Timestamp Converter
Convert Unix timestamps to human-readable dates and back, in seconds or milliseconds. Live epoch clock, ISO 8601, UTC, and any timezone — free and fully in-browser.
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ブラウザ内で動作する無料オンライン developer ツール。
Time Zone Converter
Compare up to 4 time zones side-by-side with a live 24-hour grid. Search by city, country, IANA, or abbreviation (GMT, NPT, IST, EST). Star favorites, pick a meeting time that works everywhere.
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Number Base Converter
Convert binary, decimal, octal, and hexadecimal values with grouped formatting and optional bit-length padding.
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JSON Formatter
Format and beautify JSON with proper indentation.
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IDN Punycode Converter
Convert Unicode domains to punycode and decode punycode back to internationalized domain names.
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UUID Generator
Generate random v4 UUIDs instantly — single or bulk.
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Random Number Generator
Generate random numbers with custom min/max range, decimal precision, and batch output for analytics, testing, and simulations.
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Random String Generator
Create random strings with configurable character sets, optional prefix/suffix, and exclusion of ambiguous characters for safe IDs.
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JWT Decoder
Decode and inspect JSON Web Tokens without verification.
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Regex Tester
Test regular expressions against text with live match highlighting.
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README Badge Generator
Build shields.io badges for npm, GitHub Actions, Docker, PyPI, license, coverage, and custom labels — with live preview and copy-ready Markdown, HTML, or URL output.
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HTML Minifier
Shrink HTML by removing comments, collapsing whitespace, and stripping noise — without breaking the contents of <pre>, <textarea>, <script>, or <style>. Reports byte savings instantly.
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CSS Minifier
Compress CSS by stripping comments, collapsing whitespace, and removing redundant semicolons. Outputs production-ready CSS with byte savings reported.
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JavaScript Minifier
Strip comments and unnecessary whitespace from JavaScript so it ships in fewer bytes — with string and regex literals preserved exactly. Runs entirely in your browser.
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SQL Formatter / Beautifier
Format messy SQL into a readable, standard layout — uppercase keywords, one clause per line, indented JOINs and subqueries. Works with PostgreSQL, MySQL, SQLite, and SQL Server dialects.
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URL Parser
Break any URL into protocol, host, port, path segments, query parameters, and fragment. Includes one-click decoding and a copyable JSON view for debugging redirects, deep links, and tracking URLs.
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User Agent Parser
Paste any User-Agent string and instantly see the browser, engine, OS, device type, and version. Built for log triage, analytics QA, and bug reports.
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JSON Minifier
Strip whitespace from JSON to produce the smallest valid payload. Reports savings in bytes and percentage so you can see the impact instantly.
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Cron Expression Builder & Explainer
Build cron schedules with a step-by-step picker, then read the plain-English explanation, the next runs in any IANA timezone, and ready-to-paste snippets for crontab, Kubernetes CronJob, Spring @Scheduled, AWS EventBridge, and GitHub Actions. Standard, 6-field, and Quartz dialects (with L, W, # specials) all supported.
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