How to Make a Laser-Cut Stencil That Actually Holds Together
To make a laser-cut stencil, you reduce your design to bold single-colour shapes, bridge every floating piece so it stays attached to the surrounding material, size the file in millimetres, and cut it from a thin durable sheet like mylar or acetate. The one step beginners skip is bridging: without it, the middle of an O or the dot of an i falls out and the stencil is ruined.
Step by step
- 1
Pick a stencil-friendly design
Bold shapes and thick lines cut and spray far better than fine detail. Simple, high-contrast art makes the strongest stencil.
- 2
Reduce to one colour
A stencil is a single cut layer: everything is either a hole or material. Convert your art to pure black-and-white shapes with no grey.
- 3
Bridge the floating islands
Add small connectors from every enclosed piece (letter centres, the middle of a ring) to the surrounding material so nothing drops out when cut.
- 4
Size it in millimetres
Set the real width so the stencil matches the surface you will spray or etch. Export SVG and DXF.
- 5
Cut from a thin durable sheet
Mylar (250 micron) and acetate are reusable and spray-friendly. Cardstock and vinyl work for one-off use.
What makes a stencil different from any other cut file
A stencil is a negative: the laser cuts away the shapes you want to spray or etch through, and the remaining material is the mask. That imposes two rules ordinary art does not have. First, everything must be a single cut colour, there is no shading, only hole or not-hole. Second, every enclosed region has to stay physically attached to the rest of the sheet, or it falls out and leaves a blob instead of a clean shape.
Bridging: the step that makes or breaks a stencil
The centre of an O, the hole in an 8, the inside of a ring, all of these are islands with nothing holding them in place once the outline is cut. Bridges are thin connectors that tie each island back to the surrounding material. Good bridges are placed where they read as part of the design and are wide enough to survive handling (around 1 to 2 mm on paper or thin acrylic). Our auto-bridging tool finds every floating piece and connects it for you, which is the tedious part done in seconds. See our guide on what bridging is for the full explanation.
The best materials for a stencil
For reusable stencils, 250-micron mylar is the maker standard: it is thin enough to cut fast, tough enough to spray hundreds of times, and it lies flat. Acetate is a cheaper reusable option. For a one-time stencil, cardstock or adhesive vinyl is fine and cuts on almost any laser or even a craft cutter. Whatever you use, thinner material holds fine detail better and needs less bridging.
Cut settings for common stencil materials
Mylar and acetate cut cleanly at low power and moderate speed on a CO2 or diode laser, do a test cut, because too much power melts and warps thin plastic. Cardstock cuts almost instantly. Never laser adhesive vinyl that contains PVC (it releases toxic chlorine gas); use a PVC-free vinyl or a craft cutter for those. When in doubt, run a small test square first.
From photo to stencil in one step
You do not have to do the reduce-and-bridge work by hand. Upload a photo or logo, and an AI tool can remove the background, simplify it into bold stencil shapes, bridge the floating pieces, and hand you a millimetre-sized SVG and DXF ready to cut. That turns a fiddly hour in Inkscape into about a minute, which is the whole point of using a converter.
Try it yourself
Turn a photo into a laser-ready file in about a minute, free, in your browser.
Auto-bridge your stencil for freeFrequently asked questions
What is the best material for a reusable laser-cut stencil?
250-micron mylar. It is thin enough to cut quickly, durable enough to spray many times, and lies flat. Acetate is a cheaper reusable alternative; cardstock or PVC-free vinyl works for one-time use.
Why do the middles of my letters fall out?
They are floating islands with nothing holding them to the sheet. You need to bridge them, add thin connectors from each enclosed piece to the surrounding material, so the stencil cuts as one part.
Can I make a stencil from a photo?
Yes. Remove the background, reduce the photo to bold single-colour shapes, bridge the floating pieces, and size it in mm. An AI stencil maker does all of that automatically and exports a cut-ready SVG and DXF.
What laser do I need to cut a stencil?
Almost any. Thin stencil materials (mylar, acetate, cardstock) cut on affordable CO2 and diode lasers at low power. The design work matters far more than the machine.
Related guides
What Is Bridging in Laser Cutting? (Floating Islands Explained)
Why parts fall out of stencils, and how bridges fix it.
How to Convert a Photo to SVG for Laser Cutting
Turn any photo into a clean, cuttable SVG, the right way.
How to Cut a Stencil on a Glowforge
From SVG to a clean cut stencil on the Glowforge.