STL Editor
Use the STL editor to scale, rotate and move a whole mesh, then export the changed geometry.
Edit STL online LESS SETUP. MORE MAKING.
Free STL Editor Online
Edit STL online for a better fit.
This free online STL editor scales, rotates and moves whole models. Open a file or choose a tool below for viewing, resizing, measurement or conversion.
Your files stay yours.Local processing. Zero uploads.
Loading your local 3D workspace…
No account needed Free STL export Works in your browserFROM FILE TO FIT. IN A FEW CLICKS.
ONE FILE. A FEW GOOD TOOLS.
STL Tools
Choose a task.
STL Viewer
Inspect a mesh in the STL viewer, with wireframe and dimensions.
Open STL viewerSTL Resizer
Resize by percentage or target dimensions, with optional locked proportions.
Resize STL filesSTL Measure
Check dimensions, surface area and eligible volume; download a JSON report.
Measure STL dimensionsSTL Simplifier
Reduce triangles with a target count and compare the mesh and bounding dimensions.
Reduce mesh trianglesSTL Converters
Move geometry between mesh formats with local processing.
3MF to STL
Extract geometry from supported slicer 3MF projects; colors and print settings are lost.
Open converterSTL to 3MF
Package a prototype with millimeter units, choosing mm or inch for source coordinates.
Open converterBinary STL to ASCII
Write readable ASCII facets from binary STL without changing the triangle count.
Convert to ASCIIASCII STL to Binary
Replace text facets with compact binary records while preserving parsed geometry.
Convert to binarySTL to SVG
Create SVG vector contours from an XY, XZ or YZ cross-section at a chosen height.
Create vector sectionBUILT FOR THE IN-BETWEEN.
Free, Private and No Sign-Up
This STL editor is free, with no account, sign-up or monthly usage limits. Work within the file limits: one input at a time, up to 25 MiB and 400,000 triangles. Converters also enforce archive and memory safeguards; complex models can exceed device memory.
Open the editing workspacePrivate by default
The STL editor processes files locally in your browser; model files are never uploaded. Save your download before leaving because there is no cloud project or autosave.
Check a CAD export
Inspect a tessellated CAD export’s silhouette and overall size before sharing a prototype. A preview cannot verify hole tolerances or reconstruct CAD features.
Prepare a part before slicing
Use this free STL editor for size and orientation corrections before slicing. Resize a display model to fit your printer bed, leaving space for supports. Mesh repair requires other software.
A SHORT PATH TO YOUR NEXT PRINT.
How the Online STL Editor Works
Bring your model
Drop an ASCII or binary model into the workspace, or try the sample cube first. Check the starting dimensions so you have a reference for every change.
Make your adjustment
Use the STL editor controls to scale, rotate or move the entire mesh. Apply one change at a time and compare the dimensions; undo if the result is not what you intended.
Take it with you
Export a binary file with your adjustments included. Reopen it to verify the result, then check your slicer settings and clearances before starting a long print.
Learn how to apply whole-model transforms.
.STL
Supported Formats
25 MiB / 400k trianglesThe editor imports ASCII or binary STL and exports binary STL. Dedicated tools convert between both encodings, convert 3MF geometry, reduce triangles or create SVG cross-sections. Processing stays local; file limits apply.
A FEW THINGS TO KNOW
STL Editor FAQ
Is STL Editor Online free to use?
Yes. Whole-model transforms, previews, measurements and binary export are free, without an account. Use the workspace above or choose a focused tool for your task.
Where can I check a model’s overall size?
Use the dedicated measurement workspace for overall dimensions, surface statistics and a downloadable report. Open the STL measurement tool.
How do I resize or reduce the scale of a model for 3D printing?
To reduce STL scale uniformly, enter 50 percent to halve every dimension, or set a target dimension with proportions locked. Scaling also changes holes, clearances and wall thickness, so check the resulting size and your print setup before exporting.
Is my STL file uploaded to a server?
No. The online STL editor parses models, applies changes and creates downloads in your browser. Models are not sent to a server or saved between sessions. Export before refreshing or switching tools; navigation clears your model and undo history.
Can I edit 3D printer models without CAD software?
Yes, for whole-mesh changes. The STL editor can scale, rotate and move a downloaded part. Individual vertex edits, cuts and boolean operations are outside its scope. Use CAD software to redesign a mounting hole or change a specific feature.
Does STL store units?
No. The format stores coordinates without physical units; this STL editor interprets them as millimeters. If the source was designed in inches, confirm its intended size before applying a conversion such as 25.4 times. Check dimensions again in your slicer because importing software may use a different unit assumption.
Can I edit 3D models online on a phone or tablet?
The preview needs JavaScript, Web Workers and WebGL. Touch orbit, pinch zoom and two-finger pan help you inspect parts. The STL editor accepts up to 25 MiB and 400,000 triangles; larger meshes work best on a desktop with more memory.
Will the exported file include my changes?
Yes. The STL editor writes transformed vertex coordinates into a binary download, rather than saving only a camera view. Reopen the result, verify dimensions and review orientation, supports and fit in your slicer. Export does not certify a mesh as watertight or guarantee that a part is printable.