How to Convert a Logo to STL Without CAD

Why extrusion is the right method for a flat logo

A logo already describes its important geometry through outlines and negative space. For a badge, plaque, sign or insert, a controlled extrusion is more predictable than asking a model to infer an unseen back and sides.

Reforgers performs this workflow locally in the browser. The source image stays on the device while the mask and Three.js mesh update as the controls move.

Example: turn a two-letter mark into a 50 mm STL

Open the free logo-to-STL tool and load the sample mark or your own PNG, JPG, WebP or SVG. In our example, the source is a simple dark mark on white. The default 50 mm width and 3 mm extrusion produce a compact badge-sized part.

• Move the background threshold until both letters are solid and the white field disappears.
• Invert the mask if the background becomes solid instead of the artwork.
• Use silhouette cleanup sparingly: too much can close intentional counters inside letters.

Make disconnected artwork printable

Separate letters and symbols become separate solids. That is fine for individual inserts, but a one-piece badge needs a backing plate. Increase the backing setting until every island meets the shared base.

Edge rounding softens the top rim and can make a small badge feel more finished. Keep it below the extrusion depth so the relief remains clearly defined.

Choose detail based on the final size

More contour samples do not automatically create a better print. At 50 mm wide, details narrower than a nozzle line may disappear even if the STL contains them. Use the preview to simplify noisy pixels, then let the slicer show what the printer can actually resolve.

Transparent PNGs and clean vector exports usually need less threshold adjustment than compressed screenshots. If lettering is very small, remove the tagline or enlarge the final part.

Download and run the final slicer check

Saving stores the project in the current browser. STL download requires a free Reforgers account, but no credit is consumed for this tool. Import the file into your slicer and confirm millimeters, bed contact, wall behavior and the smallest gaps before printing.

For a full sculpture inferred from a character or product photo, use the image-to-3D generator instead. The extrusion tool is intentionally specialized for flat, graphic source material.