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Curated for developers

Built for developers — fast, private, no signup.

JSON, regex, hashes, JWT, Base64, timestamps, UUIDs and the rest of the tools you reach for between commits — all running in your browser, no upload required.

Why this set

These are the converters and inspectors that show up in every code review and bug hunt: pretty-print a payload, decode a token, generate an ID, hash a string. Each tool runs entirely in your browser using native Web APIs (crypto.subtle, JSON.parse, the regex engine), so production payloads never leave your machine — safe to use on customer data without thinking twice.

Data & code

JSON Formatter & Validator

Beautify, minify and validate JSON — free, no signup.

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Data & Code·Structured data

JSON ⇄ XML Converter

Convert JSON to XML or XML to JSON — both directions.

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Data & Code·Structured data

YAML ⇄ JSON Converter

Convert YAML to JSON or JSON to YAML — both directions.

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Data & Code·Structured data

CSV ⇄ JSON Converter

Turn CSV into JSON or JSON into CSV — both directions.

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Data & Code·Structured data

SQL Formatter

Beautify and indent ugly SQL queries.

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Data & Code·Structured data

Regex Tester

Test JavaScript regular expressions live.

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Data & Code·Dev utilities

Encoding & crypto

Base64 Encode / Decode

Encode and decode Base64 — Unicode-safe.

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Encoding & Crypto·Encoders

URL Encode / Decode

Percent-encode and decode URLs safely.

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Encoding & Crypto·Encoders

JWT Decoder

Decode and inspect JWT tokens — locally, never logged.

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Encoding & Crypto·Security

Hash Generator (SHA-1/256/384/512)

SHA-1, SHA-256, SHA-384, SHA-512 — all in browser.

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Encoding & Crypto·Security

HMAC Generator

HMAC-SHA1/256/384/512 with any secret.

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Encoding & Crypto·Security

HTML Entities Encode / Decode

Escape or unescape HTML special characters.

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Encoding & Crypto·Encoders

Hex / Binary / Octal Converter

Convert between hex, binary, octal and decimal.

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Encoding & Crypto·Encoders

Identifiers & utilities

UUID Generator

Generate v4 UUIDs in bulk — cryptographically secure.

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Data & Code·Identifiers

Slug Generator

Turn any text into a URL-friendly slug.

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Data & Code·Identifiers

Lorem Ipsum Generator

Generate placeholder text — paragraphs, sentences or words.

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Text·Analyze

Cron Explainer

Decode cron expressions in plain English.

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Date & Time·Scheduling

Timestamp Converter

Unix timestamps ↔ human-readable dates.

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Date & Time·Clocks

Timezone Converter

Convert times between any two timezones.

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Date & Time·Clocks
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