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Developer Tools 79
- Meta Tag Previewer (Google & Twitter), Preview how your page appears in Google and social cards.
- Cron Expression Parser & Explainer, Decode any cron schedule into plain English.
- HTML/CSS Color Picker & Contrast Checker, Pick colors and verify WCAG contrast ratios.
- CSS Box-Shadow Generator, Design CSS box shadows with live preview.
- CSS Border-Radius Visualizer, Craft wobbly and organic border radii visually.
- Regex Tester & Visual Matcher, Test and visualize regular expressions live.
- PEM Certificate & RSA Key Decoder, Inspect certs and keys without leaving the browser.
- IP Address Lookup & Network Detail, Analyze an IP address or CIDR range.
- DNS Lookup & Propagation Checker, Resolve DNS records for any host.
- SSL Certificate Expiration Checker, How many days until a cert expires?
- HTTP Headers Inspection Tool, See the response headers any URL returns.
- Password Entropy Meter & Brute-Force Estimator, Just how strong is that password?
- Internet Speed Test & Ping Checker, Check your ping and measure internet latency in your browser.
- Scroll Speed Test, Auto-scroll any page and measure scroll speed.
- HTML to Markdown Converter, Convert HTML tags into clean Markdown syntax.
- Markdown to HTML Converter, Compile Markdown into production-ready HTML.
- CSS Minifier, Shrink stylesheets by stripping whitespace.
- CSS Beautifier / Formatter, Indent and clean up messy CSS.
- JavaScript Minifier, Compress scripts to speed up page loads.
- JavaScript Beautifier, Restructure unformatted JS into readable style.
- JSON Validator & Linter, Check syntax and flag broken brackets or commas.
- XML-to-JSON Converter, Transform legacy XML structures into JSON.
- YAML-to-JSON Converter, Convert configuration syntax instantly.
- SQL Query Formatter, Clean up messy database queries.
- SQL Insert to CSV Exporter, Turn SQL INSERT statements into CSV tables.
- HTAccess Redirect Generator, Write clean 301/302 rewrite rules.
- Robots.txt Generator, Build search-engine crawl rules blocks.
- Sitemap XML Structure Builder, Generate sitemap.xml templates for your site.
- Meta Description Length Checker, Measure snippet pixel width and character count.
- Placeholder Image Generator, Make /600x400 placeholder boxes for wireframes.
- CSS Triangle Generator, Border-code speech bubbles and arrows.
- CSS Flexbox Playground & Generator, Experiment with flexbox alignments visually.
- JSON Tree Visualizer, Render nested JSON as an expandable tree.
- Browser User-Agent Inspector, See the live browser string and OS of the visitor.
- Screen Resolution & Viewport Tester, Live window dimensions and aspect ratio.
- JSON to YAML Converter, JSON to clean YAML.
- XML Beautifier / Formatter, Pretty-print XML.
- YAML Validator / Formatter, Check and clean YAML.
- TOML to JSON Converter, Config format conversion.
- INI to JSON Converter, Legacy config conversion.
- .env Parser & Validator, Inspect environment files.
- SQL WHERE Clause Builder, Build conditions visually.
- Code Screenshot Generator, Styled code images.
- JSON Path Extractor, Pull values by JSONPath.
- JSON Schema Generator, Infer schema from JSON.
- JSON to TypeScript Interface, Types from JSON.
- JSON to Go Struct, Go structs from JSON.
- JSON to Python Dataclass, Python classes from JSON.
- JSON to SQL Insert, JSON arrays to INSERT statements.
- HTML Table to CSV, Scrape table to CSV.
- HTML Table to Markdown, Table to Markdown.
- HTML to JSX Converter, Convert HTML attributes to JSX.
- CRC32 Checksum Calculator, File/text checksum.
- Data URI Generator, Text or file to data URI.
- SVG to Data URI, Inline SVG as CSS background.
- Manifest.json Generator, PWA manifest builder.
- CSS Gradient Generator, Linear/radial gradients visually.
- CSS Clip-Path Generator, Shape clipping preview.
- CSS Grid Generator, Build grid layouts.
- CSS Filter Generator, Blur, brightness, contrast, etc.
- CSS Cubic-Bezier Generator, Animation easing curves.
- CSS Text-Shadow Generator, Layered text shadows.
- CSS Animation Keyframes Generator, Starter keyframes.
- Font Pairing Previewer, Compare heading/body fonts.
- Line Height & Typography Scale Calculator, Type scale.
- Gradient Text Generator, CSS gradient text generator.
- PDF Page Counter, Count PDF pages.
- PDF to Text, Extract text from PDF.
- UTM Builder – Free Google Campaign URL Generator, Free UTM Builder - Create Campaign URLs Without Uploading Your Data
- Query String Parser & Editor, Edit URL parameters.
- URL Parser & Component Extractor, Protocol, host, path, query.
- Open Graph Tag Generator, Social meta tags.
- Schema.org JSON-LD Generator, Structured data.
- Hreflang Tag Generator, Multilingual SEO tags.
- RSS Feed Builder, Simple feed XML.
- MIME Type Lookup, Extension to MIME type.
- HTTP Status Code Lookup, Status code meanings.
- LLM API Cost Calculator, Compare monthly API costs across OpenAI, Anthropic, Gemini, and DeepSeek.
- Subnet Cheat Sheet, Look up subnet masks, hosts, and ranges in one quick table.