241+ developer tools · all private, all free

Every developer tool you need, in one place

Format, convert, validate, encode and generate — JSON, YAML, code editors, time zones and more. No uploads, no accounts. Everything runs locally in your browser.

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241+: free tools
100%: in your browser
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Converters

101

Convert between JSON, XML, YAML, TOML, CSV, generate code & convert images, SVG, Markdown & styles

CSV to JSONConvert CSV rows into a JSON array of objects.CSV to XMLConvert CSV rows into structured XML records.CSV to YAMLConvert CSV rows into a clean YAML sequence of objects.CSV to JSON SchemaGenerate a JSON Schema from CSV columns with inferred property types.CSV to TypeScriptGenerate a typed TypeScript interface from CSV columns.CSV to GoGenerate a typed Go struct from CSV columns.CSV to PydanticGenerate a typed Pydantic model from CSV columns.Color ConverterConvert colors between HEX, RGB, HSL and more.XML to JSONConvert XML to JSON instantly in your browser.TOML to JSONConvert TOML config to JSON instantly in your browser.YAML to JSONConvert YAML config to JSON instantly in your browser.JSON to XMLConvert JSON to well-formed XML.TOML to XMLConvert TOML config to well-formed XML.YAML to XMLConvert YAML to well-formed XML.JSON to CSVConvert JSON to CSV for spreadsheets & data imports.XML to CSVConvert XML to CSV for spreadsheets & data imports.TOML to CSVConvert TOML to CSV for spreadsheets & data imports.YAML to CSVConvert YAML to CSV for spreadsheets & data imports.JSON to YAMLConvert JSON to YAML for Kubernetes, Ansible & CI.XML to YAMLConvert XML to YAML for config & pipelines.TOML to YAMLConvert TOML to YAML for config & pipelines.JSON to TOMLConvert JSON to TOML config.XML to TOMLConvert XML to TOML config.YAML to TOMLConvert YAML to TOML config.JSON to JavaGenerate Java classes from JSON.XML to JavaGenerate Java classes from XML.TOML to JavaGenerate Java classes from TOML.YAML to JavaGenerate Java classes from YAML.JSON to GoGenerate Go structs from JSON.XML to GoGenerate Go structs from XML.TOML to GoGenerate Go structs from TOML.YAML to GoGenerate Go structs from YAML.JSON to SchemaGenerate a JSON Schema from JSON.XML to SchemaGenerate a JSON Schema from XML.TOML to SchemaGenerate a JSON Schema from TOML.YAML to SchemaGenerate a JSON Schema from YAML.JSON to ProtobufGenerate Protocol Buffers messages from JSON.XML to ProtobufGenerate Protocol Buffers messages from XML.TOML to ProtobufGenerate Protocol Buffers messages from TOML.YAML to ProtobufGenerate Protocol Buffers messages from YAML.JSON to TypeScriptGenerate typed TypeScript interfaces from JSON.XML to TypeScriptGenerate typed TypeScript interfaces from XML.TOML to TypeScriptGenerate typed TypeScript interfaces from TOML.YAML to TypeScriptGenerate typed TypeScript interfaces from YAML.JSON to PydanticGenerate Pydantic BaseModel classes from JSON.XML to PydanticGenerate Pydantic BaseModel classes from XML.TOML to PydanticGenerate Pydantic BaseModel classes from TOML.YAML to PydanticGenerate Pydantic BaseModel classes from YAML.JSON to KotlinGenerate Kotlin data classes from JSON.XML to KotlinGenerate Kotlin data classes from XML.TOML to KotlinGenerate Kotlin data classes from TOML.YAML to KotlinGenerate Kotlin data classes from YAML.JSON to RustGenerate serde-ready Rust structs from JSON.XML to RustGenerate serde-ready Rust structs from XML.TOML to RustGenerate serde-ready Rust structs from TOML.YAML to RustGenerate serde-ready Rust structs from YAML.JSON to C#Generate C# classes from JSON.XML to C#Generate C# classes from XML.TOML to C#Generate C# classes from TOML.YAML to C#Generate C# classes from YAML.JSON to PythonGenerate Python dataclasses from JSON.XML to PythonGenerate Python dataclasses from XML.TOML to PythonGenerate Python dataclasses from TOML.YAML to PythonGenerate Python dataclasses from YAML.JSON to RubyGenerate Ruby structs from JSON.XML to RubyGenerate Ruby structs from XML.TOML to RubyGenerate Ruby structs from TOML.YAML to RubyGenerate Ruby structs from YAML.JSON to SwiftGenerate Swift Codable structs from JSON.XML to SwiftGenerate Swift Codable structs from XML.TOML to SwiftGenerate Swift Codable structs from TOML.YAML to SwiftGenerate Swift Codable structs from YAML.JSON to DartGenerate null-safe Dart classes from JSON.XML to DartGenerate null-safe Dart classes from XML.TOML to DartGenerate null-safe Dart classes from TOML.YAML to DartGenerate null-safe Dart classes from YAML.JSON to C++Generate C++ structs from JSON.XML to C++Generate C++ structs from XML.TOML to C++Generate C++ structs from TOML.YAML to C++Generate C++ structs from YAML.Excel to JSONConvert an .xlsx, .xls or .csv spreadsheet into JSON, with multi-sheet support. 100% private.JSON to ExcelTurn a JSON array of objects into a downloadable .xlsx Excel file, with multi-sheet support.XML to ExcelTurn XML with repeated elements into a downloadable .xlsx Excel file. 100% private.TOML to ExcelTurn a TOML array-of-tables into a downloadable .xlsx Excel file. 100% private.YAML to ExcelTurn a YAML list of records into a downloadable .xlsx Excel file. 100% private.SCSS to CSSCompile SCSS to CSS with Dart Sass in your browser.Sass to CSSCompile the indented Sass syntax to CSS.RSS to JSONConvert RSS 2.0 / Atom feeds to structured JSON.Markdown to HTMLRender Markdown to clean HTML — tables, code, links.HTML to MarkdownConvert HTML into clean Markdown with Turndown.Image to Base64Encode an image to a Base64 data URI and CSS background.Base64 to ImageDecode Base64 or a data URI back to an image.SVG to PNGRasterize SVG to PNG at any size, transparent or solid background. 100% private.SVG to JPGConvert SVG to a compact JPEG with adjustable quality and background fill. 100% private.SVG to WebPConvert SVG to a small, modern WebP with transparency and quality control. 100% private.JSON to Base64Encode JSON to UTF-8-safe Base64 for data URIs & tokens.Base64 to JSONDecode Base64 back to JSON and pretty-print it.XML to Base64Encode XML to Base64 for SOAP, SAML & transport.Base64 to XMLDecode Base64 to XML and check well-formedness.YAML to Base64Encode YAML to Base64 for Kubernetes Secrets.Base64 to YAMLDecode Base64 / K8s Secret values back to YAML.

