Free Online Developer Tools & Web Utilities

Fast, private, browser-based tools for developers and everyone else. No sign-up required — your data never leaves your browser.

✨ Everyday Tools

QR codes, Secret Santa, dates, percentages, units, passwords, and word counts

📱
QR Code Generator
Create QR codes for links, Wi-Fi, contacts, email, SMS and SEPA payments — free, never expire
🎁
Secret Santa Generator
Draw names with exclusions and wish lists, send private links — no sign-up
📅
Date Calculator
Days between two dates, business days, and adding or subtracting days
%
Percentage Calculator
Percent of a number, change, reverse percentage and difference, with working
📐
Unit Converter
Length, weight, temperature, volume, pressure, energy, fuel economy and more — or type "5 ft 10 in to cm"
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Password Generator
Generate strong, cryptographically secure random passwords
🔢
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading time

⚡ Developer Tools

Format, validate, encode, and transform data — plus tools for your website

{ }
JSON Formatter & Validator
Pretty-print, validate, and minify JSON data
🔤
Base64 Encoder/Decoder
Encode and decode Base64 strings with UTF-8 support
#️⃣
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
🔗
URL Encoder/Decoder
Percent-encode and decode URLs and query strings
🆔
UUID Generator
Generate UUID v4, v7, v1 and v5 in bulk, or decode any UUID
🔍
Regex Tester
Test regular expressions with live highlighting and match details
📄
Markdown Preview
Write Markdown and see rendered HTML in real time
📊
Diff / Text Compare
Compare two texts line by line with color-coded diff output
🏷️
HTML Entity Encoder/Decoder
Encode and decode HTML entities with named entity support
🔐
JWT Decoder
Decode and inspect JSON Web Token header, payload, and claims
🎯
CSS Minifier / Beautifier
Minify CSS for production or beautify it for readability
📦
JS Minifier / Beautifier
Minify JavaScript for production or beautify for readability
🗄️
SQL Formatter
Format, beautify, or minify SQL queries
⏰
Cron Expression Generator
Build cron schedule expressions with a visual editor
🤖
robots.txt Generator
Create robots.txt files with AI crawler blocking support
🏷️
Meta Tag Generator
Generate SEO meta tags, Open Graph, and Twitter Card tags
👁️
Open Graph Preview
Preview how your page looks when shared on social media
⚙️
.htaccess Generator
Generate .htaccess rules for redirects, security, caching, and CORS
📡
HTTP Header Analyzer
Analyze HTTP response headers for security and best practices
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Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation
🖼️
Base64 Image Encoder
Convert images to Base64 data URIs for embedding in HTML/CSS
🌐
Favicon Generator
Create favicons from text, emoji, or images with ICO and PNG export
📋
Privacy Policy Generator
Generate a customizable privacy policy for your website

📝 Text Tools

Convert, compare, sort, and clean up text

🔠
Case Converter
Convert text between UPPER, lower, Title, camelCase, snake_case, and more
🔎
Find & Replace
Search and replace text with regex support and live highlighting
↕️
Sort Lines
Sort lines alphabetically, numerically, by length, or randomly
🧹
Remove Duplicate Lines
Remove duplicate lines from text with flexible matching options
🔗
Slug Generator
Convert any text into a clean, URL-friendly slug
📜
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words

🎨 Color Tools

Pick, convert, and generate color palettes

🎨
Color Picker & Converter
Convert colors between HEX, RGB, and HSL
🌈
Color Palette Generator
Generate harmonious palettes using color theory
♿
Color Contrast Checker
Check WCAG accessibility contrast ratios
🌅
CSS Gradient Generator
Create linear, radial, and conic CSS gradients

🔢 Math & Conversion

Timestamps, number systems, and data sizes

⏱️
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates
🔄
Number Base Converter
Convert between decimal, binary, octal, and hexadecimal
💾
Byte / Data Size Converter
Convert between bytes, KB, MB, GB, TB, and PB

About WebUtil.io

WebUtil.io is a collection of free, fast, and private online tools for developers and web users. Every tool runs entirely in your browser — no data is ever sent to our servers. No account needed, no limitations, completely free.

Why Use WebUtil.io?

  • 100% Private — All processing happens in your browser. Your data never leaves your device.
  • No Sign-Up — Every tool is available instantly, no registration required.
  • Lightning Fast — Client-side tools with zero server round-trips mean instant results.
  • Mobile Friendly — All tools work on desktop, tablet, and mobile devices.
  • Free Forever — Core tools will always be free to use.
WebUtil.io

Free, private, browser-based tools for developers and everyone else.

Everyday Tools

Developer Tools

Text Tools

Color Tools

Math & Conversion

About