Guide

Choose a tool, paste or enter your data, and use the result immediately. Most processing happens in your browser.

Available tools

Browse all 151 tools grouped by category. Filter by keyword or jump straight to a category to find what you need.

Tool	Category	Description
Encoding6 tools
Base64 Encode / Decode	Encoding	Encode text to Base64 or decode Base64 back to plain text.
URL Encode / Decode	Encoding	Encode and decode URLs with percent encoding.
Morse Code Converter	Encoding	Convert text to Morse code and Morse code back to text.
ROT13 Converter	Encoding	Transform text with the ROT13 substitution cipher.
JWT Decoder	Encoding	Decode JSON Web Token headers and payloads.
JWT Generator	Encoding	Generate a JSON Web Token (JWT) from a header, payload, and signing secret.
JSON7 tools
JSON Formatter	JSON	Format, pretty-print, and validate JSON in your browser.
JSON YAML Converter	JSON	Convert JSON and YAML configuration data both ways.
JSONPath Extractor	JSON	Extract values from JSON with JSONPath expressions.
JSON Validator	JSON	Validate JSON syntax and pinpoint errors with clear location hints.
JSON Minifier	JSON	Remove whitespace and line breaks from JSON to reduce its size.
JSON Viewer	JSON	Visualize JSON as an interactive collapsible tree view.
JSON Expected-Value Validator	JSON	Validate multiple JSON test cases in bulk against a schema and expected values defined in CSV.
Text18 tools
Text Counter	Text	Count characters, lines, words, and bytes in real time.
Remove Newlines	Text	Remove or replace line breaks from text in one step.
Remove Duplicate Lines	Text	Remove duplicate lines and keep only unique text lines.
Case Converter	Text	Convert text between upper case, lower case, camelCase, snake_case, and more.
Line Sorter	Text	Sort text lines ascending, descending, or randomly.
SQL Formatter	Text	Format SQL queries for readability.
Text Reverser	Text	Reverse text by character or by line.
Highlight Duplicate Lines	Text	Find and highlight duplicate lines in text.
Trim Whitespace	Text	Remove leading and trailing whitespace from text.
Text Repeater	Text	Repeat text a specified number of times.
Add Line Numbers	Text	Add line numbers to each line of text.
Text Wrapper	Text	Wrap text at a specified character width.
Full-width / Half-width Converter	Text	Convert Japanese full-width and half-width characters.
Hiragana / Katakana Converter	Text	Convert Japanese text between hiragana and katakana.
Invalid Character Checker	Text	Detect platform-dependent or problematic characters in text.
Lorem Ipsum Generator	Text	Generate placeholder text for layout and design testing.
Text Statistics	Text	Analyze frequent words and character usage in text.
Git Command Cheat Sheet	Text	A searchable, filterable reference of common Git commands: setup, branching, remotes, undo, stash, and more.
Generators22 tools
UUID Generator	Generators	Generate UUID v4 values instantly.
SHA-256 Hash Generator	Generators	Generate SHA-256 hashes for text.
Password Generator	Generators	Generate strong random passwords with custom options.
Color Code Converter	Generators	Convert color values between HEX, RGB, and HSL.
QR Code Generator	Generators	Generate downloadable QR codes from text or URLs.
QR Code Scanner	Generators	Scan QR codes in real time using your camera, or decode QR codes from image files.
Random String Generator	Generators	Generate random strings with custom length and character sets.
Random Number Generator	Generators	Generate random numbers within a specified range.
Color Palette Generator	Generators	Generate color palettes randomly or from a base color.
ULID Generator	Generators	Generate sortable unique ULID identifiers.
SHA-512 Hash Generator	Generators	Generate SHA-512 (or SHA-384) hashes for text.
MD5 Hash Generator	Generators	Generate an MD5 hash for text.
bcrypt Generator	Generators	Generate and verify bcrypt password hashes.
HMAC Generator	Generators	Generate HMAC values from text and a secret key. Supports SHA-1, SHA-256, SHA-384, and SHA-512.