Code Editors

Run & edit code in 16 languages right in your browser

Universal Code EditorMulti-language code editor with 25+ languages. Switch between Python, Java, C#, JavaScript, and more with autocomplete support.TypeScript EditorOnline TypeScript editor with LIVE EXECUTION. Run TypeScript code in browser instantly with type safety and IntelliSense.JavaScript EditorOnline JavaScript editor with LIVE EXECUTION. Run JS in your browser instantly with console output, ES6+ support and autocomplete.Python EditorOnline Python editor with LIVE EXECUTION powered by Pyodide. Run Python code in browser with NumPy support.HTML/CSS EditorOnline HTML/CSS editor with LIVE PREVIEW. See your webpage changes instantly in real-time iframe preview.Java EditorOnline Java code editor with autocomplete. Write Java classes and methods with intelligent code completion and syntax highlighting.C# EditorOnline C# code editor with IntelliSense. Write .NET code with autocomplete support for classes, properties, and LINQ patterns.C++ EditorOnline C++ code editor with autocomplete. Write modern C++ code with STL support and intelligent syntax highlighting.Node.js EditorOnline Node.js/JavaScript editor with autocomplete. Write Express routes, async functions, and promises with intelligent suggestions.Go EditorOnline Go (Golang) editor with autocomplete. Write Go code with intelligent suggestions for functions, structs, and interfaces.PHP EditorOnline PHP code editor with autocomplete. Perfect for WordPress and Laravel development with intelligent code suggestions.Ruby EditorOnline Ruby code editor with autocomplete. Write Ruby on Rails code with elegant syntax and intelligent suggestions.Rust EditorOnline Rust code editor with autocomplete. Write memory-safe Rust code with ownership patterns and intelligent suggestions.Kotlin EditorOnline Kotlin code editor with autocomplete. Perfect for Android development with data classes and intelligent suggestions.R EditorOnline R code editor with autocomplete. Write data science and statistical code with ggplot2 support and intelligent suggestions.SQL EditorRun real SQLite in your browser — create tables, query with JOINs & window functions, results as tables. Persists across reloads.

