Convert a 3D Model to Binary STL for 3D Printing
Turn OBJ, PLY, glTF, GLB, Collada or 3MF into binary STL for Cura, PrusaSlicer or Bambu Studio. Converted on your own machine, nothing is uploaded.
3D Model to STL workspace
Drop files here or browse files
Drop a file here or browse to start.
- Accepts OBJ, PLY, glTF, GLB, Collada (.dae), 3MF or an existing STL and writes binary STL
- Binary rather than ASCII output, so a model that would be 60 MB of text lands at a fraction of that
- The whole scene is merged into one triangle set, which is what a slicer loads anyway
- Triangle count is verified before writing, so a scene with no printable geometry is reported rather than silently exported empty
STL describes a solid as a bare list of triangles with no colour, material or hierarchy, and this page merges your model's geometry into that form in the compact binary variant that slicers load fastest.
Built and maintained by Akash Kore · About
How to Use the Free Online 3D Model to STL Studio in 4 Steps
Simple 4-step walkthrough for fast, secure processing
Start from a mesh format
OBJ, PLY, glTF, GLB, Collada .dae or 3MF. CAD files such as STEP need tessellating in FreeCAD or similar before any mesh tool can read them.
Drop the model onto the page
The right three.js loader is fetched on demand and the geometry is parsed inside this tab.
Let the scene be merged and written
Triangle count is checked, the scene is flattened to a single triangle set, and the result is written as compact binary STL.
Open it in your slicer and fix the scale
Load the STL in Cura, PrusaSlicer or Bambu Studio, check the bounding-box dimensions against the real part, and scale by 1000 if the model came from a metre-based format.
EditPDFKit vs. Traditional Cloud Services for 3D Model to STL
Why thousands of privacy-conscious users choose EditPDFKit over cloud converters
| Feature | EditPDFKit (editpdfkit.com) | Traditional Cloud Tools (iLovePDF, Smallpdf) |
|---|---|---|
| Where Files Are Processed | Directly on Your Device (Zero Uploads) | Uploaded to Remote Company Servers |
| Privacy & Safety | Zero Uploads • Files Never Leave Your Device | Files Uploaded and Retained on Remote Company Servers |
| Local Hardware Acceleration | Uses your device's multi-core CPU and WebAssembly for instant output | Processes on shared cloud servers with upload and download delays |
| Built-in Privacy Vault | Saved Privately on Your Device (View or delete anytime) | Saved on Cloud Servers (Cannot verify if or when deleted) |
| Daily Usage Limits | 100% Unlimited & Free Forever | Free tiers commonly cap daily files; check their pricing pages |
| File Size Limits | No Limits (Process files of any size) | Free tiers commonly cap upload size; check their pricing pages |
| Works Without Internet | Yes • 100% Offline (Works without Wi-Fi) | No • Fails without constant internet connection |
| Account & Sign In | No Signup • No Login • Zero Email Required | Commonly requires an account or email to use fully |
| Watermarks on Your Files | 100% Clean • No Watermarks Ever | Free tiers commonly add a watermark or charge to remove it; check their pricing pages |
How 3D Model to STL Works: Keep Your Files Safe & Private
See step-by-step how your files are processed. Everything happens right inside your browser — your files are never uploaded to the internet or shared with anyone.
1. Open on Your Device
When you pick a file, your browser opens it directly on your computer or phone. Your document stays on your device and is never uploaded anywhere.
2. Process in Your Browser
Your device does all the work right inside your browser. Because there are no server queues or waiting lines, your files are processed instantly.
3. Save in Private Vault
When you save your work, your file is stored securely inside your browser's private vault on your device. You can view or reopen it anytime, even without internet.
4. Download, Reuse, or Delete
Download your finished file, send it directly to another tool without re-uploading, or click 'Clear Vault' to permanently erase your files anytime with one click.
How You Can Prove Your Files Never Leave Your Device
Open this tool, turn off your Wi-Fi or turn on Airplane Mode, and drop your file. It will still edit, convert, or compress and let you download the result! This proves the tool works completely offline without sending anything to any server.
Press F12 on your keyboard (or right-click anywhere and choose "Inspect"), click on the Network tab, and process your file. You will see 0 bytes of your file sent over the web — absolute proof of 100% privacy.
3D Model to STL Technical Specifications & Device Capabilities
Key features, device compatibility, and supported file types
Runs Directly on Your Device
Processed by your browser with zero waiting or upload lag
100% Private (0 Files Uploaded)
Safe for bank statements, IDs, tax forms, and confidential files
100% Watermark-Free
Clean original documents ready for official submissions
.obj, .stl, .ply, .glb, .gltf, .dae
Drag & drop or paste directly from clipboard (Ctrl+V)
100% Free With No Limits
No account needed, no daily limits, no paywalls
Works on All Phones & Computers
iPhone, Android, Windows PC, Mac, iPad, and Chromebook
Need to Hit an Exact File Size Upload Limit?
Online job boards, immigration visa portals, universities, and court e-filing systems enforce strict KB ceilings. Select a calibrated target size solver below to compress without losing readability.
Legal & Court Portals
Strict compliance while keeping vector text razor sharp.
Exam, Job & Visa Portals
The ceiling UPSC, SSC, bank exam and visa forms set most often.
Job Portals & HR Forms
Ideal for resume attachments, certificates, and multi-page scans.
Email & Universities
Reduces large PDF decks under standard mail attachment limits.
Any Custom Limit
Set an exact target size with interactive compression preview.
Looking for a Free Alternative to Popular Cloud Tools?
Unlike cloud-based services that upload your files to remote servers or enforce hourly limits, EditPDFKit runs 100% in your browser.
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Frequently Asked Questions About 3D Model to STL
Everything you need to know about 3D Model to STL on editpdfkit.com