DevToolBox

Free online developer tools — no sign-up, no installs. Just open and use.

Formatters

JSON Formatter

Format, minify, and validate JSON with syntax highlighting.

Regex Tester

Test regular expressions against text with real-time match highlighting.

Encoders / Decoders

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to plain text.

URL Encoder / Decoder

Encode or decode URLs and query string parameters.

Converters

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

About DevToolBox

DevToolBox is a collection of free online utilities for software developers. All tools run entirely in your browser — your data never leaves your device.

Currently featuring 5 tools including JSON formatting, Base64 encoding, URL encoding, regular expression testing, and Unix timestamp conversion. More tools are added regularly.