Format · Validate · View

Beautify, minify, validate & explore JSON, XML, CSS, JS, HTML, SQL & YAML

JSON ViewerExplore JSON as an interactive collapsible tree — expand/collapse & copy on hover.XML ViewerExplore XML as a collapsible tree of elements, attributes & text.TOML ViewerExplore TOML as a collapsible tree of tables, arrays & values.YAML ViewerExplore YAML as a collapsible tree of keys, lists & values.CSV ViewerExplore CSV as an interactive tree — rows, columns & typed cells. Search, expand/collapse all, copy on hover.JSON FormatterFormat, validate, beautify & minify JSON, and convert it to XML, YAML, CSV, TOML & more.XML FormatterBeautify and indent messy or minified XML in your browser.XML MinifierCompress XML by stripping insignificant whitespace.JSON Schema ValidatorValidate JSON data against a JSON Schema with path-pinpointed errors (Ajv).Markdown ViewerA real-time preview tool for Markdown. Edit your Markdown content and instantly see the rendered output with support for all Markdown elements.JSONPath TesterEvaluate JSONPath expressions against your JSON — wildcards, recursion, slices and filters. 100% private.XPath TesterEvaluate XPath expressions against your XML and see every matching node instantly. 100% private.CSS FormatterBeautify and indent messy or minified CSS instantly in your browser.CSS MinifierCompress CSS by stripping comments and whitespace to speed up page loads.JavaScript FormatterBeautify and indent messy or minified JavaScript in your browser.JavaScript MinifierCompress and mangle JavaScript with terser to shrink file size.HTML FormatterBeautify and indent messy or minified HTML markup in your browser.HTML MinifierSafely compress HTML by removing comments and inter-tag whitespace.SQL FormatterPretty-print and indent SQL queries with uppercased keywords.YAML FormatterBeautify, re-indent and validate YAML in your browser.YAML ValidatorCheck YAML syntax and preview the parsed structure.XML ValidatorCheck XML is well-formed and see the exact parse error.HTML ValidatorCheck HTML markup is well-formed with balanced tags.JSON5 FormatterBeautify JSON5 or convert it to standard JSON.JSON5 ValidatorValidate JSON5 — comments, trailing commas, unquoted keys.

Text, Generators & Security

Transform & encode text, escape strings, generate passwords, hashes, QR codes & tokens

UUID GeneratorGenerate v4 (and more) UUIDs for keys, records and tests.JWT DecoderDecode and inspect a JSON Web Token's header, payload and claims.Regex TesterTest regular expressions against sample text with live matches.Speech to TextTranscribe speech to text in your browser via the Web Speech API.Case ConverterConvert text between uppercase, lowercase, title case, camelCase, snake_case, kebab-case, and more. Perfect for developers and writers.Text ReverserReverse text, words, or characters in multiple ways. Create mirror text, word puzzles, or backwards text effects.Lorem Ipsum GeneratorGenerate placeholder text for design mockups and development projects. Choose paragraphs, sentences, or words.Text to SpeechConvert text to spoken audio using browser-based TTS. Multiple voices, adjustable speed and pitch. Perfect for accessibility.Base64 Encoder/DecoderEncode and decode Base64 strings. Essential for API development, data transmission, and embedding images in HTML/CSS.URL Encoder/DecoderEncode and decode URLs and query parameters. Make URLs safe for transmission and handle special characters properly.HTML Entity EncoderConvert HTML special characters to entities and vice versa. Prevent XSS attacks and display code snippets safely.Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes from text. Perfect for checksums, password hashing, and data integrity.Diff CheckerA powerful tool to compare text or code side by side. Easily identify changes between two versions of text files or documents.Word CountA simple tool to count the number of words in your text. Great for writers, students, and professionals who need to track their word usage.Character CountQuickly count the characters in your text, including spaces. Perfect for meeting character limits in social media posts, SMS, or web forms.Password GeneratorCreate strong, random, secure passwords with custom length and character sets. 100% client-side.QR Code GeneratorTurn any URL or text into a QR code and download it as PNG or SVG. Live preview, 100% private.HMAC GeneratorCompute HMAC-SHA256, SHA-384, SHA-512 and SHA-1 from a message and secret key, as hex or Base64. 100% private.JWT EncoderBuild and sign a JSON Web Token (HS256/384/512) from your payload and secret, right in your browser.Meta Tag GeneratorGenerate SEO, Open Graph and Twitter Card meta tags from a simple form and copy the HTML.Favicon GeneratorTurn an image, letter or emoji into a multi-size favicon.ico and PNG icon set with the <head> HTML. 100% private.String EscaperEscape/unescape strings for JSON, JS, CSV, SQL, HTML.JSON EscapeEscape/unescape JSON strings per RFC 8259.JavaScript EscapeEscape/unescape JS string & template literals.SQL EscapeEscape single quotes for SQL string literals.HTML EscapeEscape/unescape HTML entities to prevent XSS.XML EscapeEscape/unescape the five XML predefined entities.CSV EscapeQuote/escape CSV fields per RFC 4180.Slug GeneratorTurn a title into a clean, URL-safe slug.Bcrypt GeneratorHash and verify passwords with bcrypt in your browser.

