Building the future,
together through technology.

🔍

QR Code Analyzer

Upload a QR code to analyze and display detailed information such as its error-correction level, version, and mask pattern.

🎨

QR Code EC Tester

Visually test the limits of each error-correction level by masking parts of a QR code to find its readable boundary.

🖼️

Sort Image Visualizer

Upload an image and experience sorting algorithms in motion through sight and sound. Supports 8 different algorithms.

✨

PixelPurge

A free tool that merges fine color speckles and noise in AI-generated images into solid regions. It runs entirely in your browser, so your images are never uploaded.

🌐

Browser Info Viewer

A free tool that shows your browser type and version, screen/window size, IP, language, time zone, GPU, and more, all on one screen.

⬛

QR Code Generator

Generate QR codes from URLs or text. Fine-tune the error-correction level, version, size, margin, and color, then download as PNG or SVG.

Barcode Generator

Generate CODE128, EAN/JAN, UPC, CODE39, and other barcodes. Set bar width, height, color, and margin, then download as PNG or SVG.

🖨️

Free Learning Posters

Free, printable posters for students that explain how QR codes, barcodes, and IP addresses work, in one page each. (Posters are in Japanese.)

🧮

Subnet Calculator

From an IPv4 address and CIDR/mask, compute the network, broadcast, host range, and host count.

🔠

Character Counter

Paste text to instantly count characters (with/without spaces), words, lines, and bytes.

🔑

Password Generator

Generate strong random passwords with a secure RNG; choose length and character types, then copy.

🔣

Base64 Encode / Decode

Convert text to and from Base64. UTF-8 safe (Japanese, emoji) with optional URL-safe output.

🧾

JSON Formatter & Validator

Paste JSON to pretty-print or minify. Syntax errors are reported with line and column.

🆔

UUID Generator

Generate v4 UUIDs in bulk with a secure RNG. Options for uppercase, no hyphens, and braces.

🎨

Color Code Converter

Convert between HEX, RGB and HSL with a large live preview. Copy any notation in one click.

🔗

URL Encode / Decode

Percent-encode and decode text for URLs — safe for Japanese and symbols.

⏱️

Unix Time Converter

Convert between Unix timestamps and dates: seconds/ms, time zone and ISO 8601.

🔐

Hash Generator (SHA)

Compute SHA-1/256/384/512 hashes from text in the browser via Web Crypto.

🔀

Text Diff

Compare two texts and highlight added and removed lines.

🪪

JWT Decoder

Decode a JWT's header and payload and pretty-print claims like exp.

🏷️

HTML Escape / Unescape

Convert <, >, &, ", ' to and from HTML entities — handy for posting code.

🔤

Case Converter

Convert text between camelCase, snake_case, kebab-case and more.

🔢

Number Base Converter

Convert between binary, octal, decimal and hex — accurate via BigInt.

📃

Lorem Ipsum Generator

Generate Lorem ipsum placeholder text by paragraphs, sentences or words.

⚙️

Regex Tester

Test a regex against sample text with live match and group highlighting.

📊

CSV ⇄ JSON Converter

Convert between CSV and a JSON array, with header and delimiter options.

📋

Line Tools

Sort lines, remove duplicates, drop blank lines and trim whitespace.