Yaoyorozu Tools

Character Counter

Count characters with full/half-width breakdown, word count, line count, and ...

Whitespace Remover

Remove newlines, spaces, tabs, blank lines, and duplicate lines from text in ...

Twitter (X) Character Counter

Count characters using X (Twitter) rules with weighted CJK characters and URL...

Hashtag Generator

Generate relevant SNS hashtags automatically from keywords you provide.

Text Formatter

Convert between full/half-width, katakana, upper/lower case, and sort lines w...

Text Diff Checker

Compare two texts side by side and highlight additions and deletions in color.

Text Replace

Replace strings in bulk with regex, case sensitivity, and full/half-width opt...

Text to Speech Reader

Read any text aloud in your browser with adjustable speed, pitch, and voice.

Hiragana / Katakana Converter

Convert Japanese text between hiragana and katakana instantly.

URL Extractor

Extract all URLs from any block of text and list them neatly.

Email Address Extractor

Extract all email addresses from a block of text and output a clean list.

Line Shuffler

Shuffle or sort lines randomly to create random orderings of any list.

Character Type Extractor

Extract specific character types such as alphanumeric, hiragana, katakana, or...

JSON Formatter

Format, minify, and validate JSON with syntax highlighting and a tree view.

Base64 Encode/Decode

Encode and decode text or images to and from Base64 format.

URL Encode/Decode

Apply or reverse percent-encoding on URLs and query strings.

Regex Tester

Test regular expressions in real time with capture groups and replace mode.

UUID Generator

Generate RFC 4122 compliant UUID v4 identifiers in bulk.

Password Generator

Create secure passwords with a strength meter and passphrase mode.

QR Code Generator

Create QR codes with custom size, colour, and optional centre logo.

Character Encoding Converter

Convert text between UTF-8, Shift_JIS, and EUC-JP with mojibake recovery.

Markdown to HTML Converter

Convert between Markdown and HTML with GitHub Flavored Markdown support.

CSV to JSON Converter

Convert between CSV and JSON with file upload and download.

Image Resizer

Resize images in the browser with presets for popular SNS platforms.

Image Compressor

Compress images with adjustable quality for smaller file sizes.

YAML to JSON Converter

Convert configuration files between YAML and JSON formats.

XML to JSON Converter

Convert data structures between XML and JSON.

SQL Formatter

Format and prettify SQL queries with keyword highlighting.

SQL INSERT Generator

Generate SQL INSERT statements from tabular data.

Cron Expression Generator

Generate cron expressions from a form with a natural-language description.

Cron Expression Parser

Parse cron expressions and explain them in plain English.

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.

JWT Decoder

Decode JWT header, payload, and signature for inspection.

Image Format Converter

Convert images between PNG, JPEG, and WebP formats.

Image Cropper

Crop images interactively with aspect ratio presets.

Image Rotator

Rotate and flip images directly in your browser.

JSON Diff Tool

Compare two JSON structures with a visual diff view.

TSV to CSV Converter

Convert tab-separated values to and from CSV format.

Meta Tag Generator

Generate HTML meta tags with Google SERP and SNS card preview.

OGP Checker

Check Open Graph Protocol settings of any URL.

HTML Escape Converter

Escape and unescape HTML special characters safely.

robots.txt Generator

Generate robots.txt files for search engine crawler control.

sitemap.xml Generator

Generate sitemap.xml from a list of URLs.

Keyword Density Tool

Analyze keyword frequency with N-gram analysis.

Heading Extractor

Extract h1-h6 headings from HTML for SEO structure check.

IP Address Checker

Display current IP address and browser information.

Title and Description Length Checker

Check title and meta description length with SERP preview.

UTM Parameter Builder

Build URLs with Google Analytics UTM parameters.

FAQ Schema Generator

Generate JSON-LD FAQPage structured data.

Canonical Tag Generator

Generate canonical link tags with URL normalization.

Redirect Rule Generator

Generate .htaccess, nginx, _redirects, and JavaScript redirect rules.

Breadcrumb Schema Generator

Generate JSON-LD BreadcrumbList structured data.

Noindex Meta Generator

Generate meta robots tags for indexing control.

Date Calculator

Date difference, addition, and business day calculation with Japanese holidays.

Age Calculator

Age calculation with Japanese era, zodiac, Chinese zodiac, and school year.

Byte Unit Converter

Convert between B, KB, MB, GB, and TB easily.

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal.

Color Code Converter

Convert RGB, HEX, HSL, and RGBA with a contrast ratio checker.

Unix Timestamp Converter

Convert between Unix timestamp and date with UTC and JST support.

Japanese Era Converter

Convert between Western and Japanese era years.

Bill Splitting Calculator

Split dining bills with flexible rounding options.

Random Number / Lottery Generator

Generate random numbers, roll dice, and run simple lotteries.

Percentage Calculator

Four modes for common percentage calculations.

Time Calculator

Add, subtract, find differences, and sum times in HH:MM format.

Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and Rankine.

Consumption Tax Calculator

Tax-inclusive and exclusive calculation with 8% and 10% rates.

BMI Calculator

BMI calculation with Japan obesity classification.

Second Name Maker

Generate a cool anime-style second name with element and power stats from you...

Title Maker

Generate a funny personal title with level, rarity, and a unique flavor descr...

Self Introduction Maker

Generate a polished self-introduction from your name, hobby, and personal trait.

Daily Fortune Maker

Get your daily fortune with star ratings and lucky items for love, money, wor...

Compatibility Maker

Calculate a fun compatibility score and message for two names.

Handle Name Diagnosis

Analyze your online handle for personality traits and SNS platform fit.

Praise Maker

Generate warm praise messages tailored to the relationship you choose.

Lottery Roulette

Spin an animated roulette to randomly pick one option from your list.

Yes / No Decider

Let fate decide your question with a simple random Yes or No answer.

Punishment Game Roulette

Spin a roulette with 30+ punishment games and adjustable difficulty for party...

Topic Gacha

Pull a random conversation topic from six categories to spark fun group talks.

Team Maker

Fairly divide people into 2 to 10 balanced teams with one click.