Updated September 2026
You don't need Procreate, Photoshop, or a stencil printer to turn a photo into usable tattoo line art — a browser and five minutes gets you there. This walks through the full process end to end, plus the mistakes that produce a messy first result.
The single biggest factor in stencil quality is the source image, not the settings. A photo with strong, clear contrast between subject and background — a well-lit portrait, a bold logo, a high-contrast drawing — converts cleanly. A dim, low-contrast, or busy photo (cluttered background, soft studio lighting) will produce a messy or sparse result no matter how the sliders are set, because the tool traces real brightness edges — it can't invent contrast that isn't there. If your photo has a distracting background, crop tightly to the subject first in any basic photo app before uploading. See choosing a good source photo for more detail on this step specifically.
Drag the file onto the drop zone, or click "choose a file." Any JPG or PNG works. The moment it loads, a live preview appears with the default settings already applied — this is your starting point, not the final result.
This is the most important slider. It controls how sensitive the edge detector is: lower values pick up fine, subtle contrast changes (more lines, more detail, but also more noise from things like fabric texture or skin shading); higher values keep only the strongest, highest-contrast outlines. Start around the default and nudge it — for a simple bold-subject photo you'll usually want it higher (fewer, cleaner lines); for a detailed portrait where you want facial features preserved, lower it gradually until the important lines appear without the whole image turning into speckle.
If the preview looks like static or scattered dots rather than clean lines, increase "Smoothing." This blurs the image slightly before edge detection, which removes sensor noise and small texture detail that would otherwise register as false edges. Most phone photos benefit from a smoothing value of 1–2; already-clean source art (a logo, a digital line drawing) usually needs none.
A raw edge-detection line is often only one pixel wide — too thin to survive printing and thermal transfer reliably. Increase "Line thickness" until the lines are bold enough to hold up on paper; 1–2 is typical for standard printer output, higher if you're working with a lower-resolution printer or a coarser transfer method.
Standard output is black lines on white. Some transfer techniques and stencil papers expect the reverse (white lines on black, or a mirrored image) — check the "Invert" box if that's what your setup calls for.
Click "Download stencil" to save the PNG. When printing, set your printer to 100% scale / actual size — most printers default to "fit to page," which will resize your design and throw off proportions relative to the intended tattoo placement. Print a test page and measure it against a ruler if you're not sure your printer's 100% setting is accurate.
Once printed, the stencil is ready for thermal transfer paper or your preferred transfer method. See transferring a stencil onto skin for that step in detail.
Say you have a phone photo of a client's own line drawing on paper, shot under normal room lighting — slightly uneven light, a bit of shadow. Dropped in as-is, the default settings will likely pick up the shadow edges as extra lines. Bump smoothing to 1, raise line detail slightly to ignore the soft shadow gradient, and keep thickness low since it's already fine linework — a few slider nudges, watching the live preview update, usually gets a clean match to the original drawing within a minute.
Do I need an account or app? No — it's free, runs in any modern browser, and nothing is uploaded. See how it works for the technical detail.
Can I use this on my phone? Yes, the tool works on mobile browsers, though fine slider adjustments are easier on a larger screen.
Will it work on a tattoo I already have (photo of existing ink)? Yes, technically the same edge-detection process applies, though skin tone and lighting variation can add noise — increase smoothing accordingly.