Free Online Tools

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 numbers between bases: binary, octal, decimal, hexadecimal, base 32, base 36, and base 64.

Convert between decimal and scientific notation (e.g. 0.000123 ↔ 1.23e-4). Handles very large and small numbers.

Convert between radians and degrees instantly. Essential for trigonometry, math, and physics.

Convert between Arabic numbers (1–3999) and Roman numerals instantly. Supports standard subtractive notation.

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

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.

Type a mail template with {{placeholders}}, upload a CSV with matching columns, and generate one mail body per row. All in your browser.

Create and edit mind maps with nodes and branches. Add, edit, delete nodes; pan and zoom; export as PNG or JSON.

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.

Convert text case with one-click presets (uppercase, lowercase, title, camelCase, snake_case, kebab-case) or use regex to apply case only to matched text.

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

Visualize word frequency as a cloud. Paste text, generate the cloud, and see which words appear most often. Reuses the same tokenization as the Text Tokenizer.

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

Merge multiple PDFs into one, or split a PDF into separate pages. All processing runs in your browser — no upload, no server.

Extract or compress ZIP and GZIP in your browser. No upload, no server.

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.

Read .eml and Outlook .msg email files in your browser. View headers, body, and attachments — 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.

Capture photos and videos with sound from your device camera. All processing runs in the browser — no upload, no server.

Scan QR codes and barcodes with your device camera. All processing in your browser — no upload, no server.

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

Record audio from your microphone. All processing runs in the browser — 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.

Import, search, view, edit, and export your contacts. Supports CSV and JSON. Data stays in your browser.

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 Gregorian, Vietnamese Lunar, Hijri, Hebrew, and Jalali calendar dates instantly.

View any month, week, or day with switchable view modes. Import .ics, add and edit events, then export back.

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.

Format and minify SQL. Choose dialect, indentation, and keyword case. Supports MySQL, PostgreSQL, SQLite, and more.

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.

Convert text to binary (UTF-8) and binary back to text. 8 bits per byte. No server upload.

Encode text to Morse and decode Morse to text. International standard. 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.

Generate secret keys (e.g. SESSION_SECRET, API keys) as random bytes in hex, base64, or base64url. All generation runs in your browser — no upload.

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.

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.

Compute Pearson and Spearman correlation coefficients between two paired datasets. Includes a scatter chart with regression line.

Generate combinations and permutations from a set of items. Supports n choose k, nPr, and arrangements with or without repetition.

Type LaTeX math formulas and see them rendered live. Download the formula as a PNG image.

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

Generate strong passwords with presets or custom formats and optional pattern. All generation runs in your browser — no upload.

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

Check if multiple websites or APIs are live. Enter URLs one per line — all checks run in your browser, no server.

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.

Live device compass and bearing converter. View heading on mobile or convert degrees to cardinal directions.

Test your keyboard and mouse in real time. See key codes, mouse position, clicks, scroll, and modifier keys — all in your browser.

Diagnose display issues: dead pixels, color accuracy, gradients, backlight bleed. View resolution, color depth, and DPI. All in your browser.