Developer tools

Small everyday tools for developers — JSON, timestamps, Base64 and UUIDs — that run entirely in your browser.

Free · No sign-up · No login · No install · No watermark

Tools in this category

JSON FormatterFormat, validate and minify JSON Unix Timestamp ConverterEpoch time to date and back Base64 Encode / DecodeText and files to Base64 and back UUID GeneratorRandom v4 and time-ordered v7 UUIDs Markdown PreviewLive preview, copy HTML

Guides

Markdown cheat sheetMarkdown is a way to write formatted text with plain characters. This cheat sheet covers the syntax you will use most, and you can try each line in the Markdown Preview.

Developer tools

Pasting API responses, tokens or config files into an online tool can leak secrets. These tools run only in your browser: the text you paste is never uploaded, logged or stored.

Each tool shows exactly what it does, with the rules it follows (for example UTF-8 for Base64 and RFC 9562 for UUID v4 and v7).