Simpel3D
Simpel3D is a web-based converter for 3D files, including STEP, IGES, STL, OBJ and 3MF, producing STL, OBJ or 3MF output.
What Simpel3D is
Simpel3D is a web-based converter for 3D files, including STEP, IGES, STL, OBJ and 3MF, producing STL, OBJ or 3MF output. The site says conversion runs locally in the browser using WebAssembly and that files are not uploaded to its servers. Large STEP assemblies can be divided into individual printable parts and downloaded as a ZIP. After conversion, the tool reports watertight status, dimensions, triangle count and volume. Simpel3D says its output is tested in Cura, PrusaSlicer and Bambu Studio. The free plan allows three conversions per day, STEP files up to 10MB and personal use. Paid options include a 1.99 USD one-time Day Pass, monthly plans at 6.99 USD for Standard and 12.99 USD for Pro, and annual plans at 69.00 USD for Standard Annual and 99.00 USD for Pro Annual. Standard and Pro include commercial use. Simpel3D does not convert files back to STEP or IGES. Its privacy policy says it collects no analytics or IP addresses.
Good
- Conversion runs locally in the browser.
- Can split large STEP assemblies into printable parts.
- Reports mesh health and model measurements.
- Free plan includes three daily conversions.
Watch out
- Free STEP files are limited to 10MB.
- Free plan is for personal use only.
- Cannot convert files back to STEP or IGES.
- Pro supports files up to 60MB.
Who it suits
Simpel3D suits makers preparing supported 3D files for printing, especially those working with STEP assemblies. The free tier is for personal use; Standard and Pro include commercial use.
Verdict
Simpel3D covers common 3D input and output formats and provides useful mesh details after conversion. Check the free tier’s daily and file-size limits, and note that STEP and IGES output is unavailable.
Plans and prices
From Simpel3D's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 3 conversions/day · STEP up to 10MB · STL, OBJ, 3MF output · personal use only · forever |
| Day Pass | $1.99, paid once | Unlimited 24hrs · STEP up to 30MB · batch 3 files · commercial license · no subscription · one-time · 24 hours |
| Standard | $6.99 a month | 15 conversions/day · STEP up to 30MB · batch 3 files · commercial license · per month |
| Pro | $12.99 a month | Unlimited · STEP up to 60MB · batch 5 files · commercial license · privacy certificate · per month |
| Standard Annual | $69 a year | 15 conversions/day · STEP up to 30MB · batch 3 files · commercial license · $69/yr — save 2 months |
| Pro Annual | $99 a year | Unlimited · STEP up to 60MB · batch 5 files · commercial license · privacy certificate · $99/yr — save 2 months |
The facts
Each one read from Simpel3D's own pages, with the date it was checked.
What it does
- Audience
- The site describes Simpel3D as made for makers and says the free tier is for personal use, while Standard and Pro include commercial use.checked 8 Oct 2026
- Format limit
- Simpel3D does not support conversion back to STEP or IGES.checked 8 Oct 2026
- Large assemblies
- Large STEP assemblies can be split automatically into individual printable parts and downloaded as a ZIP.checked 8 Oct 2026
- Local processing
- The site says conversion runs locally in the browser using WebAssembly, and files are not uploaded to its servers.checked 8 Oct 2026
- Mesh health
- After conversion, the tool reports watertight status, dimensions, triangle count, and volume.checked 8 Oct 2026
- Payment and hosting
- The privacy policy names Paddle for payment processing, Cloudflare Pages for hosting, and JSDelivr for delivery of the WebAssembly library.checked 8 Oct 2026
- Privacy and data
- The privacy policy says it collects no analytics and does not collect IP addresses; the daily conversion counter is stored in browser localStorage.checked 8 Oct 2026
- Purpose
- Simpel3D converts 3D files including STEP, IGES, STL, OBJ, and 3MF into STL, OBJ, or 3MF output.checked 8 Oct 2026
- Slicer compatibility
- The site says its output is tested in Cura, PrusaSlicer, and Bambu Studio.checked 8 Oct 2026
- Support
- The privacy policy provides an email contact for support and says it will respond to rights requests within 30 days.checked 8 Oct 2026
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