold. New faces need new UVs, so unwrap them afterward.

Ctrl+TMirror Triangulate
Triangulate faces symmetrically. Diagonals match on both sides, and your UVs stay intact.

Alt+JMirror Tris to Quads
Join triangles into quads symmetrically, keeping both sides identical and UVs untouched.

Shift+Ctrl+F · pieMirror Fill
Pie menu for symmetric filling — Fill, Grid Fill, and Bridge Edge Loops. UVs follow Blender's standard behavior; new faces may need unwrapping.

Rip vertices open on both sides, mirrored — with or without filling the gap. Drag to choose which side splits, and press U to keep the original UV layout as it opens.

Actively expanding — more mirror-aware tools are added in ongoing updates.

Each tool is a dedicated, mirror-aware tool — separate from Blender's standard tool of the same name — so its operation can differ slightly from the standard. Shortcuts are based on Blender's defaults, remapped for comfortable one-handed use, and listed in the panel.

Topology Symmetrize

The add-on's second pillar. When one side of a model has drifted out of alignment, one click on the center edge restores symmetry. It works from connectivity (topology), not shape, and preserves your existing vertex IDs — so vertex groups, shape keys, and rig weights stay intact. Launch it from Mesh > Mirror or the CL LM sidebar tab.

Works without a center edge — for separate parts like eyes that have no center edge, symmetrize using the object origin or the 3D cursor as the mirror plane.

Partial symmetrize — pre-select vertices and only their mirror counterparts update, great for fixing just one area.

Manual seeding — click corresponding edges on each side to guide the pairing, so even badly broken meshes symmetrize consistently.

Recenter to origin — when the symmetry plane is off from X=0, the tool can shift the mesh onto the origin for you before symmetrizing.

Flatten center seam — project drifted center-seam vertices back onto the symmetry plane before symmetrizing.

Shape-key friendly — because vertex IDs are preserved, it fits shape-key adjustment and other ID-dependent workflows.