Developer utilities that run in your browser, not on a server.

Developers need fast, trustworthy tools for encoding, formatting, and transforming data. SpecWhale's developer toolkit runs entirely client-side, meaning your API keys, tokens, and private payloads never touch an external server. No rate limits, no login, no subscriptions.

Featured Tools for Software Developers

Zero-upload, 100% private client-side calculators and converters.

JSON Formatter And Validator

Format JSON, validate syntax, and make raw JSON easier to read.

Developer Tools · Text/code

Base64 Encoder Decoder

Encode or decode Base64 text locally -- no data leaves your browser or gets uploaded.

Developer Tools · Text/code

URL Encoder Decoder

Encode or decode URL components (percent-encoding) for query strings and paths.

Developer Tools · Text/code

UUID Generator

Generate RFC 4122 version 4 UUID values locally, five at a time, no server round-trip.

Developer Tools · Text/code

Password Generator

Generate strong random passwords with browser cryptography.

Privacy & Random · Random

Regex Tester

Test a regular expression against sample text.

Developer Tools · Text/code

Color Contrast Checker

Check WCAG contrast ratio between two hex colors.

Developer Tools · Text/code

px To rem Converter

Convert px to rem instantly with formula and quick reference.

Converters · Converter

JSON To CSV Converter

Convert an array of JSON objects into CSV.

Developer Tools · Text/code

JSON Minifier

Minify JSON by removing whitespace while preserving valid data.

Developer Tools · Text/code