60 Free Developer Tools
Built for developers, students, and AI engineers. No login, no ads — just instant results. Paste JSON from ChatGPT, decode a JWT from a bug report, or format SQL from Copilot, most tools running entirely in your browser.
Open source on GitHubTools
60 of 60AI Code Explainer
Paste any code snippet and get a plain-English explanation instantly, powered by AI. Free tool for understanding unfamiliar code in any language.
AI Error Message Explainer
Paste any error message or stack trace and get a plain-English diagnosis with a suggested fix, powered by AI. Free, no sign-up.
AI Text-to-SQL Generator
Describe the query you need in plain English and get a ready-to-use SQL statement, powered by AI. Free tool with dialect support.
Base64 Encoder / Decoder
Encode or decode Base64 text and files instantly online. Free Base64 converter for JWTs, data URLs, and auth headers — everything runs in your browser.
Bcrypt Generator
Generate and verify bcrypt password hashes online with a configurable cost factor. Free bcrypt tool — runs entirely in your browser with bcryptjs.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case, and more, instantly online. Free tool for renaming variables and API fields.
chmod Calculator
Calculate Unix file permissions visually and get octal, symbolic, and chmod command output. Free chmod calculator with common presets (644, 755, and more).
Color Contrast Checker
Check WCAG contrast ratio between any two colors online, instantly. Free accessibility checker showing Pass/Fail for WCAG AA and AAA levels.
Color Converter
Convert colors between HEX, RGB, and HSL instantly online with a live preview. Free color converter for CSS, Figma, and Tailwind workflows.
Cron Expression Parser
Decode any cron expression into plain English online, instantly. Free cron parser that shows the next scheduled run times — no more guessing.
CSS Formatter
Format and beautify minified or messy CSS online, instantly. Free CSS formatter with clean, consistent indentation for every rule and property.
CSS Gradient Generator
Create beautiful CSS gradients visually — linear, radial, and conic — with live preview and copy-ready CSS. Free online CSS gradient generator.
CSV to JSON
Convert CSV data or spreadsheet files to a JSON array instantly online, for free. Perfect for importing data into APIs and databases — no sign-up.
cURL to Fetch
Convert a cURL command into a JavaScript fetch() call instantly online, for free. Perfect for copying requests from DevTools or Postman.
ETH Unit Converter
Convert between Wei, Gwei, and Ether with exact BigInt precision, instantly online. Free Ethereum unit converter — no rounding errors, no sign-up.
Favicon Generator
Generate favicon PNGs (16, 32, 48) and an Apple Touch icon from text or an uploaded image. Free favicon maker — no sign-up, runs in your browser.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly online, for free. Useful for checksums, file integrity checks, and password hashing.
HTML Entities Encoder / Decoder
Encode and decode HTML entities like < and > instantly online. Free tool for safely embedding user content in HTML, emails, and templates.
HTML Formatter
Format and beautify HTML markup online with proper indentation, instantly. Free HTML formatter for inspecting page source and email templates.
Image Compressor
Compress JPG, PNG, and WebP images online with a quality slider and before/after size comparison. Free, private, and 100% browser-based — no upload to a server.
Image Resizer
Resize images to exact pixel dimensions online with optional aspect-ratio lock. Free image resizer for JPG, PNG, and WebP — runs entirely in your browser.
Image to Base64
Convert any image to a Base64 data URL instantly online, for free. Supports PNG, JPG, GIF, WebP, and SVG — great for embedding images in CSS.
JavaScript Formatter
Format and beautify messy or minified JavaScript code online, instantly. Free JS formatter for readable, properly indented output — no sign-up.
JSON Compare
Compare two JSON documents online and highlight every addition, removal, and change. Free JSON compare tool with key-sorted, noise-free side-by-side results.
JSON Formatter
Format, validate, and minify JSON online for free. Instantly catch syntax errors, apply clean indentation, and minify with one click — no sign-up needed.
JSON Statistics
Analyze any JSON document's structure online — node count, depth, size, and type distribution. Free tool for understanding large API responses.
JSON to CSV
Convert a JSON array to CSV format instantly online, for free. Ready to open in Excel or Google Sheets — great for exporting API data.
JSON to TypeScript
Generate TypeScript interfaces from any JSON object instantly online, for free. Great for typing API responses — nothing leaves your browser.
JSON to YAML
Convert JSON to YAML format instantly online, for free. Paste any valid JSON and get clean, readable YAML output for config file conversions.
JWT Decoder
Decode JWT tokens online and inspect the header, payload, and signature instantly. Free JWT decoder for debugging auth — no data ever sent anywhere.
JWT Generator
Create signed JWT tokens online using HS256, HS384, or HS512 via the Web Crypto API. Free JWT generator for testing auth flows — no server calls.
JWT Validator
Verify a JWT token's HMAC signature and check its expiry online, instantly. Free JWT validator for HS256, HS384, and HS512 signed tokens.
Lorem Ipsum Generator
Generate classic lorem ipsum placeholder text online, instantly. Choose how many paragraphs you need for wireframes and mockups — free, no sign-up.
