Free Online Tools & Mini Apps

Simple, fast, and free tools right in your browser. No downloads, no sign-ups.

Featured Apps

Age Calculator

Calculate your exact age in years, months, and days. See your next birthday countdown and discover fun facts about your birth date.

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Alphabet Learning

Learn letters and sounds with fun interactive games for kids ages 4-6.

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ASCII Text Drawer

Create ASCII art banners from text with selectable fonts.

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Base64 Encoder/Decoder

Encode and decode Base64 strings and files instantly in your browser. Private local processing for text, images, and files.

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Base64 File Converter

Convert files to Base64 and decode Base64 back to downloadable files entirely in your browser.

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Base64 String Converter

Encode plain text to Base64 and decode Base64 back to UTF-8 text instantly in your browser.

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Basic Auth Generator

Generate the full Authorization: Basic header and raw Base64 token from username and password credentials. Fast, secure, and entirely in your browser.

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Bcrypt Hash Generator

Hash passwords with bcrypt, adjust the cost factor, and verify matches locally in your browser.

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Benchmark Builder

Create JavaScript benchmark cases, tune warmup and iterations, and compare browser-run performance side by side.

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BIP39 Mnemonic Generator

Generate and validate English BIP39 seed phrases locally in your browser.

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BMI Calculator

Calculate your Body Mass Index (BMI) and health status with metric or imperial units and WHO categories.

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Calculator

Free online calculator with basic and scientific functions, keyboard input, and local history.

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Camera Recorder

Record webcam video with live preview and download clips locally in your browser.

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Case Converter

Free online tool to convert text between camelCase, PascalCase, SNAKE_CASE, kebab-case, UPPER CASE, and more — right in your browser.

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Chmod Calculator

Convert between numeric and symbolic chmod permissions and copy a ready command.

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Chronometer

Simple stopwatch with lap and split tracking.

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Color Contrast Checker

Check color contrast ratios for WCAG AA/AAA compliance with instant previews, fix suggestions, and shareable checks.

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Color Converter

Convert colors between HEX, RGB, and HSL formats with live JSON output and clipboard helpers.

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Color Picker

Pick colors, extract from local images, generate palettes, check contrast, and build CSS gradients. Supports HEX, RGB(A), HSL(A), HSV, and CMYK.

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Countdown Timer

Free online countdown timer with presets, optional sound alerts, and full-screen mode.

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Crontab Generator

Build cron expressions with a visual schedule builder.

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CSV JSON Converter

Convert between CSV and JSON instantly in your browser. Paste CSV with a header row to get JSON, or paste JSON to get CSV.

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Date Difference Calculator

Calculate the exact time between two dates in years, months, weeks, days, and more.

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Date Time Converter

Convert Unix timestamps into ISO 8601, UTC, local time, and copyable epoch values.

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Device Information

View a live snapshot of your browser, screen, language, timezone, and connection details.

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Diff Checker

Compare two texts side-by-side and instantly see all differences highlighted.

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Docker Run to Compose Converter

Convert a docker run command into starter docker-compose YAML in your browser.

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Email Normalizer

Normalize a single email address for cleaner dedupe and review.

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Emoji Picker

Search a curated emoji set by keyword and copy the matches instantly.

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Text Encryption

Encrypt or decrypt text locally with AES-GCM and a passphrase.

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ETA Calculator

Estimate when something will finish from seconds, duration lines, or progress plus rate.

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4 in a Row

Play the classic Connect Four game against an intelligent AI or challenge a friend. Drop discs to connect four in a row horizontally, vertically, or diagonally.

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Git Memo

Search and copy a curated set of common Git commands.

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Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes instantly from text.

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Hash Text

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text directly in your browser.

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HMAC Generator

Generate HMAC signatures from a message and secret key with SHA-1, SHA-256, SHA-384, or SHA-512.

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HTML Entities Encoder/Decoder

Encode or decode HTML entities instantly, including quotes and numeric entity sequences.

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HTML WYSIWYG Editor

Write and format rich text in a simple browser editor, then copy or download the cleaned HTML fragment.

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HTTP Status Codes

Look up common HTTP status codes or search reason phrases instantly.

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IBAN Validator and Parser

Validate an IBAN, inspect its core parts, and confirm checksum and length rules in the browser.

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Integer Base Converter

Convert signed integers between decimal, hexadecimal, binary, and octal with strict validation in the browser.

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IPv4 Address Converter

Convert dotted IPv4 addresses into decimal, hex bytes, binary, and reversed-octet form.

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IPv4 Range Expander

Expand CIDR blocks and dash ranges into complete IPv4 address lists.

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IPv4 Subnet Calculator

Calculate network, broadcast, subnet mask, and host range from an IPv4 address and CIDR prefix.

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IPv6 ULA Generator

Generate RFC4193 IPv6 Unique Local Address prefixes and /64 subnets in your browser.

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JSON Diff

Compare two JSON documents in your browser, validate syntax, and get a copyable structured diff with stable paths.

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JSON Formatter

Format, minify, and validate JSON with clear error messages and syntax highlighting.

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JSON Minify

Minify JSON by removing whitespace safely in your browser.

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JSON to CSV Converter

Convert JSON arrays to CSV with headers in your browser.

