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Convert JavaScript to TypeScript, format JSON, decode JWT tokens, generate UUIDs, format SQL, and 20+ more free tools — all running entirely in your browser with zero sign-up.

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Tool Categories

Developer utilities you will use every day

Organized discovery makes it easier for users to find and reuse the right utility quickly.

JSON Tools

Format, transform, and validate JSON workflows quickly.

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JSON FormatterBeautify, minify, validate, and sort JSON with one click.

CSV to JSON ConverterConvert CSV rows into clean JSON with header support and export-ready output.

JSON ⇄ YAML ConverterSwitch between JSON and YAML with readable formatting and validation.

Text Tools

Compare and analyze text content with high clarity.

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Diff CheckerCompare two texts to find exact line-level changes.

Regex TesterTest regular expressions with real-time match highlighting, flag toggles, and group capture details.

Case ConverterConvert text between camelCase, PascalCase, snake_case, kebab-case, UPPERCASE, and more.

Encoding Tools

Encode, decode, and inspect data safely for integrations.

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JWT DecoderDecode JWT header and payload securely in your browser.

Base64 Encoder / DecoderEncode UTF-8 text, decode Base64, and generate Data URIs from small files.

Code Converter Tools

Convert code and data structures into developer-friendly formats in seconds.

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JSON to TypeScript Types GeneratorConvert JSON into TypeScript interfaces and types with nested object and array support.

JSON to Java Classes GeneratorGenerate Java POJO classes from JSON with nested classes and ArrayList support.

JavaScript to TypeScript ConverterConvert basic JavaScript code to TypeScript with inferred annotations and simple interface hints.

HTML to JSX ConverterConvert HTML snippets into React JSX with className, htmlFor, style, and self-closing tag fixes.

Generators

Generate UUIDs, slugs, hashes, and other developer assets instantly.

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UUID GeneratorGenerate cryptographically secure UUID v4 or time-based UUID v1 identifiers in bulk.

Slug GeneratorConvert titles and text into clean, SEO-friendly URL slugs with Unicode normalisation.

Hash GeneratorGenerate MD5, SHA-1, and SHA-256 hashes from text or files directly in your browser.

Database & Query Tools

Format SQL, generate schemas, create dummy inserts, and optimize query text quickly.

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SQL FormatterBeautify SQL queries with dialect-aware formatting for MySQL, PostgreSQL, and T-SQL.

JSON to SQL SchemaConvert JSON samples into SQL CREATE TABLE schemas with inferred column data types.

SQL Dummy Data GeneratorGenerate realistic SQL INSERT statements for quick testing, seeding, and demo environments.

SQL MinifierMinify SQL by removing comments and unnecessary whitespace while keeping query logic intact.

Time & Epoch Utilities

Convert timestamps, coordinate timezones, visualize cron schedules, and normalize log times.

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Smart Epoch & Timestamp ConverterAuto-detect Unix, JavaScript, and ISO timestamps with instant multi-format output.

Global Meeting SlicerFind overlapping work hours across cities with a synchronized timeline slider.

Cron Expression VisualizerTranslate cron syntax to plain English and preview upcoming execution times.

ISO-8601 / RFC-3339 FormatterBuild and validate API-ready ISO-8601 and RFC-3339 date-time strings.

Log Timestamp NormalizerScan and normalize mixed-format log timestamps with timezone conversion and time shift controls.

Why DevToolPad

Built for Developers Who Value Their Time

25+ free tools for everyday coding tasks — JSON formatting, code conversion, encoding, SQL, time utilities, and more. No install. No sign-up.

✓Lightning-fast — instant results
✓No login or sign-up required
✓Privacy-first — runs in browser
✓Clean, distraction-free UI
✓Mobile-friendly design
✓Open to all — completely free

How It Works

From input to output in three steps

🧭

Choose a tool

Pick the utility you need from our tools library.

📋

Paste your input

Drop JSON, JWT, or raw text and run in one click.

⚡

Get instant results

See clean output immediately with zero waiting.

Roadmap

More Tools Coming Soon

URL Encoder/DecoderRegex TesterUUID GeneratorYAML ValidatorXML FormatterJSON ValidatorMinify/Uglify JSCSS MinifierHTML MinifierMarkdown to HTMLHash Generator (MD5/SHA)Password GeneratorColor Converter (HEX/RGB/HSL)Unix Timestamp ConverterQR Code GeneratorCron Expression EditorEnvironment Variable ParserMarkdown PreviewAPI Response Formatter