Free
JSON formatter & validator
Validate, format, minify and recursively sort JSON entirely in your browser.
Developers, analysts, testers and technical teams
Developer tools
Format, encode, decode, test and inspect common development data without sending it away. Fast client-side helpers for everyday development work. Sensitive text stays on the device, although you should still avoid pasting production secrets into any unnecessary tool.
9free tools in this category.
Choose a tool
Clear inputs. Useful outputs.
Every result stays on your device unless a page explicitly says otherwise.
Free
Base64 encoder & decoder
Encode Unicode text to Base64 or decode Base64 and Base64URL safely.
Free
URL encoder & decoder
Encode or decode URL components and inspect malformed percent escapes clearly.
Free
JWT decoder
Decode JWT header and payload claims locally and inspect common time fields.
Free
Regex tester
Test a JavaScript regular expression, flags and replacement against sample text.
Free
Hash generator
Create SHA-256, SHA-384 or SHA-512 digests from text using Web Crypto.
Free
UUID v4 generator
Generate one or many cryptographically random UUID version 4 identifiers.
Free
Unix timestamp converter
Convert explicit seconds, milliseconds or microseconds to local, UTC and ISO dates.
Free
Slug generator
Turn a heading into a clean URL slug with separator and transliteration options.
What this category helps with.
Start with the real question
Format, encode, decode, test and inspect common development data without sending it away.
See the method
Inputs, formula or processing method, examples and important limitations are explained on every tool page.
Use the answer with context
Fast client-side helpers for everyday development work. Sensitive text stays on the device, although you should still avoid pasting production secrets into any unnecessary tool. Tools give an estimate or transformation; you remain in control of the final decision.
Need a deeper workflow?
Move from a quick answer to a reusable business result.
The Premium suite adds 20 advanced forecasting, audit, data and document tools. Guests can try 1 run; a verified free account gets 3 per rolling 24 hours.