⭐ Starlight Tools / Web Development Tools

Web Development Tools

Free browser-based web dev utilities for HTML/CSS/JS, JSON/YAML, Base64, JWT, regex, gradients, and favicons—everything runs locally for privacy. Try our JSON Formatter, HTML Minify/Beautify, CSS Gradient Generator, or Regex Tester.

Web HTML color picker showing palette swatches and Hex RGB HSL values

HTML Colour Picker

Pick a colour from a palette and get its Hex, RGB, and HSL codes. v1.0

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Web Markdown to HTML converter with split pane input and rendered output

Markdown→HTML Converter

Convert Markdown text to HTML instantly. v1.0

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Web Base64 encoder decoder showing text input and encoded output panels

Base64 Encoder/Decoder

Encode and decode text to and from Base64. v1.0

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Web Image to Base64 converter uploading an image and showing encoded string output

Image→Base64 Converter

Convert any image to a Base64 string in your browser. Copy or download instantly. v1.0

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Web JSON formatter and validator showing pretty printed JSON and validation status

JSON Formatter & Validator

Pretty-print, minify, and validate JSON data instantly in your browser. v1.0

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Web URL encoder decoder converting special characters to percent encoding

URL Encoder/Decoder

Encode or decode special characters in URLs. v1.0

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Web Hash generator producing MD5 SHA1 SHA256 checksums from text input

Hash Generator

Generate MD5, SHA1, and SHA256 hashes of text strings. v1.0

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Web Password strength checker showing entropy crack time and PBKDF2 timing

Password Strength Checker

Estimate strength, entropy & crack time with optional PBKDF2 timing — 100% client-side and private. v1.0

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Web Markdown table generator selecting rows and columns to produce table markup

Markdown Table Generator

Visually create blank Markdown tables by selecting rows and columns. v1.0

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Web Regex tester highlighting matches in sample text with live expression input

Regex Tester

Test and build regular expressions against sample text with live highlighting. v1.0

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Web Browser info tool displaying IP user agent screen size and device details

Browser Info Tool

Show IP, browser type, screen size, and user agent for debugging. v1.0

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Web Meta tag generator form for SEO Open Graph and Twitter tags with live preview

Meta Tag Generator

Create SEO, Open Graph, and Twitter meta tags with live preview. Copy or download a ready-to-use head block. v1.0

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Web Robots.txt builder creating user agent allow disallow rules sitemap and crawl delay

Robots.txt Builder

Create user-agent groups with Allow/Disallow rules, add Sitemap URLs, and optional crawl-delay/Host — 100% client-side. v1.0

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Web CSS gradient generator with linear radial options color stops and copyable CSS

CSS Gradient Generator

Create linear or radial gradients with multiple color stops, live preview, and one-click CSS copy. v1.0.1

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Web Favicon pack generator exporting multiple icon sizes PNG favicon ico manifest and tags

Favicon Pack Generator

Create PNGs (16–512), favicon.ico, manifest & tags — all client-side. Download as a ZIP. v1.0

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Web HTML minifier and beautifier showing compacted and formatted HTML outputs

HTML Minifier & Beautifier

Minify HTML for compact size or beautify for readability — all client-side for privacy. v1.0

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Web JavaScript minifier and beautifier with code input and formatted output

JavaScript Minifier & Beautifier

Minify JS for faster load times or beautify for readability—100% client-side and private. v1.0

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Web YAML to JSON converter with YAML input pane and JSON output preview

YAML to JSON Converter

Paste YAML and get clean JSON instantly — 100% client-side and private. v1.0

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Web JSON to YAML converter with JSON input pane and YAML output preview

JSON to YAML Converter

Paste JSON and get clean YAML instantly — 100% client-side and private. v1.0

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Web JWT Encoder preview

JWT Encoder

Create and sign JWTs (none, HS256, RS256). Add iat/nbf/exp with one click. 100% client-side. v1.0.0

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Web JWT decoder showing header payload signature and verification status

JWT Decoder

Decode JWT header & payload, inspect time claims, and verify HS256/RS256 locally. 100% client-side. v1.0.0

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Web Lorem ipsum generator creating placeholder text by words sentences or paragraphs with copy options

Lorem Ipsum Generator

Generate filler text by words, sentences, or paragraphs. Copy as plain text, HTML <p>, or Markdown — all client-side. v1.0

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About These Web Dev Tools

These web development utilities run entirely in your browser—no uploads or sign-ups—covering HTML/CSS/JS formatting, JSON/YAML conversion, Base64/JWT, regex testing, gradients, and favicons.

Popular picks include the JSON Formatter, HTML Minify/Beautify, CSS Gradient Generator, and Regex Tester. Use them free anytime.