Our Story
It started with a simple frustration. We wanted to take a flat image — a logo, a drawing, a photograph — and turn it into something we could actually hold. A 3D-printed relief. A personalised keychain. A wall plaque. It seemed like it should be straightforward.
It was not. Every tool we found either required expensive software licences, forced us to create accounts, added watermarks to the output, or capped the resolution behind a paywall. The free options were clunky and produced poor results. We kept asking: why does this need to be so hard or so expensive?
So in 2023, we built our own solution. We wrote a heightmap conversion engine that runs entirely in the browser — no server uploads, no accounts, no subscriptions. Just upload an image, adjust a few settings, and download a print-ready STL file in seconds. Completely free.
We put it online, shared it in a few 3D printing communities, and the response was immediate. People were looking for exactly this. Since then, thousands of makers, hobbyists, designers, and students have used imagetostl.net to bring their 2D ideas into the physical world — and that still motivates everything we do.
Why Is It Free?
We believe useful tools should be accessible to everyone — not just people who can afford a monthly subscription. 3D printing is already an investment in hardware and materials. The software to prepare your files should not add to that cost.
We keep the site running through non-intrusive advertising. That is it. No premium tier, no feature gating, no data selling. The converter you see is the full product — available to everyone, for free, forever.
What We Stand For
Free & Open Access
Good tools should not be locked behind paywalls. We built this because we needed it, and we share it because others need it too.
Your Files Stay Private
All conversion happens in your browser. Your images are never sent to our servers. What you upload stays on your device — always.
Simple & Fast
No installs, no sign-ups, no tutorials required. Upload, adjust, download. We respect your time.
How the Converter Works
Upload Your Image
Drop in any PNG or JPG file up to 10MB. Your image is processed locally — it never leaves your device.
Adjust the Settings
Control the height, smoothing, base thickness, and background removal. The 3D preview updates in real time as you tweak.
Download & Print
Download your STL file and open it in any slicer — Cura, PrusaSlicer, Bambu Studio. Your model is ready to print.
The Technology
Our converter uses a technique called heightmap conversion. Each pixel in your image has a brightness value between 0 (black) and 255 (white). We use that brightness to determine the height of the corresponding point in the 3D model — bright pixels become raised areas, dark pixels become recessed ones.
The entire process runs in WebGL and JavaScript, directly in your browser. There is no server-side rendering, no queue, and no waiting for a remote machine to process your file. Your device does all the work, which is why conversions happen in seconds and your images stay completely private.
Features like automatic background removal, smoothing filters, and base generation are all applied client-side before the final STL mesh is assembled and handed to you as a download.
Have a question or suggestion?
We read every message. If something is not working, or if you have an idea to make the tool better, we would love to hear from you.