Markdown Previewer
Write Markdown online and see a live rendered HTML preview instantly. Free Markdown previewer for drafting READMEs, docs, and blog posts.
Mermaid Diagram Viewer
Render Mermaid diagram code into live flowcharts, sequence, ER, and class diagrams online. Free Mermaid viewer with zoom, pan, and SVG export.
Meta Tag Generator
Generate SEO meta tags, Open Graph, and Twitter Card tags with live Google and social previews. Free meta tag generator — copy-ready HTML.
Mock Data Generator
Generate realistic mock data online for testing APIs, seeding databases, or prototypes. Free tool exporting to JSON or CSV — no sign-up needed.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly online. Free number base converter for bitwise ops and memory addresses.
Password Generator
Generate strong, random passwords online using the Web Crypto API. Customize length and character sets, with a built-in strength indicator — free.
PDF Compare
Compare two PDF files online and highlight visual and text differences. Free multi-page PDF compare — runs in your browser, no upload to a server.
Prompt Template Filler
Fill in {{variables}} in any AI prompt template instantly online, for free. Open the resolved prompt directly in ChatGPT with one click.
QR Code Generator
Generate a QR code for any text, URL, or contact info instantly online. Free QR code generator with downloadable PNG output — no sign-up needed.
Regex Tester
Test and debug regular expressions online with live match highlighting. See match counts and positions instantly — free, no console needed.
Slug Generator
Convert any text into a clean, URL-friendly slug instantly online. Free slug generator for blog post URLs, API routes, and file names.
SQL Formatter
Format and beautify SQL queries online with dialect-aware indentation, for free. Supports MySQL, PostgreSQL, SQLite, and more — no sign-up.
SQL IN Generator
Turn a list of values into a ready-to-use SQL IN clause instantly online. Free tool that adds commas and quotes automatically — no sign-up.
String Escape / Unescape
Escape or unescape special characters in strings instantly online. Free tool for embedding strings in JSON, debugging APIs, and copying code.
Text Compare
Compare two blocks of text and highlight every change, line by line, instantly online. Free text compare tool for code, configs, and API responses.
Token Counter & Estimator
Count tokens and estimate API cost for GPT, Claude, and Gemini models online, instantly. Free token counter using OpenAI's real tiktoken tokenizer.
TOTP / OTP Generator
Generate RFC 6238 time-based one-time passwords (TOTP) online from a secret key. Free TOTP generator for testing 2FA flows — no sign-up needed.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back, instantly online. Supports local time, UTC, and ISO 8601 — free, no sign-up required.
URL Encoder / Decoder
Encode and decode URLs and query string parameters online, instantly. Supports value encoding, full URL encoding, and decoding — free tool.
URL Parser
Parse any URL into its components online — protocol, host, path, query params, and hash. Free URL parser for debugging redirects and OAuth callbacks.
URL Shortener
Shorten any URL online and get a free, shareable codinganthem.com/r/ link instantly. Optional link expiry and click tracking — no sign-up needed.
User-Agent Parser
Parse any User-Agent string into browser, engine, OS, and device details online. Free User-Agent parser for debugging logs and analytics data.
UUID Generator
Generate one or hundreds of random v4 UUIDs instantly online, for free. Perfect for database primary keys, session tokens, and API request IDs.
Word Counter
Count words, characters, sentences, and estimate reading time instantly online. Free word counter that updates live as you type or paste text.
XML Formatter
Format, validate, and beautify XML markup online with proper indentation, for free. Great for SOAP payloads, RSS feeds, and config files.
XML to JSON
Convert XML markup to a clean JSON object instantly online, for free. Perfect for parsing SOAP responses, RSS feeds, and legacy XML APIs.
YAML to JSON
Convert YAML configuration files to JSON format instantly online, for free. Perfect for docker-compose, GitHub Actions, and Kubernetes configs.
Privacy-first by default
Your JSON, passwords, and hashes never touch a server.
Results as you type
No submit buttons, no spinners — instant on every keystroke.
No account. Ever.
Open the URL, use the tool, close the tab. Free forever.
Pairs well with AI
Paste ChatGPT or Copilot output straight into any tool.
Frequently asked questions
Is my data safe when I use these tools?+
Yes. Most tools run entirely in your browser using JavaScript and the Web Crypto API, so nothing you paste is sent anywhere. A few tools (like URL Shortener) need a backend to work — those are clearly noted on the tool page and only store the minimum data required.
Do I need to create an account or sign up?+
No. All tools are free to use immediately — no sign-up, no login, no email required.
Are the tools actually free, or is there a paid tier?+
Completely free, with no paywalls or premium features. CodingAnthem is free forever.
How many tools does CodingAnthem offer?+
60 tools across formatters, encoders, generators, converters, security, and more — all free, all instant.
Can I use CodingAnthem alongside AI tools like ChatGPT or GitHub Copilot?+
Yes. Paste JSON, JWTs, SQL, or any AI-generated output directly into a tool to validate, format, or convert it — most tools process everything locally in your browser.