Free Developer Tools for Every Project

Check HTTP status codes for up to 1,000 URLs at once. Identify 404 errors, server issues, and redirect chains. Export results to CSV for easy tracking and fixing broken links.

Execute up to 50 curl commands simultaneously with custom headers, authentication, and methods. Ideal for API testing, load testing, and bulk HTTP operations with configurable concurrency.

Validate image URLs in bulk to find broken images before they hurt user experience. Check 100+ image links at once, verify CDN delivery, and identify missing or inaccessible media assets.

Extract all URLs from any text, HTML, or webpage content. Filter links by domain, pattern, or type. Perfect for content audits, competitor analysis, and building URL lists for further testing.

Comprehensive on-page SEO analysis covering 30+ ranking factors. Check meta tags, heading structure, keyword density, Open Graph tags, and get actionable optimization recommendations.

Test Core Web Vitals (LCP, FID, CLS) that directly impact Google rankings. Measure TTFB, FCP, and get performance scores with specific recommendations to improve page load speed.

Trace complete redirect chains to identify 301/302 redirects, redirect loops, and excessive hops that slow down crawling. Essential for site migrations and fixing redirect issues.

Crawl any webpage to discover broken internal and external links. Find 404 errors, timeout issues, and dead links that hurt SEO and user experience. Export results for easy fixing.

Test URLs against robots.txt rules to verify crawl permissions. Check if Googlebot and other crawlers can access your pages. Identify blocking rules that may prevent indexing.

Validate XML sitemaps against schema standards. Extract and analyze all URLs, check lastmod dates, and identify issues before submitting to Google Search Console.

Verify SSL/TLS certificate validity, check expiration dates, view the full certificate chain, and identify issuer details. Get alerts for certificates expiring soon to prevent security warnings.

Analyze HTTP security headers against OWASP recommendations. Check CSP, HSTS, X-Frame-Options, X-Content-Type-Options, and more. Get a security grade and specific recommendations to harden your site.

Test CORS configuration by sending preflight OPTIONS requests from custom origins. Verify Access-Control headers, allowed methods, and credentials support. Debug cross-origin issues in APIs.

Query all DNS record types: A, AAAA, MX, TXT, NS, CNAME, SOA. Check SPF and DKIM records for email authentication. Verify DNS propagation and troubleshoot resolution issues.

Get complete domain registration information: registrar, creation/expiry dates, nameservers, and registrant contacts. Check domain availability and research domain history for purchases.

Compare stored procedures between production and staging databases with side-by-side diff view. Identify code differences, missing procedures, and changes before deployment. Supports MySQL, PostgreSQL, SQL Server.

Compare table structures between databases: columns, data types, indexes, constraints, and foreign keys. Generate ALTER scripts for schema migrations. Essential for database version control.

Convert plain English questions to SQL queries using AI. Describe what data you need and get accurate SELECT, JOIN, GROUP BY queries. Connect to your database to execute instantly.

Test REST APIs with all HTTP methods (GET, POST, PUT, DELETE, PATCH). Add custom headers, authentication, and JSON body. View response headers, timing, and formatted JSON. Test up to 20 endpoints in batch mode.

Format, validate, and beautify JSON with syntax highlighting. Minify for production or pretty-print for debugging. View as collapsible tree structure. Validates JSON syntax and shows error locations.

Encode text or files to Base64, decode Base64 back to original. Supports URL-safe encoding, image files to data URIs, and handles binary data. Perfect for embedding assets or API payloads.

Decode JWT tokens to inspect header, payload, and claims without verification. Check expiration dates, issuer, audience, and custom claims. Essential for debugging OAuth and authentication flows.

Generate cryptographic hashes: MD5, SHA-1, SHA-256, SHA-384, SHA-512. Hash text input or upload files for checksum verification. Compare hashes to verify file integrity after downloads.

Generate random UUIDs (v4) or time-based UUIDs (v1). Generate single IDs or bulk batches up to 1000. Output in standard, uppercase, or hyphen-free format. Copy to clipboard with one click.

Compare two texts or code snippets with line-by-line diff highlighting. View in side-by-side or inline mode. Shows additions, deletions, and modifications. Perfect for code reviews and config changes.

Test regular expressions with real-time match highlighting. See capture groups, test flags (g, i, m, s), and get match details. Supports JavaScript and PCRE syntax with explanation of patterns.

Format and beautify SQL queries with proper indentation and keyword casing. Supports MySQL, PostgreSQL, SQL Server, and Oracle dialects. Makes complex queries readable and maintainable.

Minify HTML, CSS, and JavaScript for production to reduce file sizes. Or beautify minified code for debugging. Shows compression ratio and before/after sizes. Client-side processing for privacy.

Convert colors between HEX, RGB, RGBA, HSL, and HSV formats instantly. Visual color picker included. Copy CSS-ready values. Check contrast ratios for accessibility compliance (WCAG).

Parse and validate cron expressions with human-readable explanations. See the next 10 scheduled execution times. Build cron expressions with a visual editor. Supports standard and extended cron syntax.

Convert Unix timestamps (seconds or milliseconds) to human-readable dates and vice versa. Shows current timestamp, supports timezone conversion, and outputs in multiple formats including ISO 8601.

Convert CSV data to JSON array and back. Handles headers, custom delimiters, and quoted values. Perfect for transforming spreadsheet exports for API consumption or vice versa. Preview and download results.

Generate realistic fake data for testing: names, emails, phone numbers, addresses, credit cards, dates, and more. Create custom schemas with multiple rows. Export as JSON, CSV, or SQL INSERT statements.