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Pick three photos, frame each inside a real instax-mini card — white border and all — and lay them on a print-ready 15×10 cm sheet with cut marks. Print, cut, done.
Everything you need to turn phone photos into instax-mini prints on a standard lab sheet.
Each photo is composited inside a full 54×86 mm card with the classic white border — thin at the top and sides, thick at the bottom — so cut-out prints look like actual instax minis.
Drag to move, mouse-wheel or a slider to zoom, and rotate with 90° buttons or the angle slider. A rule-of-thirds grid helps you compose each shot.
The instax frame is locked to the 46×62 mm ratio and always kept inside the photo — at any rotation — so a crop can never include a white sliver.
Each crop shows its effective print resolution as you zoom. Drop below 180 DPI and it turns red with a low-res warning, so you catch a soft print before you pay for it.
Cards pack edge-to-edge and flush to the top, so you only cut two vertical lines and one bottom trim — the sheet's own edges are the outer borders.
Export a JPEG, PNG, or TIFF with the physical size embedded, or print straight from the app. A lab reproduces it at exactly 15×10 cm with no fiddling.
Photos with accents, ñ, or non-Latin characters in the path load and save correctly on Linux, macOS, and Windows.
The file picker remembers your last folder across all three slots and lists both upper- and lower-case extensions, so a folder of photos never shows up empty.
No projects to manage, no export presets to configure — just load, frame, generate.
One per crop slot. JPEG, PNG, TIFF, BMP, WEBP — the picker remembers your folder so a shoot goes fast.
Drag, zoom, and rotate the instax frame until it covers exactly what you want. Watch the DPI readout stay green.
One click lays the three instax cards on a 4R with cut marks and opens a preview at 15×10 cm.
Save or print at 300 DPI, then make three straight cuts. Each piece is an instax-mini-style print.
Every dimension is defined in mm and rendered at 300 DPI, so the exported file prints at the correct physical size.
| Element | Millimetres | Pixels @ 300 DPI |
|---|---|---|
| 4R sheet (landscape) | 152.4 × 101.6 | 1800 × 1200 |
| instax-mini card | 54 × 86 | 638 × 1016 |
| instax image area | 46 × 62 | 543 × 732 |
| top / side border | 4 | ~47 |
The image area sits inside the card with 4 mm side/top borders and a ~20 mm bottom border — the classic instax look. Three 54 mm cards (162 mm) are a touch wider than the 4R (152 mm), so they print slightly under full size. All layout numbers live in instax_config.py and are easy to tweak.
Python 3.11+, Linux / macOS / Windows. No build step — clone and run.
You'll need Python 3.11+ and Git. On Linux, install the PyQt6 system libs first (see the install doc).
./run.sh creates a local venv, installs PyQt6, OpenCV, Pillow, and NumPy on first run, then launches the app.
The window opens with three empty crop slots. Load a photo into each, frame it, and generate your 4R sheet.
# Clone the repository git clone https://github.com/mnavas/instax-printing.git cd instax-printing # First run creates the venv + installs deps, then launches ./run.sh # …or do it by hand python3 -m venv .venv source .venv/bin/activate # Windows: .venv\Scripts\activate pip install -r requirements.txt python main.py
For Linux system packages (libxcb, etc.), desktop launcher setup, and platform notes see docs/installation.md.
instax-printing is open source and welcomes contributions of any size.
Something crash or print wrong? Open an issue with steps to reproduce and your OS / Python version.
Open an issue →Want other print sizes, more cards per sheet, or a different border? Open a feature request and describe it.
Request a feature →Fork, branch, and send a PR. Read docs/architecture.md first — it explains the module map and the crop maths.
Fork on GitHub →Docs are plain Markdown in the docs/ folder — easy to edit and submit.
instax-printing is built and maintained as a side project. It's free and open source — but development tools, time, and motivation all have a real cost.
If the app saves you money and hassle printing your instax photos, consider chipping in. Every contribution helps keep it maintained and improving.
All contributions go directly to the developer. No company, no VC behind this.
instax-printing is free to use, fork, and modify. No telemetry, no accounts, no cloud — everything runs on your machine.
View on GitHub →Escanea el QR con tu app bancaria para enviar tu aporte.
¡Muchas gracias!