IsItPrintable
Local-first 3D toolbox

3D model tools that keep your files on your machine.

Inspect, convert, repair, and check models for printing in your browser. Files are streamed with File.slice() and parsed in a Worker—nothing is uploaded.

Open the STL viewerBrowse all tools
Zero uploadWorker streamingPrint-ready checks
Local processing pipeline
on-device
01
File.slice()
Reads the file directly from disk in aligned slices.
02
Worker
Parsing, conversion, repair, and checks run off the main thread.
03
Local download
Results are assembled in the browser; no server round-trip.
No uploadFile stays on device

Available now

Start with a model

Open a model to convert, repair, or check it for printing—without sending a byte anywhere.

54 tools
Inspect & measureReady

Local STL viewer and geometry inspector

Inspect STL files locally in your browser. Stream triangle data in a Worker, see welded vertex counts, bounds, surface area and volume, and cache a decimated preview for fast repeat opens. No upload.

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Format conversionReady

STL to OBJ converter (local)

Convert STL to OBJ locally in your browser. Streamed binary STL, welded vertices, indexed OBJ output, and no uploads.

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Format conversionReady

3MF to STL converter (local)

Convert 3MF to STL locally in your browser. 3MF ZIP/XML parsing, build transforms, unit normalization, no uploads.

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Mesh repairReady

One-click mesh repair (local)

Repair STL, OBJ, PLY, 3MF, GLB or glTF meshes in your browser: weld vertices, fix non-manifold edges and bow-tie vertices, close holes, unify normals and remove self-intersections. No upload.

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Mesh repairReady

Mesh topology and manifold check (local)

Check mesh manifold, watertight, shells, boundary loops, Euler characteristic, genus and self-intersections locally. STL, OBJ, PLY, 3MF, GLB and glTF input; no upload.

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Print readinessReady

3D printer bed fit checker (local)

Check whether a 3D model fits your printer bed. Compare STL, OBJ, PLY, 3MF, GLB or glTF bounds with common build volumes locally, with units and clearance.

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Categories

Browse by workflow

31 tools

Format conversion

Convert between mesh formats, or tessellate STEP / IGES / BREP into a mesh.

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9 tools

Mesh repair

Fill holes, weld vertices, unify normals, and remove degenerate or non-manifold faces.

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5 tools

Transform & optimize

Scale, rotate, center, place on the bed, decimate, hollow, and split.

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6 tools

Print readiness

Wall thickness, overhang, build-volume fit, and material/time estimates.

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1 tool

G-code

Layer preview, layer count, path length, and filament statistics.

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2 tools

Inspect & measure

View the model and inspect triangles, bounds, volume, and sections.

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11 printers

Printers

Check a model against a printer build volume: six orientations and XY clearance.

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6 profiles

Wall thickness

Check a model against material- and nozzle-specific wall guidance locally.

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Formats

One kernel, many formats

STL, OBJ, PLY, 3MF, GLB, and glTF convert between each other. STEP, IGES, and BREP tessellate into meshes, and G-code is analyzed locally.

STLOBJPLY3MFglTFGLBSTEPIGESBREPG-code

Why local

Built for private, heavy files

Zero upload
Files are read with File.slice() and never leave the browser. The Network panel stays empty.
Worker streaming
Parsing runs in a dedicated Worker, so the page stays responsive even with a 500 MB STL.
Print-ready checks
Manifold, wall thickness, overhang, bed-fit, material, and printability checks run locally.