Developer Tools
Conversion and transformation tools for developers. Everything runs in your browser — no data leaves your device.
59 tools
JWT Decode
Decode JWT tokens instantly in your browser. View header, payload, and signature. No data sent to an...
CSS Gradient Generator
Create linear, radial, and conic CSS gradients with live preview. Copy the CSS code with one click. ...
CSS Box Shadow Generator
Create CSS box shadows with live preview. Multiple shadows, inset, blur, spread. Copy production-rea...
OG Meta Tags Generator
Generate Open Graph and Twitter Card tags for any webpage. Preview how your link will appear on soci...
WCAG Color Contrast Checker
Check color contrast ratios against WCAG 2.1 AA and AAA standards. Instantly verify if your text and...
Cron Expression Tester
Test and validate cron expressions instantly. Visualize next run times, explore the 5-field format, ...
Robots.txt Generator
Generate a correct robots.txt file to control search engine crawling. Configure rules for Googlebot,...
JSON to TypeScript
Convert JSON to TypeScript interfaces instantly. Generate type-safe interfaces for your API with nes...
CSS Unit Converter
Convert between px, rem, em, vw, vh, % and more CSS units. Calculate relative values based on base f...
cURL to Code
Convert cURL commands to code in JavaScript, Python, Go, PHP, and more. Integrate APIs in seconds wi...
JSON Schema Generator
Generate JSON Schema from any JSON instantly. Compatible with draft 2020-12. Perfect for API validat...
Structured Data Validator
Validate structured data JSON-LD and Schema.org online for free. Detect errors in Article, Product, ...
.htaccess Generator
Generate .htaccess files for Apache free: HTTPS redirect, www vs non-www, Gzip compression, browser ...
Regex Tester
Test regular expressions in real time. Match highlighting, capture groups, flags, and pattern explan...
JSON to Go Struct
Generate typed Go structs from JSON. JSON tags included, types inferred automatically. No signup req...
JSON to Python Dataclass
Generate Python dataclasses with type hints from JSON. PEP 557 compatible, ready to use. No signup r...
CSS to Tailwind
Convert traditional CSS to Tailwind utility classes. Migrate your project to utility-first styling. ...
JSON Path Finder
Click on any value in your JSON and get its exact path instantly. Perfect for debugging APIs and wri...
JSON to Java Class
Generate Java POJO classes from JSON automatically. With getters, setters, and nested classes. Ready...
JSON to C# Class
Generate C# classes from JSON automatically. With auto-properties, nullable types, and nested classe...
JSON to SQL CREATE TABLE
Generate SQL DDL statements from JSON automatically. Infers VARCHAR, INTEGER, DECIMAL, and BOOLEAN t...
JSON Diff
Compare two JSON objects and visualize differences instantly. Added in green, removed in red, change...
JSON to Kotlin Data Class
Generate Kotlin data classes from JSON automatically. val/var properties, nullable types, kotlinx.se...
JSON to Rust Struct
Generate Rust structs with serde from JSON automatically. #[derive] macro, snake_case convention, Op...
JSON to Swift Struct
Generate Codable Swift structs from JSON automatically. CodingKeys enum, Optional properties, URLSes...
JSON to PHP Class
Generate typed PHP classes from JSON automatically. PHP 7.4+ typed properties, PHP 8.0+ constructor ...
JSON to Dart Class
Generate Dart classes for Flutter from JSON. Factory fromJson pattern, null safety, json_serializabl...
JSON to GraphQL Schema
Generate GraphQL schemas from JSON automatically. Types, scalars, nested fields. Apollo Server, sche...
chmod Calculator
Calculate Unix file permissions in octal and symbolic notation. Convert chmod 755, 644, and any perm...
Regex Explainer
Convert regex patterns to plain English. Understand complex regular expressions instantly. No signup...
Date Format Converter
Convert between date format syntaxes: strftime, Moment.js, ICU, Go, PHP, Java. Complete format token...
IP Address Converter
Convert IP addresses between decimal, binary, hex, and integer. IPv4, CIDR, private ranges. No signu...
