DevToolbox — Developer Tools That Just Work

Popular Tools

JSON Formatter & Validator Format, validate, and minify JSON with instant error reporting. Regex Tester Test regular expressions against sample text with live match highlighting. JWT Decoder Decode JSON Web Tokens and inspect the header and payload. Hash Generator Generate SHA-256, SHA-384, and SHA-512 hashes from text. Markdown Previewer Write Markdown and see the rendered HTML output live. Base64 Encoder Encode text into Base64 format. Color Converter Convert colors between HEX, RGB, and HSL formats. Unix Timestamp Converter Convert between Unix timestamps and human-readable dates. UUID Generator Generate random UUID v4 identifiers. Password Generator Generate strong, random passwords with custom rules. QR Code Generator Generate QR codes for URLs, text, email, phone, and Wi-Fi.

Explore Our Tools

Every tool is organized into one of four categories, so you can browse by the kind of task you're working on.

Developer Tools

Formatters, validators, decoders, and reference lookups for everyday development work — JSON, regex, hashes, JWTs, HTML/CSS/JS, and more.

Text Tools

Count words, compare text, convert case, and preview Markdown — practical utilities for writers, editors, and developers alike.

Converters

Convert between data formats and number systems — Base64, URL encoding, color formats, timestamps, JSON/CSV/XML/YAML, and binary/decimal/hex.

Generators

Generate UUIDs, passwords, random strings, QR codes, placeholder text, and boilerplate CSS or HTML snippets.

Why DevToolbox?

Fast

No sign-up, no waiting on a server round-trip — most tools run instantly in your browser.

Free

Every tool on DevToolbox is free to use, with no usage limits or paywalled features.

No account required

Use any tool immediately — there's nothing to sign up for and nothing to log into.

Privacy-focused

Wherever technically possible, your input is processed locally in your browser and never uploaded.

Browser-based processing

Tools like JSON formatting, hashing, and encoding run entirely client-side using standard browser APIs.

Mobile friendly

Every tool and page is designed to work cleanly on a phone or tablet, not just on desktop.

Helpful Developer Resources

View all resources →

What Is JSON? A Practical Introduction JSON (JavaScript Object Notation) is a lightweight, text-based format for representing structured data, built on nested objects and arrays. JSON vs. XML: What's the Difference? JSON and XML both represent structured data, but differ significantly in syntax, verbosity, and typical use cases. What Is Base64 Encoding? Base64 encoding converts binary or text data into a text-safe format using 64 printable characters — it is encoding, not encryption. What Is a UUID? A UUID is a 128-bit identifier designed to be unique across systems without requiring a central coordinating authority. Hashing vs. Encryption: What's the Difference? Hashing is a one-way transformation used for verification; encryption is reversible and used to keep data confidential. What Is a JWT (JSON Web Token)? A JWT is a compact, encoded string used to pass verifiable claims between two parties, commonly for authentication.

Frequently Asked Questions

Is DevToolbox really free to use?

Yes. Every tool is free with no usage limits, no paywalled features, and no account required.

Do I need to create an account?

No. All tools work immediately without signing up or logging in.

Is my data uploaded to a server?

Wherever technically possible, tools process your input entirely in your browser using standard JavaScript and Web APIs, so nothing is sent to a server. Each tool page states its data handling explicitly.

Can I suggest a new tool?

Yes — reach out through the contact page with your suggestion.

Does DevToolbox work on mobile devices?

Yes, every page and tool is designed to work cleanly on phones and tablets, not just desktop browsers.

Developer Tools That Just Work.