Free Online Developer Tools
Powerful developer utilities that run 100% in your browser. No data leaves your device. Fast, secure, and always free.
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All Tools (100)
URL Encoder
Encode or decode URLs securely.
Base64 Encoder
Encode and decode Base64 strings.
Character Counter
Count characters, words, and lines.
JSON Formatter
Beautify and validate JSON data.
Diff Checker
Compare text or code side-by-side.
Hash Generator
Generate MD5, SHA-1, SHA-256 hashes.
SVG to PNG
Convert SVG code or files to PNG.
URL Parser
Analyze URL components and params.
YAML to JSON
Convert between YAML and JSON.
Image Compressor
Compress PNG, JPG & WebP images locally.
JWT Decoder
Decode and inspect JWT tokens.
UUID Generator
Generate random UUIDs instantly.
Color Converter
Convert colors between HEX, RGB, HSL.
Cron Generator
Build cron expressions visually.
Regex Tester
Test regular expressions live.
CSV to JSON
Convert CSV data to JSON format.
Text Case Converter
Convert between camelCase, snake_case, kebab-case, and more.
HMAC Generator
Generate HMAC-SHA256 and HMAC-SHA512 signatures.
JSON to CSV
Convert JSON data to CSV format.
HTML Beautifier
Beautify and minify HTML code.
Password Generator
Generate secure random passwords.
Slug Generator
Convert text to URL-friendly slugs.
Lorem Ipsum Generator
Generate placeholder text for mockups.
Text Encryption
Encrypt and decrypt text with AES.
Unix Timestamp
Convert timestamps to dates and vice versa.
CSS Minifier
Minify CSS to reduce file size.
QR Code Generator
Generate customizable QR codes instantly.
Age Calculator
Calculate your exact age in years, months, and days.
Date Difference Calculator
Calculate duration between two dates.
ASCII Art Generator
Convert images to ASCII art instantly.
Number Base Converter
Convert between binary, octal, decimal, and hex.
Text to Binary
Convert text to binary and binary back to text.
Box Shadow Generator
Create CSS box-shadow with a live preview.
Loan Calculator
Calculate monthly EMI, total interest, and amortization.
Interest Calculator
Calculate simple and compound interest with contributions.
Loan Prepayment Calculator
See how much you save by prepaying part of a loan.
HTTP Status Codes
Look up any HTTP status code and its meaning.
MIME Types Lookup
Find the MIME type for any file extension.
HTTP Headers Reference
Browse common request and response headers.
User-Agent Parser
Parse a user-agent string into browser and OS.
Line Sorter
Sort, deduplicate, and clean up lists of lines.
Find & Replace
Replace text or regex matches with full control.
Reverse Text
Reverse characters, words, or lines instantly.
Morse Code Translator
Translate text to and from Morse code.
Caesar Cipher
Encode and decode ROT13 and Caesar shift ciphers.
Reading Time Calculator
Estimate reading and speaking time from word count.
Word Frequency Counter
Count and rank the most common words in text.
Text to Speech
Read text aloud using your browser voices.
JSON to TypeScript
Generate TypeScript interfaces from JSON.
JSON to Go
Generate Go structs with json tags from JSON.
JSON to C#
Generate C# classes from JSON payloads.
JSON to XML
Convert JSON into well-formed XML.
JSON Diff
Compare two JSON documents line by line.
XML Formatter
Pretty-print, collapse, or minify XML.
XML to JSON
Convert XML documents into JSON.
TOML / YAML / JSON Converter
Convert between TOML, YAML, and JSON.
CSV to Markdown
Turn CSV data into Markdown tables.
JS Minifier
Minify JavaScript by stripping comments and whitespace.
HTML Minifier
Compress HTML by removing comments and whitespace.
CSS Beautifier
Reformat minified or messy CSS into readable rules.
SQL Formatter
Pretty-print SQL with configurable casing and indent.
Markdown Previewer
Live-render GitHub-flavored Markdown side by side.
Markdown to HTML
Convert Markdown into clean HTML.
HTML to Markdown
Convert HTML into clean Markdown.
HTML Entity Encoder
Encode and decode HTML entities.
Code to Image
Render a code snippet as a shareable SVG card.
Unit Converter
Convert length, weight, temperature, volume, and more.
Percentage Calculator
Calculate percentages, ratios, and percent change.
Tip Calculator
Split bills and calculate tips for any group size.
Scientific Calculator
Evaluate expressions with trig, logs, and powers.
Bitwise Calculator
AND, OR, XOR, NOT, shifts, and arithmetic on integers.
Statistics Calculator
Mean, median, mode, standard deviation, and more.
Roman Numeral Converter
Convert numbers to and from Roman numerals.
Currency Converter
Convert between major world currencies.
Compound Interest Calculator
Project compound growth with optional contributions.
SIP Calculator
Project the future value of monthly investments.
Tax Calculator
Add or extract sales tax and VAT from any amount.
Password Strength Checker
Estimate password strength and crack time.
Bcrypt Hash Generator
Hash and verify passwords with bcrypt.
JWT Signer
Sign HS256 and HS512 JSON Web Tokens locally.
Random Number Generator
Generate cryptographically strong random numbers.
Random Color Generator
Generate random colors in HEX, RGB, or HSL.
CIDR / Subnet Calculator
Compute network, broadcast, mask, and host range.
IP Address Info
Inspect IPv4 and IPv6 addresses with details.
HTTP Request Tester
Send GET, POST, PUT, DELETE requests and inspect responses.
Barcode Generator
Generate barcodes in CODE128, EAN, UPC, and more.
Fake Data Generator
Generate names, emails, UUIDs, and other sample data.
CSS Gradient Generator
Build linear and radial CSS gradients visually.
WCAG Contrast Checker
Test color contrast against WCAG AA and AAA.
Color Palette Generator
Build harmonious palettes from any base color.
Favicon Generator
Create favicons in every standard size from one image.
Image Resizer
Resize images by dimensions or percentage.
Image Format Converter
Convert between PNG, JPEG, and WebP.
EXIF Metadata Viewer
Inspect EXIF data from JPEG and TIFF images.
Image to Base64
Convert images to Base64 data URIs.
BMI Calculator
Calculate Body Mass Index from height and weight.
Calorie Calculator
Estimate BMR, TDEE, and daily macros.
Time Zone Converter
See one moment across major world time zones.
Pomodoro Timer
Focus in 25-minute sprints with structured breaks.
Countdown Timer
Count down to any future date and time.
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Master the CSS box-shadow property. Learn offset, blur, spread, inset, and layered shadows, then generate production-ready code with a live preview.
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Learn the difference between simple and compound interest, how compounding frequency matters, and how to project your savings with a free interest calculator.
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