TetraKits
Free tools & React UI components
Powerful tools.
Ship-ready UI.
Create QR codes, manage PDFs, run calculations, and copy premium React + Tailwind components. Free forever, private by design, and ready on any device.
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TetraKits UI
React + Tailwind · Copy & paste
TetraKits UI Library
68+ copy-paste React components with GSAP motion footers, bento grids, hero sections, buttons, backgrounds, and CTAs. Live previews, TypeScript source, npm install notes, and AI prompts for Next.js, Vite, and Cursor.
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Hero Sections
Dark aurora, minimal startup, and split product heroes.
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Footer Components
GSAP motion footer, neo-minimal, wave, and wordmark layouts.
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Feature Sections
Bento grids, split layouts, and 21st.dev-style blocks.
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Buttons & Cards
Magic UI shiny buttons, glass cards, and interactive pills.
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Backgrounds
Animated grids, starfields, aurora mesh, and CRT scanlines.
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Full UI Library
68 components across 9 categories. Copy TSX and ship fast.
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Investing Dictionary
Learn stocks, crypto, candlestick patterns, and technical analysis with plain-English “What is…” guides. Each term includes definitions, examples, diagrams, and FAQs.
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Compound Interest
How reinvested returns accelerate wealth over decades.
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What Is Ethereum?
Smart contracts, ETH gas fees, and proof-of-stake explained.
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S&P 500 ETF
Passive exposure to 500 large U.S. companies in one ticker.
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What Is a Doji?
Candlestick indecision on full charts with trading context.
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Call Options
Bullish rights, premiums, and covered call basics.
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Inflation
CPI, purchasing power, and why rates matter for markets.
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Full Dictionary
56 terms across stocks, crypto, ETFs, options, and macro.
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QR Code Tools
Generate and scan QR codes for links, WiFi, contacts, and more. Create high-resolution codes in seconds with no account required. New: QR code marketing guide with campaign ideas and free tools.
PDF Tools
Merge, split, compress, and edit PDF files right in your browser. Fast, private, and built for everyday document tasks.
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Merge PDF
Combine multiple PDF files into one document.
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Split PDF
Extract pages from a PDF document.
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Compress PDF
Reduce PDF file size without losing quality.
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PDF to Image
Convert PDF pages to PNG or JPEG.
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Rotate PDF
Rotate all PDF pages 90°–270°.
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Reorder PDF Pages
Drag pages into a new order.
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PDF Watermark
Add text watermark to every page.
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PDF Editor
Edit and add text in PDF documents.
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Image to PDF
Convert JPG and PNG images to PDF.
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Business Tools
Create invoices with inline editing, draw signatures as PNG, and download print-ready PDFs, all in your browser.
Math Calculators
Scientific, fraction, and statistics calculators for homework, engineering, and everyday number crunching. Free and instant.
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Scientific Calculator
Trig, logs, powers, and parentheses.
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Fraction Calculator
Add, subtract, multiply, and divide fractions.
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Average Calculator
Mean, median, mode, and range.
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Standard Deviation
Sample and population std dev.
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Math Symbols
Greek, algebra, and calculus symbols.
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Quadratic Calculator
Solve ax² + bx + c = 0.
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GCF & LCM
Greatest common factor and LCM.
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Ratio Calculator
Simplify ratios to lowest terms.
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Calculators
Grade trackers, mortgage estimates, BMI checks, and financial math. Simple tools that give clear answers without spreadsheets.
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Grade Calculator
Weighted assignment grades.
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GPA Calculator
Semester GPA on the 4.0 scale.
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Final Grade Calculator
Score needed on your final exam.
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Grade ↔ GPA
Convert letter grades and GPA.
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Tip Calculator
Tip, total, and split per person.
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Sales Tax Calculator
Add or remove US sales tax.
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Mortgage Calculator
Monthly payment with tax and PMI.
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Compound Interest
Calculate investment growth over time.
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BMI Calculator
Body Mass Index with healthy range.
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Loan Calculator
Monthly payments and total interest.
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Percentage Calculator
Quick percentage math for any scenario.
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Simple Interest
Calculate interest with I = Prt.
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Discount Calculator
Sale price, savings, and tax.
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Age Calculator
Years, months, and days from birth date.
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VAT Calculator
Add or remove Value Added Tax.
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Binary Converter
Convert decimal, binary, hex, octal.
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Roman Numerals
Number ↔ Roman numeral converter.
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Percent Change
Calculate percent increase or decrease.
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Paycheck Calculator
Estimate net pay after taxes.
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GST Calculator
GST for AU, NZ, IN, and SG.
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Online Tools
Password generator, word counter, words to time calculator, color picker, Base64, notepad, ASCII, and HTML tools. All run in your browser.
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Words to Time Calculator
Convert word count to reading minutes instantly.
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Password Generator
Strong random passwords with strength meter.
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Random Number Generator
Pick numbers in any range.
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Word Counter
Words, sentences, and reading time.
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Character Counter
Twitter, SEO, and SMS limits.
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Case Converter
UPPERCASE, camelCase, snake_case.
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Base64 Encoder
Encode and decode text or files.
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URL Encoder
Percent-encode URLs and queries.
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Color Picker
RGB/HSL sliders and presets.
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Unit Converter
Length, weight, temperature, and more.
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Date Calculator
Add days or find date differences.
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Timer
Countdown with hours and minutes.
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Stopwatch
Lap times with centiseconds.
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Time Calculator
Add, subtract, and duration math.
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World Clock
Live time in cities worldwide.
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Alt Codes
Windows keyboard character reference.
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HTML Entity Codes
Searchable character entity reference.
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Online Notepad
Auto-save notes with word count.
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RGB Color Codes
HEX, RGB, and HSL color picker.
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ASCII Table
Searchable character codes 0–127.
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HTML Editor
Write HTML with live preview.
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HTML Viewer
Paste HTML and view rendered output.
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Hash Generator
MD5, SHA-1, SHA-256 digests in browser.
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JSON Formatter
Format, minify, and validate JSON.
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JWT Decoder
Decode JWT header and payload.
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UUID Generator
Generate RFC 4122 v4 UUIDs.
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Text Diff
Compare two texts line by line.
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Duplicate Line Remover
Remove duplicate lines from lists.
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Line Sorter
Sort lines A–Z or reverse text.
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Lorem Ipsum Generator
Placeholder paragraphs for mockups.
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Reading Time Calculator
Estimate article read time.
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HTML Table Generator
Build tables with live preview.
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