Checksum Calculator (CRC16 / CRC32)	Generators	Calculate CRC-16, CRC-32, Adler-32, and Sum-8 checksums from text in one click.
Password Strength Checker	Generators	Check your password's strength in real time — no data sent to any server.
UUID v7 Generator	Generators	Generate sortable UUID v7 identifiers with millisecond-precision timestamps.
UUID Validator	Generators	Validate UUID format and inspect version, variant, and embedded timestamps.
Slug Generator	Generators	Convert any text into a URL-safe slug with customizable separator and case options.
TOTP Generator	Generators	Generate two-factor authentication (TOTP) one-time passcodes from a Base32 secret key, entirely in your browser.
Color Contrast Checker	Generators	Calculate the contrast ratio between a text color and a background color, and check whether it meets WCAG 2.1 AA and AAA standards. Helps you choose accessible color combinations.
AES Encrypt / Decrypt	Generators	Encrypt and decrypt text with AES-GCM or AES-CBC using a passphrase. The salt and IV are generated automatically and embedded in the ciphertext, so decryption only needs the passphrase.
Calculators15 tools
Number Base Converter	Calculators	Convert numbers between binary, octal, decimal, and hexadecimal.
BMI Calculator	Calculators	Calculate BMI and ideal body weight from height and weight.
Percentage Calculator	Calculators	Calculate percentages, increases, decreases, and discounts.
Unit Converter	Calculators	Convert length, weight, temperature, and other units.
Tax Calculator	Calculators	Calculate tax-included and tax-excluded prices.
Loan Calculator	Calculators	Estimate monthly payments and total repayment for a loan.
CIDR Calculator	Calculators	Calculate network address, broadcast, subnet mask, and usable hosts from an IP/CIDR.
IPv4 Range Expander	Calculators	Expand an IP address range or CIDR block into a full list of individual IPv4 addresses. Copy or download as text.
Subnet Calculator	Calculators	Divide an IP network into subnets by specifying the number of subnets or required hosts per subnet. Supports VLSM (Variable Length Subnet Masking).
Chmod Calculator	Calculators	Set file permissions with checkboxes and convert between octal notation, symbolic notation, and a chmod command.
IBAN Validator	Calculators	Check the format and mod-97 checksum of an International Bank Account Number (IBAN).
IPv4 Address Converter	Calculators	Convert an IPv4 address between dotted decimal, decimal integer, hexadecimal, octal, and binary notation.
MAC Address Generator	Calculators	Generate random MAC addresses with separator, OUI, and multicast/locally-administered bit options.
IPv6 ULA Generator	Calculators	Generate an RFC 4193-compliant IPv6 Unique Local Address (ULA).
Random Port Generator	Calculators	Generate random, non-duplicate port numbers within well-known, registered, dynamic, or custom ranges.
Web13 tools
User Agent Parser	Web	Parse user agent strings to inspect browser, OS, and device details.
Meta Tag Generator	Web	Generate SEO, Open Graph, and social sharing meta tags.
Email Normalizer	Web	Normalize email addresses by lowercasing, stripping +tags, and removing Gmail dots, then detect duplicates.
URL Parser	Web	Break a URL down into its protocol, host, path, query parameters, and more.
Query String Parser	Web	Break a query string down into key-value pairs and view it as JSON.
Query String Builder	Web	Build a URL-encoded query string from key-value pairs.
HTTP Status Code Lookup	Web	A searchable quick reference for HTTP status code meanings.
MIME Type Lookup	Web	A searchable quick reference for file extensions and MIME types.
Cookie Parser	Web	Parse a cookie string into key-value pairs or individual attributes.
CORS Headers Checker	Web	Simulate browser CORS evaluation from request and response headers, including preflight detection.
HTTP Header Builder	Web	Build HTTP request headers from common presets and export as fetch, curl, or raw HTTP.
Curl to Fetch Converter	Web	Convert a curl command into JavaScript fetch() code.
Basic Auth Header Generator	Web	Generate or decode an HTTP Basic Authentication Authorization header from a username and password.
YAML3 tools
YAML Formatter	YAML	Format and validate YAML with consistent indentation and optional key sorting.
