Essential developer tools for everyday coding tasks

Validate HTML snippets for ARIA misuse: invalid attributes, malformed ID references, and role-label mismatches.

Encode and decode Base64 strings to safely move text and binary content through text-only systems.

Encode and decode Base64URL strings for URLs, JWTs, and token-safe transport without padding or special characters.

Generate CSS box-shadow strings with live preview. Adjust offsets, blur, spread, color, opacity, and inset for copy-ready output.

Convert text between camelCase, PascalCase, snake_case, kebab-case, and UPPER_SNAKE_CASE with readable word splitting.

Check text and background color contrast with WCAG AA and AAA pass/fail for normal and large text.

Convert colors between HEX, RGB, HSL, and HSV with instant previews for design and frontend workflows.

Compute CRC32 checksums from text for error detection, ETags, and integrity verification.

Parse cron expressions into human-readable schedules and preview upcoming run times before deployment.

Generate CSS linear and radial gradients with color stops, angle, and direction controls for design and frontend workflows.

Convert between CSV and JSON for data import, export, and API integration workflows.

Parse data URLs to extract media type, charset, and decoded content. Inspect base64 and URL-encoded data inline.

Compare two text blocks line by line to spot additions, removals, and edits during reviews.

Inspect CSS for :focus/:focus-visible declarations and flag patterns that remove outlines without visible replacement.

Detect form controls missing associated labels, duplicate IDs, and unlabeled buttons in pasted HTML.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text with browser-local processing.

Detect heading level jumps, multiple h1, and missing h1 in pasted HTML for accessibility audits.

Generate HMAC signatures for messages and secrets using SHA-1, SHA-256, SHA-384, or SHA-512.

Encode special characters to HTML entities and decode named or numeric entities back to plain text.

Parse raw HTTP request or response headers into a structured view. Inspect headers and copy formatted output.

Search and browse HTTP status codes by category with quick lookup by code or phrase.

Parse img tags from HTML and flag missing, empty, or suspicious alt text with summary counts.

Convert between INI config files and JSON for settings migration and API integration.

Format, validate, and minify JSON with clear error feedback for API and configuration workflows.

Convert between JSON and YAML formats with validation and error feedback for config and API workflows.

Decode JWT tokens to inspect header and payload claims while debugging authentication flows.

Detect presence and duplicates of common landmarks (header, nav, main, footer, aside) and ARIA landmark roles.

Flag generic link text, empty links, and duplicate link names pointing to different URLs in pasted HTML.

Preview and analyze Markdown with live rendering, formatting tools, and document statistics.

Generate color palettes from a base color with deterministic shades and tints for design systems and CSS.

Check password strength with heuristic feedback on length, character variety, and common patterns.

Heuristic flags for long sentences, passive wording, jargon hits, and plain-language suggestions.

Parse and build URL query strings with key-value pairs. Add, edit, remove params and copy the result.

Compute readability metrics including Flesch Reading Ease and approximate grade level from pasted text.

Escape special regex characters in a string so it matches literally in regular expressions.

Test regular expressions with live match results, capture groups, and flag-aware debugging output.

Compare two semantic version strings and determine which is newer, older, or equal.

Inspect HTML for skip link patterns (href="#main" etc.) and verify target presence.

Generate URL-friendly slugs from text with lowercase, hyphenation, and optional diacritic removal.

Preview, validate, and optimize SVG markup with live rendering for frontend and design workflows.

Check caption presence, th usage, and scope/header associations in pasted HTML tables.

Escape and unescape text for JSON, JavaScript, regex, and newline contexts with context-specific rules.

Evaluate CSS declarations against WCAG 1.4.12 text spacing minimums for line height, paragraph, letter, and word spacing.

Convert Unix timestamps and human-readable dates with support for seconds and milliseconds.

Encode and decode URL percent-encoded strings for query parameters and safe transport in links.

Parse URLs into protocol, host, path, query params, and hash with an editable view to rebuild and copy.

Generate UUID v4 identifiers and validate UUID strings locally in your browser.

Format, validate, and minify XML for config files, feeds, and API payloads.