Developer Tools
75 ToolsFree online developer tools for formatting, encoding, converting, and generating data. JSON formatter, Base64 encoder, QR code generator, PDF editor, image compressor, and more — all in your browser, no sign-up required.
Formatters & Minifiers
6Format, beautify, and minify JSON, CSS, SQL, JavaScript, HTML, and XML code for cleaner, optimized output.
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax highlighting and error detection.
CSS Formatter & Minifier
Format, beautify, and minify CSS. Toggle between formatted and minified output.
SQL Formatter
Format and beautify SQL queries. Clean up SQL code with proper indentation and spacing.
JavaScript Formatter & Minifier
Format, beautify, and minify JavaScript code with proper indentation.
HTML Formatter & Minifier
Format, beautify, and minify HTML with proper indentation and tag nesting.
XML Formatter & Minifier
Format, beautify, and minify XML with proper indentation and syntax error detection.
Encoders & Decoders
4Encode and decode Base64, URLs, HTML entities, and JWT tokens instantly.
Base64 Encode/Decode
Encode and decode Base64 strings instantly. Supports text and file encoding.
URL Encode/Decode
Encode and decode URL components. Handle special characters in URLs safely.
HTML Entity Encode/Decode
Encode and decode HTML entities. Convert special characters to HTML entity references.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and signature with expiration status.
Generators
4Generate UUIDs, passwords, QR codes, and placeholder text for your projects.
UUID / ULID Generator
Generate and validate UUIDs and ULIDs. Create UUIDs v4 and monotonic ULIDs in bulk.
Lorem Ipsum Generator
Generate placeholder text with customizable paragraph count and word length.
Password Generator
Generate secure passwords with configurable length, character types, and strength meter.
QR Code Generator
Generate QR codes from text or URLs. Customize size, colors, and error correction level.
Converters
8Convert between colors, timestamps, number bases, string cases, JSON/YAML/CSV, and image formats.
Color Converter
Convert colors between HEX, RGB, HSL formats with a live preview swatch.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases.
String Case Converter
Convert strings between camelCase, snake_case, PascalCase, kebab-case, and more.
JSON ↔ YAML Converter
Convert between JSON and YAML formats. Auto-detect input format with error handling.
JSON ↔ CSV Converter
Convert between JSON arrays and CSV. Handles nested objects with dot notation flattening.
Image Format Converter
Convert images between PNG, JPG, and WebP formats. Client-side conversion with quality control.
Markdown Preview
Live preview of Markdown to HTML. Write Markdown and see the rendered output in real-time.
Text & Data
13Analyze, compare, search, sort, and transform text with powerful online utilities.
Diff Checker
Compare two texts side by side and see the differences highlighted line by line.
Regex Tester
Test regular expressions with real-time match highlighting and capture groups.
Word & Character Counter
Count words, characters, sentences, and paragraphs. Includes reading time and keyword analysis.
Slug Generator
Convert titles to URL-friendly slugs. Supports transliteration, custom separators, and max length.
Duplicate Line Remover
Remove duplicate lines from text with options for case sensitivity and whitespace trimming.
Sort Lines
Sort lines alphabetically, numerically, by length, reverse, or randomly. Multiple sort modes.
Find & Replace
Find and replace text with regex support, case sensitivity, and whole word matching.
Text to Speech
Convert text to speech using browser native API. Adjustable voice, rate, and pitch.
Speech to Text
Convert speech to text using browser native API. Real-time transcription with language selection.
Whitespace & Invisible Character Remover
Remove whitespace, zero-width characters, and invisible Unicode from text.
ASCII Art Generator
Convert text to ASCII art using block-letter fonts. Copy and share text art.
Text Repeater
Repeat text N times with configurable separator. Newline, space, comma, or custom.
Palindrome Checker
Check if text is a palindrome. Handles phrases with options for case and special characters.
Markdown Tools
5Convert, preview, compare, and generate Markdown with interactive tools.
Markdown → HTML Converter
Convert Markdown to clean HTML output. Supports headings, lists, links, code blocks, and more.
HTML → Markdown Converter
Convert HTML to Markdown. Handles headings, links, images, lists, and code blocks.