YAML Validator	YAML	Validate YAML syntax and pinpoint errors with clear line references.
Properties to YAML	YAML	Convert .properties files to YAML with optional dot-key expansion. Also supports YAML → Properties.
TOML2 tools
TOML Formatter	TOML	Format and validate TOML with consistent structure and optional key sorting.
TOML Validator	TOML	Validate TOML syntax and pinpoint errors with clear line references.
XML5 tools
XML Formatter	XML	Format and minify XML for readability and validation.
XML Validator	XML	Validate XML syntax and pinpoint errors with clear location hints.
XML Minifier	XML	Remove whitespace and line breaks from XML to reduce its size.
XML to JSON	XML	Convert XML data into JSON format.
JSON to XML	XML	Convert JSON data into XML format.
SQL4 tools
SQL Minifier	SQL	Remove whitespace, line breaks, and comments from SQL to reduce its size.
SQL Validator	SQL	Check SQL for balanced parentheses, closed quotes, and basic syntax consistency.
SQL Pretty Print	SQL	Break SQL into readable lines with clause-based line breaks and indentation.
SQL Comment Remover	SQL	Remove line comments (--) and block comments (/* */) from SQL.
Regex5 tools
Regex Tester	Regex	Test regular expressions and highlight matches in real time.
Regex Replace Tester	Regex	Test regex search and replace in real time with match highlights and capture group details.
Regex Explain	Regex	Break down a regex pattern into color-coded tokens with plain-language explanations for each part.
Regex Escape	Regex	Automatically escape regex metacharacters in a string for safe use in patterns.
Regex Cheat Sheet	Regex	A searchable quick reference for regex syntax — click any card to copy.
Date & Time8 tools
Unix Timestamp Converter	Date & Time	Convert between Unix timestamps and human-readable dates.
Cron Expression Generator	Date & Time	Create cron expressions and preview their schedules.
CRON Expression Parser	Date & Time	Parse a CRON expression into plain English and display the next scheduled run times. Includes a built-in syntax reference.
Date Calculator	Date & Time	Calculate date differences and dates after a specified number of days.
Date & Time Difference Calculator	Date & Time	Calculate the exact difference between two dates and times in years, months, days, hours, minutes, and seconds. Supports workday calculation.
Time Calculator	Date & Time	Add and subtract hours and minutes.
Time Zone Converter	Date & Time	Convert a date and time to multiple time zones at once. Supports major world time zones including JST, UTC, EST, and CET. Daylight Saving Time is handled automatically.
Japanese Era Converter	Date & Time	Convert between the Western (Gregorian) calendar and the Japanese era calendar (Meiji, Taisho, Showa, Heisei, Reiwa) in both directions. Automatically detects invalid dates that fall outside an era's actual range.
Markdown3 tools
Markdown to HTML Preview	Markdown	Preview Markdown as HTML in real time.
Markdown to HTML Converter	Markdown	Convert Markdown to HTML and get the raw source code. Supports full HTML document output, GFM, and file download.
HTML to Markdown Converter	Markdown	Convert HTML into Markdown. Supports headings, lists, tables, code blocks, and more.
CSV4 tools
JSON CSV Converter	CSV	Convert between JSON and CSV table data.
CSV Viewer	CSV	Paste or upload CSV / TSV data and view it as a sortable, searchable table.
CSV Formatter & Cleaner	CSV	Format and clean CSV data — convert delimiters, trim whitespace, remove empty or duplicate rows, and convert to Markdown tables.
CSV Validator	CSV	Validate CSV structure and data types, with per-cell error highlighting. Checks column counts, data types, empty rows, and duplicate headers.
HTML / CSS5 tools
HTML Escape / Unescape	HTML / CSS	Escape and unescape HTML special characters such as <, >, and &.
HTML Entity Encode / Decode	HTML / CSS	Encode and decode HTML entities.
CSS Gradient Generator	HTML / CSS	Create linear and radial CSS gradients visually.
HTML Minifier	HTML / CSS	Minify HTML by removing comments, collapsing whitespace, and optimizing attributes.
