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Tools / Developer
DEVELOPER

Developer Tools

16 free tools, all running entirely in your browser.

Free tools for encoding and data formats, security tokens and hashing, text comparison, cron scheduling, and everyday developer utilities — the kind of quick checks that would otherwise mean opening a terminal or writing a one-off script.

Encoding & Data Formats

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JSON Formatter & Validator

Pretty-print JSON and catch syntax errors instantly.
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Base64 Encoder / Decoder

Convert text to and from Base64, free — encode or decode instantly.
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URL Encoder / Decoder

Percent-encode or decode URLs and query strings.
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HTML Entity Encoder/Decoder

Convert special characters to HTML entities, or decode entities back to text.
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JSON to TypeScript Interface Generator

Convert a JSON sample into a TypeScript interface, free — including nested objects and arrays.

Security & Tokens

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JWT Decoder

Inspect the header and payload of any JWT.
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Hash Generator

Generate SHA-1, SHA-256, or SHA-512 hashes of any text.
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Password Generator

Generate a strong, random password with adjustable length and character sets.
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UUID Generator

Generate RFC 4122 v4 UUIDs, one or in bulk.
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Credit Card Number Validator

Check whether a card number is structurally valid (Luhn checksum) and which network it matches — not whether it’s a real, active card.

Text & Comparison

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Regex Tester

Test a regular expression against sample text and see every match.
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Text Diff Checker

Compare two blocks of text and see what changed, line by line.

Scheduling

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Cron Expression Parser

Turn a cron expression into a plain-English description.
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Cron Expression Generator

Pick a schedule and get the cron expression, no syntax memorization needed.

Utilities

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Unix Timestamp Converter

Convert between epoch time and human-readable dates.
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Random Number Generator

Generate one or more random numbers within a range you set.

Looking for something else?

Browse all 166 tools, or use the search box on the homepage to find a specific one.