🎨 Colour, Images & Files

9 browser-local tools · page 1 of 1

Colour, Images & Files. The visual shelf: a WCAG contrast checker with AA and AAA verdicts plus the nearest accessible colour, tints and shades, a canvas design studio with layers and snapping, image compression and format conversion between PNG, JPEG, WebP, BMP and ICO, print sizes at a chosen DPI, screen pixel-density comparison and PDF tools that merge, split, rotate, extract and re-save pages.

9 tools on this shelf · 9 listed below

🎨Colour & Contrast CheckerWCAG contrast ratio between any two colours with AA/AAA verdicts, the nearest accessible colour, and tints & shades palettes. 🖼️Image CompressorShrink a photo or screenshot right in your browser — resize, pick quality, compare before/after and download. Your file never uploads anywhere. 📄PDF ToolsMerge, extract, delete, rotate and split PDF pages without uploading the file — the document is opened and re-saved by your own browser. 🔄Image ConverterConvert between PNG, JPEG, WebP, BMP and ICO, and rasterise an SVG — resize, pick a quality, keep or replace transparency, download. The file never leaves your browser. 🖼️Images to PDFPut photos, scans or screenshots into one PDF — A4, US Letter or a page sized to each image — without uploading. JPEG and PNG files are embedded byte-for-byte, untouched. 📐Aspect Ratio CalculatorTurn 1920×1080 into 16:9, check what a crop actually is, and resize to fit any box with the rounding error printed. 🖨Print Size Calculator3000×2000 prints 10×6.7 inches at 300 dpi — plus the honest physics of how big you can actually go before the dots show. 🎨Design StudioThe poster maker without the login wall: eight starter templates, real layer editing with drag handles, rotation, snapping, one-click alignment, lock and flip, undo history, autosave and PNG/JPG/WebP export up to 4×. 📱Screen & PPIPut any two screens side by side and get real width, height and pixel density — plus the area comparison a diagonal-inches number is designed to hide.

How these tools work

The important property is that the file never leaves your machine. A photo, a scan of a document, a passport picture or an invoice is opened by your browser through the File API and re-saved by it, so there is no upload to wait for, no size limit, no privacy decision to make and no service that can lose the file afterwards. The maths behind each answer — relative luminance, resampling, JPEG quality — is named on the page.

Part of Everyday Tools — 9 of 1136 tools sit here. Other shelves: City-to-city Distances, Coordinates & Position, Antipodes, Numbers & Maths, Money, Rates & Shopping, Health, Body & Fitness, Date & Time, Developer & Data Tools, Text, Words & Writing, Study & Learning, Colour, Images & Files, Everyday Tools. Looking for something specific? Search the whole toolbox.