85+ Free Developer Tools

JSON Formatter & Validator

Format, validate, and minify JSON with one click. Clear syntax error display.

SQL Formatter

Auto-format SQL queries. Uppercase keywords and auto-indent.

XML Formatter

Format and minify XML. Syntax validation and indentation settings.

Markdown Preview

Real-time Markdown preview. Supports headings, lists, tables, code blocks.

SVG Optimizer NEW

Optimize and minify SVG. Remove comments, metadata, and simplify paths.

CSS Minifier NEW

Minify and beautify CSS code. Shows size reduction percentage.

JS Minifier NEW

Minify and beautify JavaScript. Remove comments and whitespace.

HTML Minifier NEW

Minify and beautify HTML. Remove comments and normalize whitespace.

YAML Validator NEW

Validate and format YAML. Error line display and pretty print.

Base64 Encoder/Decoder

Encode and decode text as Base64. Full Unicode/multibyte support.

URL Encoder/Decoder

URL encode and decode online. Handles non-ASCII and multibyte URLs.

HTML Entity Converter

Encode/decode HTML special characters as entities. Named and numeric entities.

Image to Base64

Convert images to Base64 data URLs. Drag & drop. Reverse conversion.

Escape/Unescape

Convert/restore backslash escapes. Handles \\n, \\t, \\r special characters.

String Escape/Unescape NEW

String escape/unescape for JavaScript, Python, Java, C, and more.

Text to Binary NEW

Convert text to/from binary, hex, octal, decimal. UTF-8 support.

Character Counter

Count characters, lines, bytes in real-time. Toggle space include/exclude.

Regex Tester

Test regex patterns in real-time. Highlight matches, view capture groups.

Regex Cheat Sheet

Regex syntax reference. Patterns, quantifiers, character classes, lookahead/lookbehind.

Text Diff Checker

Compare two texts, highlight additions/deletions. For code review and docs.

Text Case Converter

Convert to camelCase, snake_case, PascalCase, kebab-case. 10+ conversions.

HTML to Markdown

Convert HTML to Markdown. Headings, lists, tables, code blocks.

Lorem Ipsum Generator

Generate dummy text by paragraph, sentence, word count. Japanese support.

Slug Generator

Generate URL slugs from text. Customize delimiter and max length.

Word & Character Counter NEW

Real-time character, word, sentence, paragraph count. Reading time and keyword density.

Text to HTML NEW

Convert plain text to HTML. Auto-link URLs, line breaks, escape special chars.

Line Sort & Deduplicate NEW

Sort, deduplicate, reverse, number text lines. Text organization tool.

Markdown Table Generator NEW

Create Markdown tables with GUI. Set rows/columns, edit cells, alignment.

Unicode Lookup NEW

Display code point, UTF-8 bytes, HTML entities. String analysis mode.

Regex Generator NEW

Select and combine common regex patterns. Built-in testing.

YAML to JSON

Convert between YAML and JSON. Easy config file format conversion.

CSV to JSON

Convert between CSV and JSON. Custom delimiter and header settings.

JSON to CSV

Convert JSON to CSV and download. Flatten nested objects.

TOML to JSON

Convert between TOML and JSON. For Cargo.toml and config files.

JSON to TypeScript

Auto-generate TypeScript interface/type from JSON. Nested support.

JSON Path Finder

View JSON as tree, click to get JSONPath. Test path queries.

JSON Schema Validator NEW

Validate JSON against JSON Schema. Detailed validation errors.

Unix Timestamp Converter

Convert Unix timestamps and dates. Current time and timezone support.

Color Converter

Convert between HEX, RGB, HSL. Color picker and live preview.

Number Base Converter

Convert binary, octal, decimal, hex. BigInt support for large numbers.

Byte Converter

Convert B, KB, MB, GB, TB, PB. Decimal (1000) and binary (1024) modes.

Image Compressor

Compress/resize images in browser. JPEG, PNG, WebP. Adjustable quality.

Aspect Ratio Calculator NEW

Calculate aspect ratios and dimensions. 16:9, 4:3, 1:1 presets included.

JSON Diff Checker NEW

Compare two JSON objects visually. Highlight additions, deletions, changes.

