StlFixTool
Convert and repair 3D and CAD files online — STEP, STL, OBJ, GLB and 3MF. Every job is verified for watertightness and solid count, with a free 3D preview before you pay per file.
Convert and repair 3D and CAD files online — STEP, STL, OBJ, GLB and 3MF. Every job is verified for watertightness and solid count, with a free 3D preview before you pay per file.
This page is designed to help you find out whether StlFixTool is good and if it is the right choice for you.
StlFixTool converts and repairs 3D and CAD files in the browser, with no installation and no account. It handles STEP to STL, STL to STEP, OBJ, GLB/glTF and 3MF in both directions, plus mesh repair for holes, non-manifold edges, duplicate faces and inconsistent normals.
What separates it from other converters is the verification pass. Before you pay, every job reports watertightness, manifold edges, solid count in versus out, and triangle count, alongside a 3D preview of the actual result. Assemblies keep their solids topologically separate, so interface geometry isn't lost to global vertex welding — a common failure that produces a file which opens in CAD but behaves as a surface body with most operations unavailable.
It does not reverse-engineer. Converting a mesh to STEP produces faceted BREP geometry, not a parametric model with a feature tree, and that limitation is stated on every relevant page rather than discovered after payment.
Pricing is per file, $2.99 to $5.99, with no subscription. Viewers and the editor are free. Unpurchased files are deleted within an hour; purchased ones stay available for seven days.
Listed in
Input formats
STL, STEP, STP, OBJ, GLB, glTF, 3MF
Output formats
STL, STEP, OBJ, 3MF
Pre-payment verification
Watertightness, manifold edges, solid count and triangle count reported before you pay
Free 3D preview
Inspect the actual converted result in the browser before purchasing
Mesh repair
Holes, non-manifold edges, duplicate and degenerate faces, inconsistent normals
Assembly handling
Solids kept topologically separate, so interface geometry is not lost to vertex welding
Viewers
Free browser viewers for STL, STEP and 3MF
Editor
Free browser STL editor — scale, rotate, mirror, export
Maximum file size
50 MB for STL, 100 MB for STEP
Output units
Millimetres
Pricing
$2.99–$5.99 per file, one-time, no subscription
Account
Not required
File Retention
1 hour if unpurchased, 7 days after purchase
Payments
Processed by Paddle as merchant of record
Every conversion is verified before you download it. StlFixTool checks the output against the input (volume, bounding dimensions, watertightness) and shows you the result, including any simplification it applied. It doesn't hand you a file and hope. Multi-part assemblies keep each solid's topology separate, so parts don't get fused or broken at their boundaries. You pay per file, with no subscription and no account plan to cancel.
If you only need one file converted or repaired, you shouldn't need a monthly plan. StlFixTool charges per file ($2.99–$5.99), shows a 3D preview and a verification report before you pay, and outputs in millimetres. The viewers and the STL editor are free. Uploads are deleted automatically: after 1 hour if unpaid, after 7 days once paid.
People who need a 3D file in a different format or a broken mesh fixed, without installing CAD software. That's mostly 3D printing hobbyists and makers turning STEP/3MF/OBJ/GLB files into printable STL, people whose slicer rejects a model as non-manifold or full of holes, and engineers or designers who need an STL turned back into a STEP file for a CAD tool.
StlFixTool started as a simple question: why does converting one CAD file mean a subscription or a desktop install? Building it turned out to be harder than it looked. The worst bug was a vertex-welding step that silently merged points across separate solids in an assembly, which broke closed parts without any visible error. That bug is why every conversion now runs an automatic verification check before delivery. The full write-up is on dev.to: "The vertex weld that silently broke every assembly I converted".
We have collected here some useful links to help you find out if StlFixTool is good.
Check the traffic stats of StlFixTool on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of StlFixTool on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of StlFixTool's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of StlFixTool on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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