STL to PLY Converter
Convert an STL mesh to PLY, the standard format for 3D scans, photogrammetry and research tools.
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About Converting STL to PLY
STL is the universal 3D-printing format. It describes a model as a raw triangle mesh — just the surface geometry, with no colour, texture or units. Nearly every slicer and 3D printer accepts it, which is why it is the default export from most CAD tools for printing. When you need to move away from STL, the usual reason is simple: no colour, texture or material data.
Converting your STL 3D model to PLY solves that. PLY (the Stanford Triangle Format) stores a polygon mesh and can carry per-vertex colour, normals and custom properties. It is the standard output of 3D scanners and photogrammetry pipelines, available in both ASCII and binary variants. In practice you gain per-vertex colour and custom attributes and standard for 3d scans and photogrammetry. PrivConvert runs the whole STL-to-PLY conversion in server memory and deletes your file the instant the PLY is ready — nothing is stored, logged or reused.
When this conversion helps
- You need per-vertex colour and custom attributes
- You need standard for 3D scans and photogrammetry
- You need aSCII and compact binary variants
- Sharing a STL 3D model with someone whose software expects PLY
Tips for best results
- Files up to 250 MB are supported, and you can batch-convert several STL files at once; each is processed privately and deleted immediately.
How to Convert STL to PLY Online
Turning a STL file into PLY is straightforward here — upload, convert, download. What you gain with PLY: per-vertex colour and custom attributes.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from STL to PLY starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
A more private way to convert STL files
Plenty of sites convert STL files. Very few promise never to keep them — PrivConvert does, and backs it up with how the service is built.
Every conversion runs in its own locked-down process with no network access, so files can never leak or interfere with one another.
Your files are handled entirely by automated code. No staff, partner or AI model ever reads, stores or trains on your data.
Files are processed in volatile memory (RAM) and purged the instant your download is ready — nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your 3D model cannot be intercepted on the way to the server or back to you.
STL vs PLY - Format Comparison
| Feature | STL | PLY |
|---|---|---|
| File extension | .stl | .ply |
| Full name | Stereolithography | Polygon File Format |
| Introduced | 1987 | 1994 |
| Encoding | Binary | Binary |
| Editable | No | No |
| Open standard | Yes | Yes |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
Trusted by thousands of users
Professionals reach for PrivConvert when the 3D model they are converting is sensitive and cannot be left sitting on someone else’s server.