Free Online Tools for Everyone

Convert between meters, feet, inches, kilometers, miles, and other length units instantly. Fast and accurate length conversion calculator.

Convert between kilograms, pounds, grams, ounces, and other weight units instantly. Accurate weight conversion calculator.

Convert between Celsius, Fahrenheit, and Kelvin temperature scales instantly. Accurate temperature conversion calculator.

Convert between square meters, square feet, acres, hectares, and other area units instantly. Accurate area conversion calculator.

Convert between liters, gallons, cubic meters, cups, and other volume units instantly. Accurate volume conversion calculator.

Convert between miles per hour, kilometers per hour, knots, meters per second, and other speed units instantly.

Convert Unix timestamps (seconds or milliseconds) to readable dates and convert dates back to timestamps. Includes local time, UTC, and ISO 8601 outpu...

Calculate the number of days, weeks, months, or years between two dates. Find out how much time has passed or how long until a future date with our ea...

Add or subtract days, months, or years from any date. Calculate future deadlines, expiration dates, or past dates quickly and accurately with our date...

Calculate your Body Mass Index and get insights into your weight status. Check whether your weight falls within a healthy range based on your height a...

Calculate percentages instantly — find X% of a number, determine what percent one number is of another, or calculate percentage increase and decrease....

Calculate your exact age in years, months, and days from your date of birth. Find out how many days you have been alive or calculate someone's age on ...

Calculate monthly loan payments, total interest, and total repayment for any loan. Suitable for mortgages, car loans, student loans, and personal loan...

Calculate compound interest for long-term investments or reverse-plan how much to invest monthly to reach your financial goal. Perfect for retirement ...

Generate random numbers between any min and max values. Supports batch generation (up to 100 numbers), unique or duplicate modes, and one-click copy. ...

Generate QR codes from text, URLs, or contact info with custom size, margin, and colors. Download your QR code instantly.

Instantly count words, characters, sentences, paragraphs, and lines in any text. Supports English, Chinese, and multilingual content. Get reading time...

Generate strong, secure random passwords with customizable length, uppercase, lowercase, numbers, and special characters. Cryptographically secure pas...

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case instantly. Free online text tr...

Convert colors between HEX, RGB, and HSL formats instantly. Includes a visual color preview swatch and one-click copy for CSS-ready values. Free onlin...

Convert text to Morse code and Morse code back to text instantly. Listen to and download the audio output as a WAV file. Free online Morse code transl...

Format, beautify, and validate JSON data to make it more readable and error-free. Perfect for developers working with APIs, configuration files, and d...

Convert JSON arrays to CSV format and CSV data back to JSON. Supports file download, custom delimiters, and preserves primitive data types.

Convert JSON to YAML and YAML to JSON instantly in your browser. Perfect for Kubernetes manifests, CI/CD configs, and API payloads. Supports clean ind...

Encode text to Base64 or decode Base64 strings back to readable text. Great for data encoding, image handling, and API authentication.

Encode URLs to make them safe for web use or decode encoded URLs back to readable text. Perfect for developers, SEO specialists, and anyone working wi...

Decode and inspect JSON Web Tokens (JWT). View the header, payload, and signature without verifying the signature. Useful for debugging authentication...

Convert numbers instantly between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Perfect for programmers, students, an...

Test and debug regular expressions in real time. Highlight all matches in your text, inspect capture groups, and pick from a library of common pattern...

Compare two text blocks side by side and instantly see additions, deletions, and unchanged lines highlighted. Supports split and unified views.

Parse and explain cron expressions in plain English. View the next scheduled run times and build expressions from common presets. Free online cron job...

Free online image compressor. Reduce PNG, JPEG, WebP, GIF, and BMP file sizes with adjustable quality — 100% in-browser, no upload, no signup required...

Free online image converter. Convert PNG, JPEG, WebP, or AVIF images instantly in your browser — no upload, no file size limits, no signup needed.

Free online image resizer. Set exact pixel dimensions or scale by percentage. Lock aspect ratio, choose output format — all in-browser, no upload need...

Free online image color picker and eyedropper. Upload any image to extract precise HEX, RGB, and HSL color codes. Zoom in for pixel-perfect color samp...

Free online image to Base64 converter. Encode PNG, JPEG, WebP, SVG, and GIF to data URLs instantly — no upload, no signup, works offline in your brows...

Instantly detect your public IPv4 and IPv6 addresses and look up detailed geolocation info — country, city, region, ISP, timezone and more. Also suppo...