CSS Minifier	HTML / CSS	Minify CSS by removing comments, collapsing whitespace, shortening colors, and removing zero units.
Diff5 tools
JSON Diff	Diff	Compare two JSON objects and display added, removed, and changed keys in a tree view.
JSON Patch Generator	Diff	Compare two JSON values and generate an RFC 6902 JSON Patch (add / remove / replace) automatically.
Text Diff	Diff	Compare two texts and show their differences.
YAML Diff	Diff	Compare two YAML documents and display added, removed, and changed keys in a tree view.
List Comparer	Diff	Compare two lists and compute their intersection, union, and differences. Options let you control case sensitivity and how whitespace and blank lines are handled.
Properties Files1 tool
.properties File Formatter	Properties Files	Format and clean Java .properties files, with options to sort keys, remove duplicates, and convert to YAML or JSON.
JavaScript4 tools
JS Minifier	JavaScript	Minify JavaScript by removing comments, whitespace, and newlines. Supports console.* removal and variable name mangling.
JS Beautifier	JavaScript	Beautify and format minified or obfuscated JavaScript. Customize indent style and quote style.
JSON5 to JSON	JavaScript	Convert JSON5 (with comments, trailing commas, unquoted keys) to standard JSON. Supports single-quoted strings and hex literals.
JS Obfuscator	JavaScript	Obfuscate JavaScript code to make it harder for third parties to read and analyze. Supports multiple options including string array extraction, control flow flattening, and self-defending code.
Code Generation6 tools
JSON to Go Struct	Code Generation	Generate Go struct definitions from JSON.
JSON to Rust Struct	Code Generation	Generate Rust struct definitions from JSON, with serde attributes and Option<T> support.
JSON to TypeScript Interface	Code Generation	Generate TypeScript interface or type definitions from JSON. Handles nested objects, arrays, and null values.
JSON to Java Class	Code Generation	Generate Java class definitions from JSON. Supports nested objects, arrays, Lombok annotations, Jackson @JsonProperty, and auto-generated getters/setters.
JSON to C# Class	Code Generation	Generate C# class definitions from JSON. Supports nested objects, arrays, namespaces, JsonPropertyName attributes, nullable types, and record syntax.
JSON to Python Dataclass	Code Generation	Generate Python dataclass definitions from JSON. Supports nested objects, arrays, Optional types, frozen, slots, and from_dict() method generation.
Image15 tools
Image Converter (PNG / JPEG / WebP)	Image	Convert images between PNG, JPEG, and WebP entirely in your browser. Nothing is sent to a server.
Image Compressor	Image	Reduce image file size by adjusting quality. Supports JPEG, WebP, and PNG.
Image Resizer	Image	Resize images to an exact width and height in pixels, with optional aspect-ratio lock.
Image Base64 Encoder / Decoder	Image	Convert an image to a Base64 (Data URI) string, or decode a Base64 string back into an image.
Favicon Generator	Image	Generate favicon.ico and all common favicon PNG sizes from a single image, plus a ready-to-use HTML snippet.
Image Cropper	Image	Crop an image by dragging to select an area, with optional aspect-ratio locking.
Color Picker	Image	Click anywhere on an image to sample its color as HEX, RGB, and HSL.
Dominant Color Extractor	Image	Automatically extract a color palette of dominant colors from an image.
Image Metadata Viewer (EXIF)	Image	View Exif metadata embedded in a JPEG — date taken, camera model, GPS location, and more.
SVG Optimizer	Image	Shrink SVG code using SVGO — the industry-standard optimization engine — right in your browser.
Grayscale Converter	Image	Convert an image to grayscale, with adjustable intensity.
Image Rotator / Flipper	Image	Rotate an image in 90-degree steps, or flip it horizontally or vertically.
Image Dimensions Viewer	Image	Instantly view an image's width, height, aspect ratio, and megapixel count.
Aspect Ratio Calculator	Image	Calculate the aspect ratio from a width and height, or work out a dimension from a ratio.
SVG Preview	Image	Safely preview SVG code and check its width, height, and viewBox.
No tools match your filter. Try a different keyword or category.