How We Build & Test Our Tools
Transparent calculations, practical test cases and clearly stated limitations are part of the product—not an afterthought.
Last updated: October 6, 20261. Start with the user’s question
We design tools around a concrete decision: how large an image can print, how many pixels a target size needs, whether a file matches an aspect ratio, or which frame can fit a print. Advanced settings are added only when they help answer that question.
2. Make the calculation transparent
When a result is mathematical, we define the inputs and units and keep the logic reproducible. A print-size calculation, for example, is based on pixel dimensions divided by PPI. Changing only a file’s 72, 96 or 300 PPI metadata does not create additional pixels.
3. Test known and edge cases
Before a calculator is treated as stable, we test known examples and less convenient inputs: matching and mismatched aspect ratios, standard and nonstandard sizes, unit conversions, high and low effective PPI, empty inputs and boundary conditions relevant to the tool.
4. Explain limitations
A calculator can be mathematically correct while a real printing workflow has additional constraints. Printer margins, lab requirements, cropping, frame availability, viewing distance and marketplace rules are explained where they materially affect the result.
5. Protect files when local processing is stated
For tools that explicitly state that an image is processed locally, the selected file is handled in the browser for that function rather than uploaded to a Wall Art Toolkit server. We make this claim only where it matches the implementation. See our Privacy Policy for details.