Best Stencil Maker Apps for iPhone: 7 Methods Compared

What does a stencil maker app actually have to do?

A stencil maker app has one job: turn an image with tones into an image with two values, black where material is cut away or ink is laid down, white everywhere else. How it gets there is the whole difference between the tools below. Threshold-based tools pick a brightness cut-off and keep every pixel darker than it, which is fast but reproduces every shadow and every noisy patch of skin. Outline-based tools, whether an AI model or a person with a stylus, redraw the subject as continuous lines, drop the shading and close the shapes. Vector tools convert either result into paths a cutting machine can follow. Beyond that core, you are judging four practical things: which device it runs on, how much skill it assumes, how it charges, and whether the output is a PNG for printing or a vector for cutting. The table in the next section scores every tool type on exactly those.

Which tool type fits you?

Read the table by the column that constrains you most. If you only own an iPhone, the platform column eliminates most of it immediately. If you refuse to pay, the cost column does. If the stencil has to feed a cutting machine, the best-for column points you at the last row no matter where you start. Prices are quoted only for Stencil AI, because those are the ones this site can state precisely; the other cost models are described in general terms and change over time.

AI stencil apps: Stencil AI

Stencil AI - Photo to Stencil is the example here because it is the app this site is built around. You pick a photo from the camera or library, tap Convert to Stencil, and an AI image model redraws the subject as continuous black outlines on white: shading is dropped, shapes are closed, and solid blacks are kept where the design needs them, such as a tiger's stripes or the black of a pupil. The result opens in a before/after slider and lands in a Collection, and a four-tool editor handles Line Weight, Darkness and Smoothing sliders, crop, rotate, flip and mirror, line colour with a transparent-paper export, and a draw/erase brush. The first stencil is free. Further conversions are in-app purchases, with the options shown inside the app. The complete tool-by-tool guide walks through every control.

PhotoStencil

Where Stencil AI falls short

It is iPhone only: no iPad-specific layout, no Android app and no web version, and it needs iOS 26.2 or later. Conversions beyond the first are in-app purchases, whereas GIMP costs nothing forever. The photo has to be uploaded to a cloud function to be processed, so it does not work offline. Output is a PNG, not a vector, so cutting-machine users still trace it in their machine software. And the model makes the outline decisions for you; if you want to choose exactly which contour survives, a manual tool wins. It is the right choice when speed and a clean first result matter more than node-level control.

Adobe Photoshop: threshold and posterize

Photoshop is the reference tool for the threshold route. Convert the photo to greyscale, apply Threshold and drag the cut-off until the subject separates from the background, then clean the result with a hard brush. Posterize does the same job with several flat tones instead of two, which is how you build a multi-layer stencil, one layer per tone. It runs on desktop and on iPad, on a subscription. The strength is control: every pixel is yours, and you can combine a threshold layer with a hand-drawn outline layer on top. The weakness is inherent to the method. Threshold keeps dark pixels, so a photo with soft light produces broken, noisy lines where the shadow fades, and you spend the time you saved on cleanup. The AI photo to stencil vs threshold filter post shows both results side by side, and the four methods to turn a photo into a stencil guide covers the Photoshop steps in order.

Procreate: manual tracing on iPad

Procreate is a drawing app, not a converter, and that is the point. Drop the photo on a layer, lower its opacity, add a new layer on top and trace the contours by hand with a monoline brush. You decide which edge becomes a line, which shadow becomes a solid black and which detail disappears, and the result is a drawing rather than a filtered photo. It is a one-time purchase and it runs on iPad, not iPhone, so for this list it only counts if you own both. The skill requirement is real: a steady stylus hand and an understanding of which lines carry a design. Expect a portrait to take a sitting rather than a minute. It is the best route when the stencil is the artwork, as in a custom tattoo design, and the wrong route when you need ten craft stencils by the weekend. The photo to line art post includes a tracing method that transfers directly to Procreate.

GIMP and Inkscape: free desktop options

GIMP and Inkscape are free, open-source and desktop-only, and between them they cover both halves of the job. GIMP is the raster editor: it has Threshold and Posterize, the same approach as Photoshop with the same broken-line problem on soft photos, plus edge-detection filters that can produce an outline look if you invert and clean them. Inkscape is the vector editor: its bitmap trace turns a black-and-white image into scalable paths, which is exactly what a cutting machine wants and what you need for a stencil printed at poster size without pixelation. Neither runs on an iPhone, and both have interfaces that take an evening to learn. The realistic free workflow is a two-step: get a clean black-on-white image from any source, including a phone app export, then trace it in Inkscape and send the SVG to the cutter.

GIMP

Best when you already own a computer, want the threshold method and refuse to pay. Use it with a photo that has hard, even light, because that is the only kind of photo threshold handles well.

Inkscape

Best as the second stage: import clean line art, run the trace, simplify the path, add bridges by drawing white rectangles across islands, and export an SVG. It is a poor first stage on a raw photo, for the same reason Design Space is.

Online photo-to-stencil converters

Browser-based converters exist as a category: you upload a photo, pick a threshold or an effect, and download a black-and-white image. They run on any device with a browser, including an iPhone, need no install, and pricing across the category runs from free with limits to a subscription for full resolution or no watermark. The trade-offs are consistent across the category. Most are threshold filters with a preset, so the output has the same broken-line problem as Photoshop with less control over the fix. Resolution on a free tier is often too low to print at tattoo or wall size. And you are uploading your photo, or your client's, to a service whose handling of it you may not be able to check; that matters more for a face than for a pumpkin. Use them for a one-off, low-stakes conversion, and check the output size before you rely on it.

Cricut Design Space and Silhouette Studio

If you own a cutting machine, the last stop is always the machine's own software: Cricut Design Space for Cricut machines, Silhouette Studio for Silhouette machines. Both are free base software with optional paid tiers, both trace a black-and-white image into a cut path, and both can size the design and send it to the blade. Neither is a good converter for a raw photo, for the same contrast reason as any threshold tool; give them clean line art and they behave. Design Space runs on desktop and on iPhone, so an iPhone-only workflow is possible: convert the photo in Stencil AI, export a transparent PNG, upload it in Design Space, trace, cut. Silhouette Studio is desktop software. The Cricut stencil from a photo post covers the trace, the bridges-or-vinyl decision, materials and cut settings in order.

Which stencil maker should you choose?

Choose by the constraint you cannot change. If you only have an iPhone, the practical options are an AI stencil app or an online converter, and the app produces outlines rather than thresholded pixels; the photo to stencil page shows what to expect. If the stencil is a tattoo design you will sell, do the conversion in the app or Photoshop for the base and finish it by hand, in Procreate or in the app's Touch Up tool; the tattoo stencil maker page covers that workflow. If you refuse to pay anything and own a computer, GIMP then Inkscape. If you own a cutting machine, use whatever produces the cleanest black-on-white image, then the machine software. And if you need to print at home afterwards, the print a stencil at home guide covers size and paper for every route above.