Network & Utilities

Subnets, IP/CIDR, MAC, user-agent & email tools, HTTP codes, calculators & references

Number Base ConverterConvert numbers between binary, octal, decimal and hex.Cron ExpressionTranslate cron schedules to English and see next runs.REM to PXConvert CSS rem and px units with any root font size.URL ParserBreak a URL into protocol, host, path, query and hash.Number to WordsSpell out any number in English — cheques and forms.Subnet CalculatorIPv4 CIDR to network, mask, host range and counts.Roman NumeralsConvert numbers ↔ Roman numerals (1–3999), both ways.Credit Card ValidatorLuhn-check a card number and detect the brand.Punycode ConverterConvert IDN domains to/from ASCII Punycode.User-Agent ParserBreak a UA string into browser, OS, device and CPU.HTTP Status CodesFull reference of HTTP status codes 100–511.CIDR to IP RangeConvert an IPv4/IPv6 CIDR block to its first & last IP and address count.IP Address ConverterConvert an IPv4 address to/from decimal, hex, binary and octal.IPv6 Expand & CompressExpand an IPv6 address to full form or compress it per RFC 5952.MAC Address LookupIdentify the vendor (OUI) of a MAC address and normalize its format.MAC Address GeneratorGenerate random MAC addresses with custom OUI, bits and format.Email Header AnalyzerTrace email delivery hops and read SPF/DKIM/DMARC from raw headers.

Time & Calendar

Time-zone converters, world clock & calendar tools

Private by design

Free developer tools that keep your data on your device

Seagit Tools is a collection of 241+ free utilities developers reach for every day — formatting and validating JSON, YAML and XML, converting between data formats, generating typed models, encoding Base64 and JWTs, hashing, and converting time zones. Instead of hunting for a different single-purpose site each time, they live in one fast place with a consistent interface.

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100% client-side

Every tool runs in your browser. When you paste JSON, write code or convert a file, the work happens locally in JavaScript (and a WebAssembly Web Worker for the code editors) — nothing you enter is ever uploaded to a server.

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Instant, no signup

Results appear as you type. No account to create, no upload limits, and no waiting on a server round-trip — and the tools keep working on flaky connections once the page has loaded.

🛡️

Safer for real work

Developers routinely paste configuration, tokens and production payloads into online tools. Because everything is processed client-side, sensitive data never leaves your machine — a safer default than tools that send your input to a backend.

Who builds Seagit Tools & how privacy works →

Seagit Tools is a comprehensive suite of 70+ free online developer tools designed to streamline your workflow and boost productivity. Whether you're a professional developer, student, DevOps engineer, or data analyst, our tools help you work faster and smarter without installing any software.

🚀 Complete Toolset for Developers

Our platform combines powerful JSON tools, time zone converters, code editors, Islamic prayer times calculators, and text utilities—all in one place. Every tool is free, works offline after loading, and respects your privacy by processing data locally in your browser.

✨ JSON Tools & Converters

Our JSON tools cover API development, configuration management, and data transformation:

JSON Validator - Instantly validate JSON with detailed error messages showing exact line numbers and error types for easier debugging
JSON Formatter/Beautifier - Auto-format messy JSON with customizable indentation (2, 3, or 4 spaces) for better readability
JSON Minifier - Compress JSON by removing whitespace to reduce file size for production environments
JSON to YAML Converter - Transform JSON to YAML format for Kubernetes, Docker Compose, and configuration files
JSON to XML Converter - Convert JSON to XML for legacy systems and SOAP APIs
JSON to CSV - Export JSON arrays to CSV for Excel and data analysis tools
JSON to Code Generators - Generate Java classes, Golang structs, Python dataclasses, and more from JSON
JSON Schema Generator - Automatically create JSON Schema from your JSON data for validation
Tree View Preview - Visualize JSON structure with collapsible tree view and inline image previews from URLs
File Upload/Download - Work with JSON files directly—upload, format, convert, and download in one click
Local Storage Auto-Save - Never lose your work! Last formatted JSON is automatically saved in your browser

🌍 World Time & Time Zone Tools

Perfect for remote teams, international business, and scheduling meetings across continents:

