Pick the exact tool,finish in minutes.
Koumyro curates sharp, privacy-first utilities for developers and creators. Many run locally; if a tool needs a server, we label it upfront.
Hand-picked utilities that show off the range and speed of the collection.
QR Code
Create QR codes from URLs instantly.
JSON Formatter
Validate, prettify, or minify JSON instantly in your browser. No uploads, no server calls—just safe, client-side formatting for faster debugging.
Unix Time Converter
Convert between Unix timestamps and human-readable dates in seconds or milliseconds, entirely in your browser.
JWT Decode
Paste a JSON Web Token to instantly decode the header and payload in your browser. No signature verification, no uploads.
Lorem Ipsum Generator
Generate placeholder text with customizable paragraph and sentence length, entirely in your browser.
Diff Checker
Compare two blocks of text side by side and highlight differences instantly.
Roulette
Spin a roulette wheel from your custom list, entirely in your browser.
Scan the menu by task, then jump straight into the right utility.