Convert & Prepare
Engineering Files.

STL to STEP, CAD to print-ready mesh, and 400+ everyday formats too. Real-time progress, no signup, no watermarks. Built for files other converters don't handle.

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Auto-detects CAD, Video, PDF, and 200+ formats

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Engineering & 3D Files

Convert, repair, and analyse CAD and mesh files — including print readiness, cost, and orientation before you commit a printer

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3D & CAD Tools

3D printing works with meshes; CAD software works with surface geometry. Moving between the two takes real geometry conversion, not a renamed file extension. These tools run FreeCAD's OpenCASCADE engine in the cloud, so you don't have to install anything.

Beyond conversion: check wall thickness and overhangs, estimate print cost, and find the orientation that needs the least support — before the printer finds out for you.

Explore all 3D & CAD tools →

STL → STEPOpen →

Mesh to editable CAD geometry. Best for mechanical parts.

STL Checker & RepairOpen →

Defect report first, watertight fix second. Nothing changes silently.

Print Readiness CheckerOpen →

Wall thickness and overhangs, measured against your printer’s limits.

Print Cost CalculatorOpen →

Grams, dollars, and hours from the mesh volume. An estimate, not a quote.

Print OrientationOpen →

Every resting face tried and ranked. Download the STL already rotated.

More Dedicated Tools

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Passport & ID Photos

Make a compliant passport or ID photo from any portrait, sized to spec.

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Animation & Mocap

Turn a video of a person moving into BVH or CSV skeletal animation.

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GIS & Mapping

Move map data between Google Earth, web maps, and desktop GIS.

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Subtitles & Captions

Translate subtitle formats with timing kept to the millisecond.

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Medical Imaging

View and share DICOM scans without radiology software.

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Popular Converters

PDF → DOCX HEIC → JPG PDF → JPG JPG → PDF MP4 → MP3 DOCX → PDF PNG → JPG WEBP → JPG MOV → MP4 XLSX → CSV SVG → PNG MP4 → GIF

Browse all 400+ supported formats →

Convert by File Type

DocumentsPDF, DOCX, ODT ImagesJPG, PNG, WEBP VideoMP4, MOV, MKV AudioMP3, WAV, FLAC SpreadsheetsXLSX, CSV, ODS 3D & CADSTL, OBJ, FBX GIS & MapsKML, SHP, GeoJSON MedicalDICOM, DCM

Developer API

The same converters, from your code

Every tool on this site is callable over a REST API: upload a file, get a job id, poll or get a webhook when it finishes. STL to STEP, mesh repair, print analysis, and 200+ format pairs.

A free account is enough to get a key. Higher limits come with paid plans.

Read the API docs →

curl -X POST https://converterflow.io/api/v1/convert \
  -H "Authorization: Bearer cf_live_..." \
  -F "file=@bracket.stl" \
  -F "target_format=STEP" \
  -F "webhook_url=https://your.app/hooks/converted"

{ "job_id": "6f9c1e2a", "status": "waiting", ... }

Learn & Resources

Guides, tutorials, and deep dives into file formats

Guides

All Guides

Nineteen practical guides across 3D printing, CAD formats, mesh repair, mocap, GIS, subtitles, and medical imaging — each one built around a real tool.

Browse guides →

Guide