A Meshmixer Alternative for Fixing Broken STL Files
Meshmixer's last update shipped in 2018 and Autodesk has confirmed it is no longer in development, pointing users to Fusion 360 instead. But people keep installing it for one reason: Analysis → Inspector fixes broken meshes in one click. This page is about replacing that one workflow.
Drop your STL file here
or
Nothing is uploaded — the repair runs on your own machine.
Why people are still looking for a Meshmixer replacement
Meshmixer was never really a modeling tool for most of the people who used it. It was the thing you opened when a downloaded STL refused to slice, clicked Inspector, hit Auto Repair All, and closed again. That single workflow is why it stayed installed on so many machines long after Autodesk moved on from it.
The problem is what "no longer developed" turns into over time. The last release was 2018, Autodesk has removed it from its site, and it no longer installs cleanly on current operating systems without workarounds. Autodesk's own answer is to move to Fusion 360 — which is a full CAD package requiring an account and a much heavier install than most people want for a one-click mesh fix. Meanwhile the models people need to repair keep getting denser, because scanners and AI generators produce far bigger meshes than 2016 hobbyist files.What this tool does instead
Everything above happens in the browser. There is no download, no account, and the file never leaves your machine — the repair engine is compiled to WebAssembly and runs on your own CPU. You can load this page, disconnect from the internet, and it still works.
The repair pipeline covers the same defects Inspector handled: boundary loops are closed, non-manifold edges and pinched vertices are separated, inverted faces are re-oriented, degenerate and duplicate triangles are removed, and overlapping shells are resolved with a boolean union.
The difference that actually matters: you get told what was wrong
Inspector showed you coloured spheres on the defects before fixing them. Almost every online repair tool that replaced it threw that away — you drag a file in, watch a spinner, and download something, with no idea what changed or whether it worked.
This tool reports the repair log in plain language: how many holes were sealed, how many faces were turned the right way round, how many zero-area triangles were removed, whether the result is watertight, and how many separate pieces the file contains. If a check was skipped because the model was too large, it says so instead of showing a green tick. That last point matters more than it sounds — a tool that silently skips a check and reports success is worse than one that fails loudly.
Side by side
| This tool | Meshmixer | |
|---|---|---|
| Install | None — runs in the browser | Desktop download, Windows / macOS |
| Development status | Current | Last update 2018; no longer developed |
| Auto repair | One click | One click (Inspector) |
| Tells you what was wrong | Written report, in plain English | Visual markers before repair |
| Privacy | File never leaves your machine | File never leaves your machine |
| Sculpting, supports, hollowing | No | Yes |
| Very large scans | Limited by browser memory | Limited by your RAM |
Details about Meshmixer were checked in August 2026. Software changes — check Autodesk's own pages for their current position before you decide.
When Meshmixer is still the right answer
If you need to sculpt, cut a model into printable parts, generate custom supports, hollow a solid, or blend two meshes together, Meshmixer still does things this tool does not attempt. It is a modeling application; this is a repair utility with one job.
The same is true for very large scan data. A browser tab has a hard memory ceiling, and a multi-million-triangle scan will hit it. This tool reads your file's triangle count before doing any work and tells you upfront whether it is realistic — including telling you to use desktop software when it isn't.
Have a file that won't slice? Drop it in the box at the top of this page. You'll see the triangle count and an estimated time before anything starts running.
Open the full repair toolFrequently asked questions
Is Meshmixer discontinued?
Yes. The last update shipped in 2018, Autodesk has confirmed it is no longer in development and has removed it from its website, and the official recommendation is to move to Fusion 360. Meshmixer still runs for many people, but it will not get fixes or compatibility updates, which is why so many users are looking to replace the Inspector repair workflow.
Does this replace all of Meshmixer?
No. It replaces the repair workflow — Analysis and Inspector. It does not sculpt, hollow, cut models into parts, or generate supports. If you need those, keep Meshmixer or move to Blender.
Is my model uploaded to a server?
No. The repair engine runs locally in your browser through WebAssembly. You can verify this by loading the page, disconnecting from the internet, and repairing a file anyway — it still works.
How large a file can it handle?
Roughly 5 MB (about 100,000 triangles) takes a few seconds on a desktop. Around 24 MB (500,000 triangles) takes about half a minute. Beyond that a desktop application is a better tool for the job, and the page will tell you so before it starts.