Markdown Table Generator
Visual table editor that outputs Markdown table syntax. Add rows, columns, and set alignment.
Markdown Cheatsheet
Interactive Markdown syntax reference with searchable examples for all formatting options.
Markdown Diff Viewer
Compare two Markdown files side by side with color-coded line-by-line diff view.
Security & Crypto
1Generate cryptographic hashes including MD5, SHA-1, SHA-256, and SHA-512.
CSS & Design
3Build CSS gradients, box shadows, and color palettes with visual editors.
CSS Gradient Generator
Build linear and radial CSS gradients visually. Customize colors, angles, and stops.
Box Shadow Generator
Create CSS box shadows visually. Multiple layers, inset shadows, and live preview.
Color Palette Generator
Generate harmonious color palettes. Complementary, triadic, analogous, and monochromatic schemes.
Network & Web
5Parse user agents, look up HTTP status codes, preview meta tags, and check IP addresses.
User Agent Parser
Parse user agent strings to identify browser, OS, device type, and rendering engine.
HTTP Status Codes
Searchable reference of all HTTP status codes with descriptions and use cases.
Meta Tag Preview
Preview how your page appears in Google, Facebook, and Twitter. Generate meta tag HTML.
IP Address Lookup
Look up your public IP address and geolocation info including city, region, country, and ISP.
MIME Type Lookup
Searchable reference of common MIME types by file extension and category.
Dev Utilities
4Parse cron expressions, calculate chmod permissions, convert JSON to TypeScript, and more.
Cron Expression Parser
Parse and explain cron expressions. See the schedule breakdown and next execution times.
Chmod Calculator
Calculate Unix file permissions. Toggle read/write/execute for owner, group, and others.
JSON to TypeScript
Generate TypeScript interfaces from JSON. Handles nested objects, arrays, and optional fields.
Percentage Calculator
Calculate percentages: X% of Y, what percent X is of Y, and percentage change between values.
PDF Tools
11Merge, split, compress, rotate, sign, and extract text from PDF files in your browser.
PDF Page Extractor
Extract individual pages from a PDF as separate single-page PDF files.
Merge PDFs
Upload multiple PDFs and merge them into a single document. Reorder before merging.
Split PDF
Extract specific pages or page ranges from a PDF into a new document.
Compress PDF
Reduce PDF file size by re-saving with optimized settings. See before/after comparison.
PDF Metadata Viewer
View PDF page count, title, author, creation date, and other document metadata.
Rotate PDF Pages
Rotate individual PDF pages by 90°, 180°, or 270°. Select pages and apply rotation.
PDF → Text Extractor
Extract text content from PDF documents. Copy or download extracted text.
Add Password to PDF
Encrypt a PDF with a password. Set user and owner passwords for document protection.
Remove Password from PDF
Unlock a password-protected PDF. Enter the password to decrypt and download.
Reorder PDF Pages
Rearrange PDF pages by moving them up or down. Download the reordered document.
Sign PDF
Draw or upload a signature and place it on any page of a PDF document.
Image Tools
11Resize, compress, crop, convert, and extract metadata from images online.
Resize Image
Resize images to custom dimensions with aspect ratio lock. Preview and download.
Compress Image
Reduce image file size with adjustable quality. See before/after size comparison.
Crop Image
Crop images with custom region or preset aspect ratios (1:1, 16:9, 4:3). Preview and download.
Image → Base64
Convert images to Base64 encoded strings with data URI prefix. Copy to clipboard.
Base64 → Image
Convert Base64 strings back to images. Preview and download the decoded image.
Image Metadata Viewer (EXIF)
View EXIF metadata from images including camera, dimensions, GPS, and date information.
Grayscale & Color Filters
Apply grayscale, sepia, invert, brightness, contrast, and blur filters to images.
SVG → PNG Converter
Convert SVG files or code to PNG images at custom resolution. Paste SVG or upload file.
Favicon Generator
Generate favicons at standard sizes (16x16 to 256x256) from a PNG image. Download individual sizes.
Color Picker & Palette Extractor
Pick colors from images and extract dominant color palettes. Click anywhere to sample.
Placeholder Image Generator
Generate placeholder images with custom dimensions, colors, text, and format.