214 free tools · nothing ever leaves your browser
Free online tools that just work
Calculators, converters, text utilities, developer helpers and generators — all in one fast, private place. No sign-up, no uploads, no clutter.
Most used tools
The ones people open again and again.
Avatar Generator
Generators
Create a simple initials-based avatar image with a custom background colour — perfect for placeholder profile pictures.
Open toolBarcode Generator
Generators
Generate a scannable Code 128, EAN-13, UPC-A or Code 39 barcode from any text or number.
Open toolEMI Calculator
Calculators
Calculate your monthly loan instalment, total interest and full repayment schedule for any loan.
Open toolFake Credit Card Number Generator
Generators
Generate Luhn-valid, correctly formatted test card numbers for Visa, Mastercard, Amex and Discover — for testing forms only.
Open toolFancy Text Generator
Text Tools
Turn plain text into bold, italic, script, monospace, small caps, circled and other Unicode styles you can paste anywhere.
Open toolColour Shades Generator
Color Tools
Build a full 50-950 tint and shade scale from one base colour, ready to paste as CSS variables.
Open toolFake Address Generator
Generators
Generate plausible fake street addresses for US, UK or Indian formats to test forms and databases.
Open toolAspect Ratio & Crop Calculator
Calculators
Work out an image or video's aspect ratio, or the crop dimensions needed to hit a target ratio.
Open toolBrowse by category
Eight categories covering everyday maths, writing, design and development.
Text Tools
Count, clean and transform text
27 toolsDeveloper Tools
Format, validate and decode
35 toolsCalculators
Everyday maths and money
36 toolsConverters
Units, data and measurements
18 toolsGenerators
Create data on demand
33 toolsCSS Tools
Visual CSS builders
17 toolsColor Tools
Pick, convert and check
11 toolsDate & Time Tools
Dates, ages and durations
16 toolsImage Tools
Resize, compress and convert
12 toolsPDF Tools
Merge, split and rotate PDFs
9 toolsWhy use PlainToolbox?
Private by design
Nothing is uploaded. Every calculation happens locally in your browser, so even sensitive data stays on your machine.
Instantly fast
Pages are pre-rendered and tools run without a network round trip, so results appear the moment you finish typing.
No sign-up, ever
No accounts, no paywalls, no email capture. Open a tool, get your answer, move on with your day.
One consistent design
Every tool shares the same layout, keyboard shortcuts and copy buttons, so learning one means learning them all.
Every tool on the site
All 214 tools, grouped by what they do.
Text Tools
- Base64 Encoder & Decoder
- Case Converter
- Character Counter
- Fancy Text Generator
- Find and Replace Text
- Invisible Character
- Morse Code Translator
- NATO Phonetic Alphabet Converter
- Number to Words Converter
- Readability Score Calculator
- Recipe Scaler
- Remove Duplicate Lines
- Remove Extra Spaces
- Reverse Text
- ROT13 & Caesar Cipher
- Sentence & Paragraph Counter
- Sort Lines
- Speech Time Calculator
- Syllable Counter
- Text Repeater
- Text to Binary Converter
- Upside Down Text Generator
- URL Encoder & Decoder
- URL Slug Generator
- Word Counter
- Word Frequency Counter
- Zalgo Text Generator
Developer Tools
- Chmod Calculator
- Cron Expression Generator
- CSS Minifier
- CSV to JSON Converter
- Discord Timestamp Generator
- Gitignore Generator
- Hash Generator
- HTML Entity Encoder & Decoder
- HTML Formatter & Minifier
- HTML to Markdown Converter
- HTTP Status Code Lookup
- Image to Base64 Converter
- JavaScript Minifier
- JSON Diff
- JSON Formatter & Validator
- JSON to CSV Converter
- JSON to TypeScript
- JWT Decoder
- Markdown Table Generator
- Markdown to HTML Converter
