Lexideck Technologies

Free browser tools

Tools

Twenty-three free browser tools for everyday tasks. Convert a file, check your work, build a prompt or explore a colour palette.

The aim is simple: useful tools that respect your privacy, without extra tracking or unnecessary data collection. Browse the categories below and choose what helps with the task at hand.

Converters

CSV ↔ JSONConvert between CSV and JSON in either direction (opens in a new tab) Markdown to HTMLClean HTML out of Markdown source (opens in a new tab) Markdown to LaTeXMarkdown source into LaTeX (opens in a new tab) Epoch time converterUnix timestamps to human dates and back (opens in a new tab) URL encoder and decoderPercent-encoding both ways (opens in a new tab)

Formatters and validators

JSON formatter and validatorPretty-print and validate in one pass (opens in a new tab) Markdown previewerLive render as you type (opens in a new tab) Regex tester and debuggerMatch, group and explain a pattern (opens in a new tab) CSV QACheck a CSV for structural problems before you trust it (opens in a new tab)

Prompt engineering

Lexideck prompt engineerStructured prompt construction on the Lexideck method (opens in a new tab) WYSIWYG prompt editorVisual editing with code blocks preserved (opens in a new tab) WYSIWYG Markdown generatorCompose visually, get Markdown out (opens in a new tab)

Developer utilities

UUID generatorGenerate UUIDs in bulk (opens in a new tab) Color contrast checkerTest a pair against WCAG thresholds (opens in a new tab) CalculatorGeneral-purpose calculator (opens in a new tab) IEG scientific calculatorScientific calculator with the IEG constants (opens in a new tab)

Network

WebSocket testerOpen a socket, send frames, watch the traffic (opens in a new tab) Network latencyMeasure round-trip time from the browser (opens in a new tab)

Visual

Dominant colour finderPull the dominant colours out of an image as a usable palette (opens in a new tab) OKLCH palette generatorBuild perceptually even palettes in OKLCH with gamut warnings (opens in a new tab)

Accessibility

A single-pair contrast checker is under developer utilities. These grids do every pair in a palette at once.

WCAG contrast gridEvery foreground and background pair scored against WCAG 2.1 (opens in a new tab) APCA contrast gridThe same grid scored with APCA, the WCAG 3 candidate (opens in a new tab) Colour vision simulatorSee a palette or image as protan, deutan and tritan vision does (opens in a new tab)
  • Writing
  • Coding
  • Art
  • Research
  • Mathematics
  • Realizability