Digital Photography & Editing

Calculate diagonal angle-of-view focal-length equivalence from actual focal length and exact source/reference image-area width and height.

Calculate thin-lens near/far focus limits and hyperfocal distance from actual focal length, focus distance, f-number, and an entered CoC criterion.

Calculate EV100 and ISO-normalized setting indexes plus an equal-exposure shutter time from aperture, seconds, ISO, and comparison aperture.

Translate a documented or tested flash guide number to a target ISO, then solve a nominal direct-flash f-number or same-unit distance.

Calculate thin-lens hyperfocal distance and its exact entered-criterion near limit from actual focal length, taking f-number, and explicit circle of confusion.

Calculate the largest whole-pixel golden-ratio candidate rectangle inside a source image, including exact edge exclusions and retained pixels.

Calculate print size at entered image PPI, then audit retained pixels, fill crop, effective PPI, and pixel differences for one exact target.

Professional color picker with HEX, RGB, and HSL conversion, WCAG contrast checking, and palette generation. Pick colors and copy CSS-ready values instantly.

Calculate whole-pixel image dimensions with a locked ratio or independent width and height, then compare scale and pixel area before exporting in an editor.

Generate scan-testable URL, email, phone, WiFi, or escaped vCard QR codes with UTF-8 capacity checks, color warnings, raster logos, PNG, and SVG.

Simple in-browser notepad with auto-save. Write quick notes that persist in your browser. Download as text file. No signup needed.

Compare two observed offers on one explicit shared denominator, with auditable unit prices, differences, and a true tie state.

Compare subscription and phone plan cash costs, including prepaid bills, promotions, fees, devices and switching costs. Save and restore your draft.