Toolbag – lightning-fast utilities for developers

Simple, effective developer tools that work instantly with no unnecessary features.

Format, validate and beautify your JSON data instantly

Calculate string length, character count, and byte size

Encode and decode URLs with special characters

Convert text to and from Base64 encoding

Decode and inspect JSON Web Tokens with expiration verification

Generate placeholder text for designs and mockups

Generate secure SHA-256 hash from text or files

Convert between Unix timestamps and human-readable dates

Generate random UUID v4 strings for your applications

Create beautiful diagrams and flowcharts with Mermaid syntax

Why use toolbag.dev?

All tools run directly in your browser - your data never leaves your device.

Get instant results without waiting for server processing or page reloads.

Tools built with a clear purpose - do one thing and do it well.