- Meta Tag & Open Graph Generator
- MIME Type Lookup
- Number Base Converter
- Regex Tester
- Robots.txt Generator
- Roman Numeral Converter
- SQL Formatter
- String Escaper
- Text Diff Checker
- ULID Generator
- URL Parser
- User Agent Parser
- What Is My IP Address
- XML Formatter
- YAML to JSON Converter
Calculators
- Aspect Ratio & Crop Calculator
- Average Calculator
- BMI Calculator
- BMR & Calorie Calculator
- Compound Interest Calculator
- Dimensional Weight Calculator
- Discount Calculator
- Download Time Calculator
- Electricity Cost Calculator
- EMI Calculator
- Final Grade Calculator
- Fraction Calculator
- Fuel Cost Calculator
- GPA Calculator
- GST / VAT Calculator
- Hourly to Salary Converter
- Loan Calculator
- Markup Calculator
- Mortgage Affordability Calculator
- One-Rep Max Calculator
- Online Calculator
- Overtime Calculator
- Paint Calculator
- Pay Raise Calculator
- Percentage Calculator
- Print Size & DPI Calculator
- Profit Margin Calculator
- Running Pace Calculator
- Simple Interest Calculator
- Sleep Calculator
- Square Footage Calculator
- Standard Deviation Calculator
- Timesheet Calculator
- Tip Calculator
- Unit Price Calculator
- Weighted Grade Calculator
Converters
- Area Converter
- Cooking Measurement Converter
- Currency Converter
- Data Storage Converter
- Decimal to Fraction Converter
- Energy Converter
- Fuel Economy Converter
- Height Converter
- Length Converter
- Military Time Converter
- Pressure Converter
- Shoe Size Converter
- Speed Converter
- Temperature Converter
- Time Converter
- Time to Decimal Converter
- Volume Converter
- Weight Converter
Generators
- Avatar Generator
- Barcode Generator
- Business Name Generator
- Coin Flip
- Corporate Job Title Generator
- Dice Roller
- Email Signature Generator
- Fake Address Generator
- Fake Credit Card Number Generator
- Fake Name Generator
- Invoice Generator
- List Randomizer
- Lorem Ipsum Generator
- MAC Address Generator
- Passphrase Generator
- Password Generator
- PIN / OTP Code Generator
- Placeholder Image Generator
- QR Code Generator
- Random Choice Picker
- Random Color Generator
- Random Date Generator
- Random Emoji Generator
- Random IP Address Generator
- Random Letter Generator
- Random Number Generator
- Random String Generator
- Random Team Generator
- Random Username Generator
- Secret Santa Generator
- Strong Password Checker
- UTM Campaign Link Builder
- UUID Generator
CSS Tools
- Border Radius Generator
- Box Shadow Generator
- Clip Path Generator
- CSS Button Generator
- CSS Filter Generator
- CSS Gradient Generator
- CSS Grid Generator
- CSS Specificity Calculator
- CSS Transform Generator
- CSS Triangle Generator
- Cubic Bezier Generator
- Flexbox Generator
- Glassmorphism Generator
- Media Query Generator
- Neumorphism Generator
- PX to REM Converter
- Text Shadow Generator
Date & Time Tools
- Add Business Days to a Date
- Add or Subtract Days
- Age Calculator
- Birth Year Calculator
- Business Days Calculator
- Date Difference Calculator
- Day of the Week Calculator
- Days From Today
- Days Until Calculator
- Hours Calculator
- Korean Age Calculator
- Leap Year Checker
- Time Calculator
- Time Zone Converter
- Unix Timestamp Converter
- Week Number Calculator
Common questions
Is PlainToolbox really free?
Do you upload or store my data?
Do I need to install anything?
Can I use the results commercially?
How do I find a tool quickly?
What is PlainToolbox?
PlainToolbox is an all-in-one digital toolkit designed to simplify your everyday tasks. Whether you want to calculate your age, format CSS code, generate random passwords, or convert file sizes, we provide 214+ fast, secure, and client-side web tools that work instantly inside your browser without saving any data.