Free AI & Productivity Tools

71 free browser-based tools organized into 7 categories. All tools run entirely in your browser – your data never leaves your device. No signup, no ads inside the tools, no limits.

AI Tools (2)

• AI Token Counter – Estimate token counts for GPT-4, Claude, Llama, Gemini.
• AI Prompt Builder – Prompt templates with variables, ready for any LLM.

Text Tools (18)

• Word Counter – Count words, characters, sentences, reading time.
• Character Counter – Character counter with platform limits.
• Text Case Converter – UPPERCASE, lowercase, Title Case, camelCase, snake_case.
• Markdown Preview – Live Markdown to HTML preview with GFM support.
• Text Diff – Compare two blocks of text, highlighted differences.
• Remove Duplicate Lines – Remove duplicates with case/trim/sort options.
• Lorem Ipsum Generator – Placeholder text for design mockups.
• URL Slug Generator – SEO-friendly URL slugs from any text.
• Reverse Text – Reverse characters, words, or line order.
• Sort Lines – Sort lines A-Z, Z-A, numeric, by length, or shuffle.
• Shuffle Lines – Randomize the order of lines using cryptographic randomness.
• Find and Replace – Find and replace with regex and case-insensitive options.
• Palindrome Checker – Check if a word or phrase reads the same forward and backward.
• Character Frequency Analyzer – Analyze how often each character appears with frequency chart.
• Whitespace Normalizer – Clean up messy whitespace: trim, collapse spaces, remove empty lines.
• Line Number Adder – Add or remove line numbers from text.
• Text to Speech – Read any text aloud using your browser built-in voices.
• HTML Entity Encoder – Encode special characters to HTML entities and decode back.

Calculators (16)

• Percentage Calculator – 4 percentage operations including change and discount.
• Age Calculator – Exact age in years, months, days from birth date.
• BMI Calculator – Body Mass Index with metric or imperial units.
• Loan Calculator – Monthly payments and amortization schedule.
• Tip Calculator – Tip amount, total bill, split between people.
• Days Between Dates – Days, weeks, months, working days between two dates.
• Discount Calculator – Calculate sale price after percentage discount.
• Compound Interest Calculator – Future value with compounding and monthly contributions.
• Profit Margin Calculator – Profit, margin, and markup from cost and price.
• GPA Calculator – 4.0 scale GPA with credit hours and letter grades.
• Standard Deviation Calculator – Mean, median, variance, standard deviation for any dataset.
• Scientific Calculator – Expression calculator with trig, log, sqrt, constants.
• Sales Tax Calculator – Add or extract tax from any amount at any rate.
• Pay Raise Calculator – Compare old and new salary by percentage or dollar raise.
• Savings Goal Calculator – Monthly savings needed to hit a financial goal by a target date.
• Time Duration Calculator – Duration between two times plus time adjustments.

Converters (16)

• JSON Formatter – Beautify, minify, and validate JSON.
• CSV to JSON Converter – Convert CSV to JSON array with custom delimiters.
• JSON to CSV Converter – Convert JSON array to CSV with auto-header detection.
• Color Converter – Convert between HEX, RGB, HSL color formats.
• Unix Timestamp Converter – Unix seconds or milliseconds to human-readable date.
• YAML to JSON – Convert YAML documents to JSON.
• JSON to YAML – Convert JSON objects to YAML format.
• Temperature Converter – Celsius, Fahrenheit, Kelvin, Rankine.
• Length Converter – Meters, feet, inches, kilometers, miles, and more.
• Weight Converter – Kilograms, pounds, ounces, grams, stones, tonnes.
• Volume Converter – Liters, gallons, cups, fluid ounces, tablespoons.
• Area Converter – Square meters, square feet, acres, hectares.
• Number Base Converter – Binary, octal, decimal, hexadecimal, and custom base 2-36.
• Roman Numeral Converter – Convert between Roman numerals and Arabic numbers.
• Number to Words – Convert numbers to words – cardinal, ordinal, or money.
• Color Contrast Checker – WCAG AA and AAA accessibility contrast ratio checker.

Generators (9)

• Password Generator – Cryptographically secure random passwords with strength analyzer.
• UUID Generator – Random UUID v4 identifiers, single or batch.
• QR Code Generator – Generate QR codes from any text or URL.
• Random Number Generator – Random numbers in any range, unique or with duplicates.
• Hash Generator – SHA-1, SHA-256, SHA-384, SHA-512 hashes for any text.
• Dice Roller – Roll any combination of dice: NdM format.
• Coin Flip – Flip 1 or 10000 coins using cryptographic randomness.
• Gradient CSS Generator – Linear, radial, and conic CSS gradients with live preview.
• Box Shadow Generator – Interactive CSS box-shadow with live preview and inset option.

Dev Tools (7)

• Base64 Encoder/Decoder – Unicode-safe Base64 encode and decode.
• URL Encoder/Decoder – Percent-encode URLs or decode encoded strings.
• JWT Decoder – Decode JSON Web Token header and payload.
• Regex Tester – Live test JavaScript regular expressions.
• HTTP Status Code Lookup – Look up any HTTP status code by number or keyword.
• Cron Parser – Plain-English description of any cron expression.
• User Agent Parser – Parse browser, OS, device, engine from any User-Agent.

Time Tools (3)

• Pomodoro Timer – Work/break timer with customizable cycles.
• Stopwatch – Start, pause, lap, reset. Millisecond precision.
• Countdown Timer – Count down with sound alert when done.

More tools added frequently. Got a request? Let us know.