Developer Tools
JSON, Base64, regex, and UUID tools.
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Developers need reliable, fast utilities that do one thing well. Our developer tools cover encoding, formatting, generation, and debugging — all running entirely in the browser with zero setup.
The JSON formatter validates, beautifies, and minifies JSON data with syntax error detection. The XML and YAML formatters do the same for their respective formats. The CSV to JSON and JSON to CSV converters handle data transformation with automatic header detection.
Encoding tools include the Base64 encoder/decoder with URL-safe support, the HTML entity encoder/decoder for safe web embedding, and the URL encoder/decoder for query string manipulation. The hash generator produces MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input.
For generation, the UUID generator creates v4 and v7 identifiers, the password generator creates secure random passwords with entropy ratings, and the fake data generator produces mock names, emails, and addresses for testing. The QR code generator creates scannable codes for URLs, WiFi credentials, and vCards.
Debugging and inspection tools include the JWT decoder, regex tester with match highlighting, user agent parser, DNS lookup, and browser info detector. The API request builder generates cURL, fetch, axios, and Python requests.
All tools process data client-side. Paste API keys, tokens, or sensitive data without worry — nothing leaves your machine.
Popular Developer Tools
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All Developer Tools
CSS Minifier
Minify and compress CSS code to reduce file size.
JavaScript Minifier
Minify and compress JavaScript code to reduce file size.
Color Converter
Convert colors between HEX, RGB, and HSL formats.
JWT Decoder
Decode and inspect JSON Web Tokens in your browser.
URL Encoder / Decoder
Encode and decode URLs with percent-encoding.
Regex Tester
Test regular expressions in real-time with match highlighting.
HTML Formatter
Format, beautify, and minify HTML code with syntax validation.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
CSV to JSON Converter
Convert CSV files to JSON format with header detection.
SQL Formatter
Format and beautify SQL queries with syntax highlighting.
Markdown to HTML Converter
Convert Markdown to HTML with live preview.
What Is My IP
Find your public IP address, location, and ISP information.
Binary Converter
Convert between binary, decimal, hexadecimal, and octal.
Meta Tag Generator
Generate SEO-friendly meta tags for your website.
QR Code Generator
Generate QR codes for URLs, text, WiFi, and contact cards.
vCard QR Code Generator
Generate QR codes with contact information in vCard format for instant contact saving.
WiFi QR Code Generator
Generate QR codes to share WiFi network credentials for instant connection.
HTML Entity Encoder / Decoder
Encode and decode HTML entities for safe web embedding.
JSON to CSV Converter
Convert JSON arrays to CSV format with automatic headers.
Image to Base64 Encoder
Convert images to Base64 data URIs in your browser.
Color Palette Generator
Generate harmonious color palettes from any base color.
CSS Gradient Generator
Create linear and radial CSS gradients with visual editor, presets, and generated code.
HTML Table Generator
Generate HTML tables from spreadsheet data with styling options and clean code output.
Cron Expression Parser
Parse cron expressions into plain English with next run times.
Robots.txt Generator
Generate robots.txt files with allow, disallow, and crawl-delay rules.
URL Parser
Parse URLs into components and build query strings.
Favicon Generator
Generate favicon icons from text and colors in multiple sizes.
Fake Data Generator
Generate mock names, emails, addresses, and phone numbers for testing.
API Request Builder
Build cURL, fetch, axios, and Python API requests with custom headers and body.
User Agent Parser
Parse User-Agent strings to detect browser, operating system, and device information.
SERP Preview Tool
Preview how your page appears in Google search results and optimize title and meta description length.
Citation Generator
Generate APA, MLA, and Chicago citations for books, websites, and journal articles.
Cornell Notes Template
Create printable Cornell Notes templates with cues, notes, and summary sections.
Meta Tag Generator
Generate complete meta tags for your website: title, description, Open Graph, Twitter Cards, and viewport. Free online SEO meta tag builder.
CSS Flexbox Generator
Visually design CSS flexbox layouts with live preview and generated code.
Box Shadow Generator
Create CSS box shadows with a visual editor, multiple layers, and live preview.
XML Formatter
Format, beautify, and validate XML data with syntax highlighting and error detection.
YAML Formatter
Format and beautify YAML files with validation and syntax highlighting.
Diff Viewer
Compare two texts side-by-side with highlighted differences and unified diff output.
Git Command Generator
Generate common Git commands with explanations, flags, and parameter customization.
Barcode Generator
Generate Code 128, EAN-13, UPC-A, and Code 39 barcodes for products and inventory.
Business Card Maker
Create digital business cards with contact info and download as a shareable image.
GPA Predictor
Predict your final GPA and calculate what grades you need to achieve your target GPA.
Final Exam Calculator
Calculate what score you need on your final exam to achieve your desired overall grade.
Study Planner
Create a personalized study schedule with topic breakdowns and time allocation.
Flashcard Maker
Create printable study flashcards with terms and definitions.
Venn Diagram Maker
Create 2-circle and 3-circle Venn diagrams to compare and contrast concepts visually.
Concept Map Maker
Create concept maps with central ideas, connected nodes, and linking phrases.
Timeline Maker
Create visual timelines with dates, events, and descriptions for history or projects.
Periodic Table
Interactive periodic table with detailed element information, search, and category filtering.
Subnet Calculator
Calculate subnet masks, network ranges, broadcast addresses, and host counts from any IP address and CIDR.
DNS Lookup
Look up DNS records for any domain: A, AAAA, MX, TXT, CNAME, NS, and SOA records.
Subnet Mask Table
Quick reference table for all CIDR notations, subnet masks, wildcard masks, and host counts.
QR Code Reader
Scan and decode QR codes from images to reveal URLs, text, and contact information.
Frequently Asked Questions
Are these developer tools secure for sensitive data?▼
Yes. All processing happens in your browser. No data is sent to our servers. You can safely paste API keys, JWTs, and proprietary data.
What is the difference between MD5 and SHA-256?▼
MD5 is faster but cryptographically broken — suitable for checksums only. SHA-256 is secure and recommended for passwords, signatures, and verification.
Can the regex tester handle all regex flavors?▼
It uses JavaScript regex syntax, which covers most common patterns. Some advanced features from PCRE or Python may not be supported.
How do I format invalid JSON?▼
Paste your JSON into the formatter. If it is invalid, the tool highlights the exact line and column where the error occurs with a descriptive message.
What UUID version should I use?▼
Use UUID v4 for most applications requiring random unique IDs. UUID v7 is newer and database-friendly because it is sortable by creation time.
Can I generate QR codes for WiFi networks?▼
Yes. Use the WiFi QR code generator. Enter your SSID, password, and security type to create a scannable code that connects devices instantly.
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