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