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RK DevTools

Web Dev Workspace Tools

A privacy-first suite of offline-capable developer utilities. No logins, no tracking. Everything executes right in your browser.

Greatest Hits

QR Generator

Generate clean, customizable QR codes instantly offline.

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Contrast Checker

Check WCAG accessibility contrast ratio for text & background colors.

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PX to REM Converter

Convert pixels to REM units dynamically for responsive CSS design.

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Tailwind Shade Generator

Generate a complete 50-950 Tailwind color scale from any custom hex base.

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Substrata

Clean, distraction-free markdown writing and text styling workspace.

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Palette Generator

Generate beautiful cohesive color palettes and export them.

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Background Remover

Automatically remove backgrounds from images locally.

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Colour

Colour Blindness Simulator

Simulate how designs appear to users with Deuteranopia, Protanopia, and Tritanopia.

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Colour Converter

Convert color formats between Hex, RGB, HSL, HSV, and CMYK.

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Gradient Generator

Design beautiful CSS gradients and copy ready-to-use style values.

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Harmony Generator

Calculate complementary, split-complementary, triadic, and analogous color harmonies.

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Palette Collection

Browse beautiful curated color combinations for UI design.

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Palette Extractor

Extract prominent color palettes from dropped or uploaded image files.

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Pixel Picker

Upload an image and pick precise RGB/Hex color codes pixel-by-pixel.

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Images & Assets

Matte Generator

Add clean, stylish framing borders and mattes to any image.

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Seamless Scroll Generator

Generate panoramic scroll grids for social grids.

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Social Media Cropper

Crop and adjust images to fit exact social profile and post aspect ratios.

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Watermarker

Protect assets by applying text or logo watermarks over images.

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Artwork Enhancer

Quick adjust parameters, dimensions, and visual contrast for artwork uploads.

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Base64 Image Encoder

Encode PNG, SVG, or JPEG files directly into Base64 DataURLs.

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Favicon Generator

Convert files into standard Favicon packages with multi-size configs.

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Image Clipper

Clip images using geometric shapes or custom paths.

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Image Converter

Convert files offline between PNG, WEBP, JPEG, AVIF, and SVG formats.

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Image Splitter

Slice images into vertical or horizontal tile segments.

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Image Stitcher

Merge multiple files side-by-side or stacked top-to-bottom.

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Image Tracer

Vectorize black-and-white raster files into clean SVG path code.

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Paste Image

Paste directly from clipboard to analyze dimensions, file size, or export.

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Placeholder Generator

Create quick placeholder images with customized sizes, colors, and text.

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SVG Optimiser

Clean up junk tags, inline styles, and metadata from raw SVG files.

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Typography & Text

Document Converter

Convert offline documents between Markdown, HTML, RTF, and plain text.

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Font File Explorer

Load custom font files to inspect styling tables, weights, and rendering.

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Glyph Browser

Inspect character codes, Unicode properties, and glyph representations of a loaded font.

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Large Type

Type or paste text to display it in high-contrast full-screen typography.

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Line Height Calculator

Obtain balanced line heights and layout ratios for optimal readability.

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Paper Sizes

Look up standard paper dimensions in mm, cm, inches, and pixels.

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Text Diff

Highlight modifications, insertions, and deletions between two chunks of text.

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Text Editor

Write raw text files in a browser interface with automatic caching.

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Typography Calculator

Compute type scales based on musical proportions (Golden Ratio, Perfect Fourth).

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Word Counter

Calculate words, sentences, reading time, and character metrics instantly.

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Print & Production

PDF Preflight

Verify document dimensions, font embeds, and color spaces for print prep.

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Print Imposer

Re-organize pages onto print-sheet spreads ready for folding.

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Zine Imposer

Impose an 8-page or 16-page pocket zine onto a single sheet of paper.

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Math & Calculations

Algebra Calculator

Input algebraic equations and evaluate variables client-side.

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Base Converter

Convert numeric strings across base 2, 8, 10, 16, and base 36 systems.

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Graph Calculator

Graph functions on a coordinate grid dynamically using JS math engines.

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Scientific Calculator

Standard web calculator for exponential, logarithmic, and trigonometric functions.

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Time Calculator

Add/subtract hours, calculate duration, and compare global time differences.

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Unit Converter

Instantly switch metric and imperial values for length, weight, and volume.

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Developer Tools

Barcode Generator

Generate scannable UPC-A, EAN-13, and Code 128 barcodes.

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Cipher Decoder

Decode ROT13, Caesar, and Base64 cipher values without network queries.

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Meta Tag Generator

Formulate complete SEO, Facebook OpenGraph, and Twitter card meta tags.

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Regex Tester

Test regular expression matches, capture groups, and substitutions in real-time.

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Tailwind Cheat Sheet

Quick reference card layout for spacing, flexbox, grid, and borders.

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Text Scratchpad

A fast local text editor that saves automatically to browser storage.

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Shavian Transliterator

Convert standard English text into Shavian phonetic script symbols.

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Invoice Generator

Fill out a client-side invoice with a live preview and export it to PDF.

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