Cut your own SVGs on a VEVOR Smart, E-cut, or Silhouette plotter, straight from your phone.
Android · German & English · no account, no login ·
Share an SVG to Knutcut from any app, place and scale it on the mat, send it to the cutter over Bluetooth. That is the whole app.
The software that ships with these plotters wants a login, ships a broken German translation, and won't take a shared SVG. Knutcut does the part I need, in code I control.
Drop in a PNG, JPG, or BMP and Knutcut traces it to cuttable vector layers on the phone, no desktop software needed. Frame the part you want with the crop box and posterize it into a few colors; each color becomes its own layer. The tracer works in perceptual color space, so even two colors lift the subject off the background instead of muddying into grey.
 Crop to the subject, set the colors |
 A clean cut layer, ready to plot |
 Per-layer color |
 Layers & nesting |
 Plotter picker |
 Bend & transform |
Mat editor. Place, scale, rotate, mirror, and duplicate your design on a true-to-size mat with a mm grid and cm ruler. Pinch to zoom and pan, drag to move, snap to the guides. Undo and redo every step.
Layers. Rename, reorder, show or hide, and recolour each layer. Group by color, merge or split, and tile a layer into an n×m grid to fill the sheet. Auto-arrange packs everything tight to save material, with optional 90° rotation.
Color. Give every layer its own color from the swatch palette or a full HSV picker with hex input, so the design on screen matches the vinyl you cut.
Shapes and text. Draw freehand, drop in shapes, or set text in outline and single-stroke (Hershey) fonts. Convert any shape to editable nodes and bend it by hand.
Open and export. Reads SVGs from any editor, Inkscape, Illustrator, or CorelDraw, whatever the file encoding (CorelDraw's UTF-16 exports included). Open or share SVG and PLT files, then export the whole design back out as a real-size SVG with every layer and color, ready to re-open anywhere.
Trace a photo. Import a PNG, JPG, or BMP and posterize-trace it into colored cut layers. A crop box isolates one object, and perceptual (CIELAB) color clustering separates the subject from the background even at two colors. Tune colors, detail, and speckle removal in a live preview.
Cut. Send to a VEVOR Smart or E-cut over classic Bluetooth, or to a Silhouette over Bluetooth LE. Pick a material preset or set pressure, knife compensation, and the number of passes yourself. Assign pen or knife per layer.
Stays current. Knutcut checks the releases repo on launch and offers the new version, verified by SHA-256 before it installs.
- VEVOR Smart 1 / 2 / 3 / 4 over classic Bluetooth (HPGL)
- E-cut Smart 330, the same hardware as the VEVOR Smart 1
- Silhouette Cameo 3 / 4 / 5 and Portrait 2 / 3 over Bluetooth LE (GPGL)
Don't see yours listed? Tap Search to pair any device, or jump into the Bluetooth settings from the dialog.
- Grab the latest APK from the releases page.
- Open it on your phone and allow the install. It is signed with a stable release key.
- From then on Knutcut updates itself and offers each new release on launch.
Standard Android toolchain (Android SDK and Gradle under tools/, JDK 17).
cd android
./gradlew :app:assembleRelease # installable APK
./gradlew test # unit tests
svgcore: pure Kotlin, no Android. Turns an SVG into mm geometry and then into the plotter command stream (HPGL for VEVOR, GPGL for Silhouette). Unit-tested on the JVM and free of Android dependencies, so it can be reused on its own.app: Compose UI (share target, mat editor, material picker, cut flow) plus the two Bluetooth transports, classic Serial (SPP) for VEVOR and E-cut and Bluetooth LE (GATT) for Silhouette.
See CHANGELOG.md for the per-release history and docs/ for the design and protocol notes.
Personal project for my own hardware, with only my own code. The plotter protocol is reimplemented from watching my own device. No third-party app code or assets are included.
Copyright © 2026 Oliver Köster
Knutcut is free software under the GNU General Public License v3.0. You may use, study, modify, and share it. If you distribute it or a modified version, it has to stay open source under the same GPL-3.0 licence and keep this copyright notice, so credit stays with the author.