Free Online Tools

Evaluate arithmetic expressions and scientific functions. Switch between Simple and Advanced modes for trig, logarithms, powers, and more.

Calculate percentages three ways: find X% of Y, find what % X is of Y, or find the % change between two values.

Compute mean, median, mode, standard deviation, variance, and more from any list of numbers.

Convert between units of length, weight, temperature, area, volume, speed, data, and time.

Pick a color or input a HEX, RGB, HSL, HSV, or CMYK code to get all color format codes instantly.

Convert your GPA between 8 international grading scales: US 4.0, US 4.3, UK degree classification, German, French, Indian, Australian, and percentage.

Generate QR codes and barcodes (Code 128, Code 39, EAN-13, EAN-8, UPC-A, UPC-E) instantly. Download as PNG or SVG.

Generate one or more random numbers within a custom range. Copy results instantly.

Write, format, and edit documents with a Markdown toolbar. Open local files and save as .md or .txt.

Compare two text inputs and see what changed. Word-level or line-level diff with highlighted additions and deletions.

Scramble text randomly (words or characters) or reverse word order. I love you → you love I.

Split text into tokens (words, characters, or lines). Get word counts, token frequency, copy tokens, and analyze in Statistics Calculator.

Generate placeholder text in 8 languages: Lorem Ipsum, English, Vietnamese, French, Spanish, German, Japanese, and Chinese.

Calculate monthly payments, total interest, and view a full payment schedule for any loan or mortgage.

See how your savings grow with compound interest. Add regular contributions and choose compounding frequency.

Calculate the purchasing power of money over time using real inflation rates for 190+ countries. Powered by World Bank CPI data.

Calculate NPV, IRR, and ROI for any set of cash flows. Evaluate investment profitability instantly.

World clock, stopwatch, and countdown timer in one tool.

Convert a date and time across multiple timezones instantly. Supports all IANA timezones.

Convert between Vietnamese lunar calendar and Gregorian calendar dates instantly.

Open and read PDF, Word, Excel, CSV, Markdown, and text files directly in your browser. Desktop-style reader with a navigation sidebar — no upload, no server.

Play audio and video files from your device. Build playlists, shuffle tracks, and control repeat — all in the browser.

View, zoom, rotate, and edit image files from your device. Flip, adjust brightness, contrast, and grayscale — multi-image gallery with thumbnail navigation. No upload, no server.

Paint and draw on a canvas with a full set of tools. Freehand brush, shapes, eraser, text, and custom background color — download as PNG.

Generate formatted academic references in APA, MLA, Chicago, Harvard, IEEE, and Vancouver styles for articles, books, websites, and more.

Send HTTP requests (GET, POST, PUT, PATCH, DELETE) to any URL. Add headers and a request body. All requests run in your browser — no server proxy.

Format, validate, and minify JSON instantly. Choose indentation style and copy the result with one click.

Format, validate, and minify XML instantly. Choose indentation style and copy the result with one click.

Convert between JSON and XML instantly. Paste JSON to get XML, or paste XML to get JSON.

Encode text to Base64 or decode Base64 back to plain text. Handles UTF-8. No server upload.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text. All hashing runs in your browser — no upload.

Generate one or more universally unique identifiers (UUIDs) v4. Copy instantly — standard or compact format.

Convert Unix timestamps (seconds/milliseconds) to ISO 8601, RFC 2822, and human-readable formats. Built for developers.

Remove or replace unwanted characters from any text using a regular expression pattern.

View your public IP address, connection type, downlink speed, RTT, and online status — all connection info in one place.

Look up geolocation, ISP, timezone, and organization for any IPv4 or IPv6 address.

View all system and device information your browser can access: CPU cores, memory, screen resolution, network, timezone, and more.