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JSON to TOML Converter

Convert JSON objects and arrays into TOML configuration text in your browser.

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JSON to XML Converter

Convert JSON objects, arrays, and values into well-formed XML in your browser.

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JSON to YAML Converter

Convert JSON objects, arrays, and values into clean YAML in your browser.

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JSON Viewer

View, validate, and explore JSON as a collapsible tree.

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JWT Parser

Decode JWT header and payload locally, inspect claims, and review expiration status without sending tokens to a server.

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Keycode Info

Inspect JavaScript keyboard event values in real time, including key, code, keyCode, and modifier state.

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Kids BMI Calculator

Calculate BMI percentile for children ages 2-19 using CDC growth charts. Get accurate BMI-for-age assessment.

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List Converter

Convert lists between CSV, JSON, and plain text.

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Lorem Ipsum Generator

Generate placeholder text for your designs and mockups. Create paragraphs, sentences, or words instantly.

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MAC Address Generator

Generate random MAC addresses with vendor options.

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MAC Address Lookup

Identify vendors from MAC addresses.

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Markdown Previewer

Live Markdown editor with instant preview. Write and preview GitHub-flavored Markdown in real-time.

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Markdown to HTML

Markdown to HTML: Use this tool to process and transform your data directly in your browser.

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Math Birds

Launch angry birds by solving math problems! An Angry Birds-style game that makes learning addition and subtraction fun for kids.

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Math Evaluator

Math Evaluator: Use this tool to process and transform your data directly in your browser.

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Meta Tag Generator

Generate SEO and social meta tags quickly.

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MIME Types Lookup

Find MIME types by file extension.

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Numeronym Generator

Create numeronyms like i18n or a11y from words.

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OTP Code Generator and Validator

Generate and validate OTP codes (HOTP/TOTP).

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Password Generator

Generate secure, random passwords with customizable options.

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Password Strength Analyser

Analyze password strength with clear feedback.

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PDF Signature Checker

Check whether a PDF contains a digital signature.

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Percentage Calculator

Calculate percentages, percentage change, markup, discount, and more with this free online tool.

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Phone Parser and Formatter

Parse and format phone numbers with country support.

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QR Code Generator

Generate QR codes from text, URLs, WiFi credentials, or contact information. Download as PNG or SVG.

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Random Port Generator

Generate random available-looking port numbers.

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Regex Memo

Handy regex cheat sheet with examples.

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Regex Tester

Test and debug regular expressions with real-time matching, pattern explanation, find & replace, and a built-in cheatsheet.

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Roman Numeral Converter

Convert between Roman numerals and integers.

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RSA Key Pair Generator

Generate RSA public and private key pairs.

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Safelink Decoder

Decode Microsoft Safe Links to reveal the original destination URL without leaving your browser.

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Slugify String

Convert text into clean, URL-friendly slugs instantly in your browser.

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SQL Prettify

Format SQL queries with readable indentation, clause breaks, and keyword casing controls.

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String Obfuscator

Obfuscate text with Base64, ROT13, and masking tools that run entirely in your browser.

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SVG Placeholder Generator

Create lightweight SVG placeholders with custom dimensions, text, colors, and instant preview.

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Temperature Converter

Temperature Converter: Use this tool to process and transform your data directly in your browser.

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Text Case Converter

Convert text between uppercase, lowercase, title case, camelCase, snake_case, and 12 other formats.

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Text Diff

Text Diff: Use this tool to process and transform your data directly in your browser.

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Text Statistics

Text Statistics: Use this tool to process and transform your data directly in your browser.

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Text to Binary Converter

Convert text to binary and binary to text.

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Text to NATO Alphabet

Convert text into NATO phonetic alphabet words.

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Text to Unicode Converter

Convert text to Unicode escape sequences and back.

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Tic Tac Toe

Play the classic Tic Tac Toe game against an intelligent AI or challenge a friend. Three difficulty levels including unbeatable hard mode.

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Time Zone Converter

Convert times between any time zones worldwide. Use natural language prompts or select from searchable dropdowns.

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Tip Calculator

Calculate tips and split bills easily with customizable tip percentages.

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Token Generator

Token Generator: Use this tool to process and transform your data directly in your browser.

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TOML to JSON Converter

Convert TOML configuration to JSON.

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TOML to YAML Converter

Convert TOML configuration to YAML.

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ULID Generator

Generate sortable ULIDs with timestamps and secure randomness. Create single or bulk ULIDs and copy them instantly.

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Unit Converter

Convert between different units of measurement - length, weight, temperature, volume, area, speed, and more.

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URL Encoder

Percent-encode text for safe URLs using encodeURIComponent or encodeURI.

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URL Encoder/Decoder

Encode and decode URLs and special characters instantly with smart URL parsing.

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URL Parser

Parse a URL into protocol, host, port, path, query, and fragment right in your browser.

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User Agent Parser

Parse user agent strings into readable browser, operating system, engine, and device details right in your browser.

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UUID Generator

Generate RFC 4122 UUID v4 values instantly with batch output, formatting options, and one-click copy.

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WiFi QR Code Generator

Generate WiFi QR codes to share network credentials quickly and privately. WPA, WEP, and open-network payloads stay entirely in your browser for homes, offices, and guest networks.

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