Visual Time Zone Converter - See multiple time zones simultaneously with color-coded hour tiles
20+ Specific Converters - Dedicated pages for popular conversions (EST to PST, GMT to IST, etc.)
Meeting Scheduler - Find the perfect meeting time across different time zones with visual overlap detection
Automatic DST - Daylight Saving Time changes handled automatically for accurate conversions
City-to-City Conversion - Convert time between 200+ major cities worldwide
Weekend Highlighting - Easily identify weekends when scheduling international calls

🕌 Islamic Tools

Accurate Islamic tools trusted by Muslims worldwide:

Prayer Times Calculator - Get precise Salah times for Fajr, Dhuhr, Asr, Maghrib, and Isha based on your location
200+ Cities Worldwide - Pre-configured for major Muslim cities from Mecca to New York
Multiple Calculation Methods - Choose from Muslim World League, ISNA, Egyptian, Umm Al-Qura, Karachi, Tehran, and Jafari
Hijri Calendar - Today's Islamic date with countdown to Ramadan, Eid al-Fitr, Eid al-Adha, and all major occasions
12H/24H Time Formats - Display prayer times in your preferred format with auto-save
Share & Export - Copy prayer schedules as text, social media cards, or embeddable widgets

💻 Code Editors (12 Languages)

Browser-based code editors with syntax highlighting and IntelliSense:

Python, JavaScript, TypeScript, Java, C++, C#, Go, PHP, Ruby, Rust, Kotlin, R
Autocomplete and error detection
Multiple themes (VS Dark, Light, High Contrast)
Auto-save to browser storage
Perfect for learning, testing snippets, and quick prototyping

📝 Text Utilities

Character Counter - Count characters, words, lines, and paragraphs in real-time
Word Counter - Track word count for essays, articles, and social media posts
Case Converter - Transform text to UPPERCASE, lowercase, Title Case, camelCase, snake_case
Text Reverser - Reverse text or words for creative purposes
Lorem Ipsum Generator - Generate placeholder text for design mockups
Diff Checker - Compare two text blocks and highlight differences
Base64 Encoder/Decoder - Encode or decode Base64 strings
URL Encoder/Decoder - Safely encode/decode URLs and query strings
HTML Encoder/Decoder - Convert special characters for HTML display
Hash Generator - Generate MD5, SHA-1, SHA-256 hashes for security

📅 Calendar Tools

Hijri Calendar - Islamic calendar with dates for all Muslim occasions and holidays
Gregorian Calendar - Christian calendar with Easter calculator and all Christian holidays
Calendar Converter - Convert between Hijri and Gregorian calendars instantly

🔒 Privacy & Security

100% Client-Side Processing - All tools run in your browser using JavaScript
No Data Upload - Your sensitive data never leaves your device
No Registration Required - Use all tools instantly without creating an account
Works Offline - After initial load, tools work without internet connection
GDPR Compliant - We don't collect, store, or transmit your data

🎯 Why Choose Seagit Tools?

✓ 100% Free Forever

No hidden costs, premium tiers, or feature limitations. Everything is free.

✓ Lightning Fast

All processing happens locally in your browser for instant results.

✓ Mobile-Friendly

Fully responsive design works perfectly on phones, tablets, and desktops.

✓ No Installation

Web-based tools require no downloads or software installation.

✓ Dark Mode

Eye-friendly dark theme for late-night coding sessions.

✓ Regular Updates

New tools and features added based on user feedback.

👥 Who Uses Seagit Tools?

👨‍💻

Software Developers - Format API responses, validate JSON configs, convert data formats

🔧

DevOps Engineers - Work with YAML/JSON configs for Kubernetes, Docker, Terraform

📊

Data Analysts - Convert JSON to CSV, transform data between formats

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Students & Learners - Practice coding, test code snippets, learn programming languages

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Remote Teams - Schedule meetings across time zones, coordinate international calls

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Muslim Community - Get accurate prayer times, track Islamic calendar, countdown to Ramadan

✍️

Content Writers - Count words, check character limits, format text

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Designers - Generate Lorem Ipsum, encode images, format data for mockups

🚀 Get Started in Seconds

Choose a tool from the navigation menu or search bar
Paste your data, upload a file, or start typing
Click the action button (Format, Convert, Validate, etc.)
Copy, download, or share your results

No sign-up, no payment, no hassle. Just powerful tools at your fingertips.

Whether you're debugging an API response at 2 AM, scheduling a meeting across 5 time zones, or checking prayer times while traveling—Seagit Tools has you covered. Bookmark this page and make it your go-to developer toolkit! 🎯