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Base64・URL・HTML実体参照の変換、JSON・YAML・CSVの変換、正規表現、SQL、cron式の解説、ハッシュ・UUID・パスワードの生成ができます。入力したトークンや設定値はブラウザー内にとどまります。

UUID生成

UUID v4またはv7をまとめて生成し、コピーします。

このカテゴリーのその他のツールは、現在英語で利用できます。

英語で利用できるツール

JSON to TypeScript

Infer TypeScript types from JSON samples, including nested objects and arrays

JSON to XML

Convert JSON to XML with a custom root and explicit array mapping

XML to JSON

Convert XML attributes to @keys and repeated elements to arrays

CSV Column Extractor

Select CSV columns by number, reorder them and optionally drop the first row

IPv4 Subnet Calculator

Calculate IPv4 network boundaries, masks and usable host ranges

robots.txt Generator

Build a robots.txt file with crawler rules and a sitemap location

XML Sitemap Generator

Turn a list of website URLs into a downloadable XML sitemap

CSS Gradient Generator

Preview two-color gradients and copy their CSS background declaration

Box Shadow Generator

Tune a CSS box-shadow for cards, buttons and other interface elements

Base64 Encoder/Decoder

A Base64 encoder and decoder that gets Unicode right

Password Generator

A random password generator built on the browser's crypto RNG

Hash Generator

MD5 and SHA hashes for text and files, computed in the browser

URL Encoder/Decoder

A URL percent-encoder and decoder that handles Unicode and emoji

HTML Entity Encoder/Decoder

Encode and decode HTML entities for special and non-ASCII characters

JWT Decoder

Decode JWT header and payload and check expiry (no signature verification)

JSON Formatter

Beautify, minify and validate JSON, sort keys, errors with line and column

JSON to CSV Converter

Convert a JSON array of objects to CSV (flattening, delimiters, Excel BOM)

CSV to JSON Converter

Convert CSV to JSON (delimiter auto-detect, headers, type conversion, nesting)

JSON to YAML Converter

Convert JSON to YAML (indent choice, key sorting, error positions)

YAML to JSON Converter

Convert YAML to JSON (safe schema, anchors and merge keys, error line)

SQL Formatter

Beautify SQL (MySQL, PostgreSQL and other dialects, keyword case, indentation)

Unix Timestamp Converter

Epoch to date and back (seconds to nanoseconds, free-text dates, period start and end, code samples)

Number Base Converter

Base 2/8/10/16/36 and custom base conversion with BigInt, negatives and 0x/0b/0o prefixes

Color Converter

HEX, RGB, HSL and OKLCH conversion with a preview and WCAG contrast check

Regex Tester

JavaScript regex tester with flags, match highlighting, group table and replace preview

Cron Expression Parser

Cron expression explainer with 5/6 fields, next 5 runs and time zones

URL Parser

URL component breakdown with decoding, IDN hosts and query parameter editing

Charset Converter

A converter that re-encodes text and files between Korean, Japanese and Unicode encodings

Mojibake Fixer

A tool that repairs mojibake by reversing every likely pair of mixed-up encodings

Unicode Normalizer

A Unicode normalization tool for text and file names, including decomposed macOS names

Meta Tag Generator

A generator for search and social sharing meta tags with link preview mock-ups

Punycode Converter

A converter between Unicode domain names and their xn-- Punycode form