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48+ tools that run entirely in your browser — no sign-up, no tracking, no data sent anywhere.
See All ToolsPopular Tools
JSON Formatter & Validator
Format, validate, and minify JSON data instantly.
Base64 Encoder & Decoder
Encode text to Base64, or decode Base64 back to plain text. Supports full UTF-8.
UUID v4 Generator
Generate random UUIDs (v4) in bulk with one click.
Password Generator
Generate secure passwords with crypto.getRandomValues(). Length slider, character sets, entropy meter.
JSON to CSV Converter
Convert JSON arrays to CSV format with one click. Supports nested objects.
Regex Tester
Test regular expressions in real-time with match highlighting and capture group display.
Color Picker
Pick colors and convert between HEX, RGB, HSL, CMYK. Check WCAG contrast ratios.
Life Progress Bar — 4000 Weeks
Visualize how much of your life has passed with the 4000 Weeks grid. Enter your age and see your weeks.
Compound Interest Calculator
Calculate compound interest growth and compare it with simple interest and total contributions.
FIRE Calculator (Financial Independence, Retire Early)
Calculate your path to financial independence with the 4% rule, portfolio projections, and withdrawal planning.
QR Code Generator
Generate QR codes for URLs, text, emails, phone numbers, and WiFi credentials. Download as PNG.
Weather Widget
Real-time weather conditions with temperature, humidity, wind speed, and precipitation.
New Tools
View all new toolsHTML Entity Encoder & Decoder
Encode special characters to HTML entities or decode entities back to text.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) — view header, payload, and expiration.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases instantly.
CSS Unit Converter
Convert between px, rem, em, pt, and other CSS units with a configurable base font size.
Image to Base64 Converter
Convert images to Base64 data URLs for embedding directly in HTML or CSS.
PDF to Markdown Converter
Extract text from PDF files and convert to clean Markdown format.
Browse by Category
Formatters
Format and beautify code and data · 1 tool
Encoders & Decoders
Encode and decode data formats · 4 tools
Generators
Generate random data and identifiers · 4 tools
Converters
Convert between data formats · 6 tools
Text Tools
Analyze, clean, and transform text · 7 tools
Calculators
Calculate numbers, dates, and more · 6 tools
Time & Date
Work with timestamps, dates, and time · 5 tools
Finance & Business
Financial calculators and business tools · 3 tools
Image, Color & Design
Color pickers, image tools, and design · 7 tools
Utilities
Everyday utilities and metrics · 5 tools
From the Blog
View all blog postsWhat Is Base64 Encoding and When Should You Use It?
Learn what Base64 encoding is, how it works, and the most common use cases for encoding binary data as text — including data URLs, email attachments, and API payloads.
How to Generate Strong Passwords: A Complete Guide
Learn why strong passwords matter, what makes a password secure, and how to generate unbreakable passwords using cryptographically secure methods.
Understanding UUID v4: When and Why to Use Random Identifiers
Everything you need to know about UUID v4 — how they work, why they are practically unique, and best practices for using them in databases and APIs.
Why QuickNib?
QuickNib provides free, fast, and private online tools for developers, designers, and everyone who works with data. Every tool runs entirely in your browser — your data never leaves your device. No account required, no cookies, no tracking.
Whether you need to format JSON, generate a UUID, encode Base64, convert timestamps, calculate loan payments, or pick the perfect CSS gradient — QuickNib has you covered with 48+ tools and growing.