STLSTEP to STL

STEP / STP to STL online converter

STEP to STL Converter for clean web tool workflows.

Upload one `.step` or `.stp` file, convert it with an OpenCascade backend, preview the output STL, and download the result from a focused Next.js tool page.

Start convertingHow it works
30MB maxOne file at a timeOutput STL preview
No login requiredTemporary job filesStructured errors

Browser workflow

Upload STEP/STP

Waiting for a file

No account, dashboard, or payment flow is required for this MVP converter.

Guarded conversion30MB upload cap, one active conversion, 180s timeout, quota, and cooldown protect the shared VPS.
Output-first previewThe page previews only the generated STL, keeping the first release simple and honest.
Clear failure statesUnsupported files, busy backend, quota, rate limit, timeout, and conversion errors map to readable messages.

Output preview

STL viewer

3D preview appears after conversionOnly the output STL is previewed in this MVP.

How it works

How this STEP to STL converter works

  1. Upload one .step or .stp CAD file up to the 30MB MVP limit.
  2. Choose Fast, Standard, or High preset for the STL mesh output.
  3. The backend converts the file with OpenCascade and returns an STL download.
  4. Preview the generated STL in the browser before saving it locally.

Privacy and limits

Built for small, temporary CAD conversion jobs

  • Uploaded STEP/STP files are processed as temporary job files.
  • Generated STL files are returned to the browser and cleaned from the managed temp workspace after the request.
  • No login, history, payment account, or long-term file library exists in this MVP.

MVP scope

What to know before converting STP to STL online

  • One conversion runs at a time on the shared VPS to protect memory.
  • The current MVP does not preview the input STEP file before conversion.
  • Large or unusual CAD exports may fail; the backend returns a structured error instead of storing the file.
  • The conversion timeout is 180 seconds, so small models work best for the public MVP.

FAQ

STEP/STP to STL converter questions

What file types does this STEP to STL converter accept?

The MVP accepts one .step or .stp CAD file and converts it to an STL file for download.

What is the file size limit?

The public MVP limit is 30MB per file, with one conversion running at a time to protect the shared VPS.

Can I preview the original STEP file?

No. This MVP only previews the generated STL output after conversion; input STEP preview is intentionally out of scope.

How are uploaded CAD files handled?

Files are handled as temporary job data and cleaned from the managed temp workspace after processing. Avoid uploading confidential CAD files to any online converter unless you accept that risk.

Which quality preset should I choose?

Use Fast for quick checks, Standard for most small CAD files, and High when you want a finer STL mesh and can wait longer.