Date/Time Calculator NEW

Calculate date difference, add/subtract time. Days, hours, minutes, seconds.

JSON to Go Struct NEW

Auto-generate Go struct definitions from JSON with json tags.

Markdown to HTML NEW

Safely convert Markdown text to HTML. Live preview.

SQL to JSON NEW

Generate JSON schema from CREATE TABLE, JSON data from INSERT.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes in real-time.

UUID Generator

Generate UUID v4 with cryptographically secure random. Bulk (up to 100).

Password Generator

Generate secure passwords. Customize length, characters, strength meter.

QR Code Generator

Generate QR codes from text/URLs. Custom size, color, PNG download.

Color Palette Generator

Generate harmonious color palettes. Complementary, analogous, triadic.

Placeholder Image Generator NEW

Generate placeholder images in any size. Custom colors and download.

Favicon Generator NEW

Generate favicons from text or emoji. PNG download.

Test Data Generator NEW

Bulk generate random test data. Names, emails, addresses, phones, dates.

Docker Compose Generator NEW

Generate docker-compose.yml from service templates.

Nginx Config Generator NEW

Generate Nginx configs for reverse proxy, SPA, static files, and more.

.env Generator NEW

Generate .env files from framework templates. Auto-generate secrets.

CSS Gradient Generator

Visually create linear and radial gradients. Add color stops and export CSS.

Box Shadow Generator

Intuitively set box-shadow with sliders. Multiple shadows and inset supported.

Flexbox Playground

Interactively adjust Flexbox properties. Live preview for layout confirmation.

Border Radius Generator

Set border-radius for each corner with sliders. Link/unlink toggle.

CSS Grid Generator NEW

Build CSS Grid layouts visually. Set rows, columns, gaps, and export CSS.

CSS Animation Generator NEW

Create CSS keyframe animations visually. Intuitive controls with live preview.

CSS Unit Converter NEW

Convert between CSS units: px, rem, em, vw, vh, %. Customizable base values.

CSS Selector Tester NEW

Test CSS selectors against HTML. Highlight matching elements.

Image Compressor Popular

Compress and resize images in the browser. JPEG, PNG, WebP output. Adjustable quality.

Placeholder Image Generator NEW

Generate placeholder images of any size. Customizable background/text colors and download.

Favicon Generator NEW

Create favicons from text or emoji. Download as PNG format.

QR Code Generator

Generate QR codes from text or URLs. Customizable size, color, and PNG download.

JWT Decoder

Decode JWT tokens to view Header, Payload, and Signature. Expiration check included.

JWT Generator NEW

Generate JWT tokens from custom header and payload. HS256 algorithm supported.

Cron Expression Parser

Parse cron expressions with human-readable descriptions and next execution times.

Crontab Generator NEW

Create cron expressions with an intuitive GUI. Presets and next execution time preview.

Chmod Calculator

Convert file permissions between numeric (755) and symbolic (rwxr-xr-x) notation.

HTTP Status Codes

Searchable reference of all HTTP status codes. Category filters included.

.gitignore Generator

Generate .gitignore from language/framework templates. Multi-select and customization supported.

IP Address Calculator NEW

IPv4 subnet calculation, CIDR notation conversion, and network information display.

cURL Converter NEW

Convert cURL commands to Python, JavaScript (fetch), PHP, Go, and more.

AI Token Counter NEW

Estimate token counts for GPT-4, Claude, and other LLMs. Character and word counts included.

HTML Preview NEW

Live preview of HTML/CSS/JS. Safe execution in a sandbox environment.

OpenAPI/Swagger Editor NEW

Edit and validate OpenAPI 3.0 specs. Visual endpoint listing.

HTTP Header Viewer NEW

HTTP header reference, builder, and analyzer tool.

DNS Lookup NEW

DNS record type reference and zone file builder.

Meta Tag Generator

Generate SEO, OGP, and Twitter Card meta tags with a form. Character count validation included.

OGP Preview

Preview OGP settings. View cards as they appear on Facebook, Twitter, Slack, and LINE.

OGP Tester NEW

Validate and test OGP meta tags. Image size recommendations, character count checks, and SNS previews.

Robots.txt Generator NEW

Generate robots.txt with a GUI. Crawler-specific rules and AI bot block presets.