ASCII/Unicode Table
Interactive ASCII and Unicode character table. Look up by character, decimal, hex, or binary code. N...
JWT Token Encoder
Create JWT tokens with header, payload, and HMAC-SHA256 signature. No data upload, 100% private....
HTML to JSX
Transform HTML into valid JSX for React and Next.js. No file upload, 100% private....
CSS Color Names
Explore all 148 named CSS colors. Search, filter, and convert between CSS names, HEX, RGB, and HSL. ...
SVG Optimizer
Optimize and minify SVG files. Remove metadata, simplify paths, reduce decimals. Before/after previe...
JSON to Ruby
Transform JSON to Ruby Hash with symbol keys, Structs, or OpenStruct. No file upload, 100% private....
CSV to JSON
Convert CSV files to structured JSON. Ideal for APIs, databases, and web development. Local processi...
JSON to CSV
Convert JSON to CSV for Excel, Google Sheets, or database import. Local processing, 100% private....
YAML to JSON
Convert YAML files to JSON. Ideal for DevOps, Docker, Kubernetes, and CI/CD. Local processing, 100% ...
JSON to YAML
Convert JSON to human-readable YAML. Ideal for Docker Compose, GitHub Actions, and Kubernetes. Local...
XML to JSON
Convert XML files to modern JSON. Ideal for SOAP to REST API migration. Local processing, 100% priva...
JSON to XML
Convert JSON to XML for SOAP integrations, Android, and legacy configurations. Local processing, 100...
TypeScript to JavaScript
Transpile TypeScript code to JavaScript. Remove types, interfaces, and decorators. Local processing,...
SCSS to CSS
Compile SCSS/Sass code to pure CSS. No Node.js, no npm install. Local processing, 100% private....
LESS to CSS
Compile LESS code to pure CSS. No Node.js, no npm. Local processing, 100% private....
TSV to CSV
Convert TSV (tab-separated) files to CSV (comma-separated). Local processing, 100% private....
CSV to TSV
Convert CSV files to TSV (tab-separated). Local processing, 100% private....
JSON to TOML
Convert JSON to TOML for Cargo.toml, Hugo, Netlify, and Rust configs. Local processing, 100% private...
TOML to JSON
Convert TOML files (Cargo.toml, Hugo, pyproject.toml) to JSON. Local processing, 100% private....
CSV to XML
Convert CSV data to structured XML. Ideal for imports, SOAP APIs, and configurations. Local processi...
YAML to CSV
Convert YAML data to CSV for Excel or Google Sheets. Local processing, 100% private....
CSV to YAML
Convert CSV data to human-readable YAML. Ideal for Ansible, Docker, and configurations. Local proces...
Sass to CSS
Compile indented Sass syntax to pure CSS. No Node.js required. Local processing, 100% private....
XML to YAML
Convert XML files to human-readable YAML. Ideal for config migration. Local processing, 100% private...
YAML to XML
Convert YAML to XML for SOAP integrations and legacy systems. Local processing, 100% private....
TOML to YAML
Convert TOML (Cargo, Hugo) to YAML (Docker, K8s). Local processing, 100% private....
YAML to TOML
Convert YAML to TOML for Cargo.toml and Rust configs. Local processing, 100% private....
FAQ
Got questions?
Yes. Everything runs in your browser with JavaScript. No code, tokens, or data are sent to servers.
Yes. JWT is decoded locally — it never leaves your browser. Perfect for safely debugging production tokens.
JavaScript (fetch), Node.js (axios), Python (requests), and PHP (cURL).
Yes. The structured data validator checks your JSON-LD against Schema.org types and shows errors, warnings, and missing fields.
Online web development tools
Web developers constantly work with conversions: decoding JWT tokens, transforming JSON into TypeScript interfaces, converting cURL commands into code, and generating visual CSS. These tasks require fast, secure tools.
Convertir.ai offers developer tools that run entirely in the browser. This is critical for security: when working with API keys, production JWT tokens, or proprietary code, you don't want that data passing through third-party servers.
All tools are pure JavaScript — no external dependencies, no API calls, no tracking. Open the tool, paste your data, get the result.