Free Developer Tools
Fast, private, no sign-up required. Every tool runs entirely in your browser — no data is sent to any server.
Whether you need to format JSON, generate secure passwords, test regular expressions, decode JWTs, compress images, build schema markup, or check content for plagiarism — we have 40 free utilities built for developers, writers, and SEO professionals. All tools are open, instant, and work offline after loading.
JSON Formatter & Validator
Format, validate, and minify JSON with syntax error detection. Supports 2-space and 4-space indentation.
Password Generator
Generate strong, random passwords with customizable length and character options. Uses Web Crypto API.
Meta Tag Generator
Generate SEO meta tags with live Google and social media previews. Open Graph and Twitter Cards included.
SEO Title Analyzer
Score blog titles for length, intent words, specificity, and click potential. Useful for improving search impressions into clicks.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text. Full UTF-8 support for international characters.
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading time. Includes case conversion tools.
llms.txt Generator & Validator
Create and validate llms.txt files. Check format compliance, detect issues, and help AI models understand your site.
Regex Tester
Test regular expressions with live highlighting, match details, replace mode, and a quick reference cheat sheet.
JWT Decoder
Decode JSON Web Tokens instantly. View header, payload, signature, expiration status, and registered claims.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes using the Web Crypto API. Compare and verify hashes.
UUID Generator
Generate UUID v4 (random) and v1-like (time-based) identifiers. Bulk generation and UUID validation included.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.
URL Encoder & Decoder
Encode or decode URLs with component and full URI modes. Includes a URL parser to break down any URL.
Diff Checker
Compare two texts side by side with line-by-line diff. See additions, deletions, and unchanged lines.
Open Graph Preview
Preview how your links appear on Google, Facebook, LinkedIn, and Twitter/X. Generate Open Graph and Twitter Card meta tags.
robots.txt Generator
Build robots.txt files visually with user-agent groups, allow/disallow rules, sitemaps, and crawl delays.
Schema Markup Generator
Generate JSON-LD structured data for Article, FAQ, HowTo, Product, LocalBusiness, Breadcrumb, and more.
Slug Generator
Convert any text into a clean, URL-friendly slug. Handles accented characters, special symbols, and unicode.
CSS Gradient Generator
Create beautiful linear and radial CSS gradients with multiple color stops, angle controls, and presets.
Color Converter
Convert colors between HEX, RGB, and HSL formats. Visual color picker with sliders and live preview.
Box Shadow Generator
Build CSS box-shadow effects visually. Stack multiple layers, adjust blur, spread, color, and opacity.
AI Content Detector
Detect AI-generated text using 8 linguistic signals. Check if content was written by ChatGPT, Claude, or other AI models.
Plagiarism Checker
Check text uniqueness and compare documents for plagiarism. Uses n-gram analysis, cosine similarity, and sentence matching.
Live HTML Editor
Write HTML, CSS, and JavaScript with instant live preview. 7 templates, split layouts, mobile preview, and fullscreen mode.
HTML Tag Generator & Remover
Add HTML tags to plain text or strip all tags from HTML. Supports paragraphs, headings, lists, links, bold, and custom tags.
Plagiarism Remover & AI Humanizer
Rewrite text to remove plagiarism and humanize AI-generated content. Replaces AI phrases, swaps synonyms, and adds contractions.
Code Formatter & Beautifier
Format, beautify, and minify code instantly. Supports JSON, HTML, CSS, JavaScript, SQL, and XML.
YouTube Tag Generator
Generate optimized YouTube tags instantly. Enter your video title or keyword and get SEO-friendly tags to boost rankings.
Text to Speech Converter
Convert text to speech online for free. Choose from 100+ voices, adjust speed, pitch, and volume. Runs entirely in your browser.
QR Code Generator
Generate custom QR codes for URLs, text, WiFi, email, and more. Choose colors, size, and error correction level. Download as PNG or SVG.
Image Compressor
Compress, resize, and convert JPG, PNG, and WebP images in your browser. Preview savings and download optimized files.
Cron Expression Generator
Build cron expressions visually for crontab schedules. Generate every-minute, daily, weekly, monthly, and custom cron syntax.
AI Prompt Generator
Build better prompts for ChatGPT, Claude, Gemini, coding assistants, marketing copy, and image generation with goals, tone, context, and constraints.
AI CV Builder
Create a modern CV online with visual and code modes, AI writing help, profile image upload, templates, customization, and PDF download.
Lorem Ipsum Generator
Generate placeholder text for designs and layouts. Choose paragraphs, sentences, or words with customizable count and HTML wrapping.
Markdown to HTML Converter
Convert Markdown to clean, semantic HTML instantly. Supports headings, bold, italic, code blocks, links, images, lists, and blockquotes.
JSON to CSV Converter
Convert JSON arrays to CSV or TSV format. Supports nested objects, custom delimiters, file upload, and download.
Privacy Policy Generator
Generate a customized privacy policy for your website or app. Covers cookies, analytics, GDPR basics, and more. Download as Markdown.
JSON to TypeScript Converter
Generate TypeScript interfaces or types from JSON data. Supports nested objects, arrays, optional props, and export declarations.
CSS Flexbox Generator
Build Flexbox layouts visually with live preview. Set direction, alignment, wrapping, and gap. Copy production-ready CSS instantly.