Free OnlineDeveloper Tools

Format JSON, encode Base64, decode JWT, convert YAML, and more — right in your browser.

56 tools · no signup · your data stays on your device

JSON

13

YAML

1

Base64

7

URL

2

JWT

2

Time

4

UUID

10

Hash

7

CSV

5

Text

5

Developer tools that just work

ToolDeck is a free collection of online utilities built for developers who need fast, reliable tools without friction. Format and validate JSON, encode or decode Base64, inspect JWT tokens, convert between JSON and YAML, encode URLs, and convert Unix timestamps — all without signing up, installing anything, or leaving your browser. Every tool runs entirely client-side, so your data stays on your device.