100% ब्राउज़र में और सुरक्षित

Web Color Contrast Checker (WCAG 2.1 AA & AAA Conformance)

Client-Side Sandbox
100% In-Browser Privacy All computations and file processing run strictly in your browser. Zero server data uploads.

Test text and background color combinations against W3C WCAG accessibility standards for normal text, large text, and UI components.

WCAG 2.1 AA & AAA Contrast Conformance

Test text and background color combinations against W3C WCAG accessibility standards for normal text, large text, and user interface components.

Large Headline Preview (18pt+)
This is sample body text (14pt-16pt) to evaluate visual readability and legibility against the chosen background color.
Contrast Ratio 16.1 : 1
WCAG AA Normal (4.5:1) PASS
WCAG AAA Normal (7.0:1) PASS
WCAG AA Large / UI (3.0:1) PASS
मानक सत्यापित
सटीक और निश्चित परिणाम विश्वसनीय, पुनरुत्पादक गणना परिणामों के लिए आधिकारिक विनिर्देशों के अनुसार परीक्षण किया गया।

इस टूल का उपयोग कैसे करें

  1. Paste your code, payload, schema, or query into the source editor.
  2. Choose indentation spacing (2 or 4 spaces), formatting flags, or conversion mode.
  3. Inspect syntax validation or decoded output in real time, then click Copy Code or Download.

समर्थित प्रारूप, सीमाएं और गोपनीयता

इनपुट और सीमाएं: Browser client-side processing limits apply (e.g. max recommended image size 25MB).

शून्य डेटा संग्रह: यह उपकरण आपके क्लाइंट ब्राउज़र जावास्क्रिप्ट इंजन के अंदर 100% निष्पादित होता है। कोई भी कीस्ट्रोक्स, मान, फाइलें या परिकलित परिणाम किसी भी रिमोट सर्वर पर संग्रहीत या प्रेषित नहीं होते हैं।

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डेवलपर और वेब में संबंधित टूल्स

JSON Formatter & Validator

Beautify, validate, and minify JSON strings with pinpoint syntax error reporting and clear line/column indications.

Base64 Encoder & Decoder

Encode and decode Base64 data with comprehensive UTF-8 multibyte character support and invalid format validation.

URL Encoder & Decoder

Encode and decode URI components and query strings safely with standards-compliant RFC 3986 percent encoding.

Hash Generator

Generate cryptographic hashes including SHA-256, SHA-1, SHA-384, SHA-512, and MD5 client-side in real time.

HTML Entity Encoder & Decoder

Encode characters to named or numeric HTML entities for web safety, or decode existing entity references.

CSS Formatter & Minifier

Beautify messy CSS stylesheets with consistent indentation or minify CSS rules to reduce transfer payload.

JavaScript Formatter & Minifier

Format, indent, and beautify JavaScript code or compress whitespace and comments safely in your browser.

XML Formatter & Validator

Format, indent, and validate XML documents, sitemaps, RSS feeds, or SVG markup using standard DOMParser.

Regular Expression Tester & Matcher

Test JavaScript regular expressions with real-time match highlighting, group extraction, and flag toggling.

JSON Web Token (JWT) Decoder

Decode JSON Web Tokens (JWT) to inspect header algorithms, payload claims, and expiration timestamps safely.

Cron Expression Helper & Explainer

Build, understand, and translate 5-field cron schedule expressions into plain human-readable descriptions.

Robots.txt Generator & Directives Builder

Create SEO-compliant robots.txt directives for Googlebot, Bingbot, and AI crawlers with sitemap integration.

SQL Query Formatter & Beautifier

Format, indent, and uppercase SQL keywords in MySQL, PostgreSQL, SQLite, and MariaDB queries.

SQL Query Syntax Linter & Safety Validator

Lint SQL syntax, check quote/parentheses balance, and detect dangerous unconstrained UPDATE or DELETE statements.

HTTP Status Codes Reference & Debugging Guide

Comprehensive RFC 9110 HTTP status code reference with explanations, caching rules, and troubleshooting tips.

MIME Type & File Extension Directory

Lookup standard MIME Content-Type headers by file extension or search by Media descriptor for APIs and servers.

Modern HTML5 Starter Boilerplate Generator

Generate production-ready HTML5 starter boilerplate templates configured with modern viewport tags and metadata.

SEO & Social Graph Meta Tag Generator

Generate SEO meta tags, OpenGraph (Facebook/LinkedIn), and Twitter Card markup with live visual search previews.

URL Query String Parameter Parser & Builder

Deconstruct complex URLs into query parameters, edit key-value pairs, and re-encode clean URLs automatically.

Website HTTP Response Headers & Security Inspector

Audit HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy) with private SSRF protections.

YAML Formatter, Validator & JSON Converter

Format YAML snippets, validate syntax indentation, and convert YAML directly to clean JSON client-side.

TOML Formatter & Config Validator

Lint and reformat Tom's Obvious Minimal Language (TOML) configuration files and verify key-value structures.

Markdown Table Generator (GFM Interactive Grid)

Visually design, edit, and align GitHub Flavored Markdown (GFM) tables with live interactive rows and columns.

Open Graph Preview & Social Meta Tag Generator

Preview how URLs look when shared on X, Facebook, LinkedIn, or Discord and generate complete og:tag and Twitter markup.

HTML Accessibility (a11y) Checker (WCAG 2.1 Audit)

Audit HTML snippets for missing alt tags, empty buttons, missing form labels, and ARIA violations in your browser.

Sitemap XML Generator (Google Search Console Ready)

Generate valid, standards-compliant sitemap.xml files with configurable priority, changefreq, and lastmod tags.

HTTP Request Header Builder (cURL & Fetch Exporter)

Construct REST API headers (Authorization, Accept, Content-Type) and export cURL and JavaScript fetch snippets.