DevToolBox groups its tools by the job you are doing rather than by language or framework. Six categories cover the working day: code and IDE chores, API and network debugging, database and SQL work, frontend and design assets, DevOps and CI, and security inspection.

Every tool on this site runs entirely in your browser. Nothing you paste is uploaded, there is no account and there is no usage limit. If you would rather browse everything at once, the full tool list is below.

🧰 Free DevToolBox Tools

Client-side and free — nothing you paste leaves your browser:

JSON Formatter — Format, validate and tree-view JSON.
SQL Formatter Online — Beautify SQL in 15+ dialects.
Base64 Encoder — Encode text and files to Base64.
Base64 Decoder — Decode Base64 back to text.
Regex Tester Online — Test regular expressions with live highlighting, match groups and a built-in cheat sheet.
JWT Debugger — Decode and verify JWT tokens.
Diff Checker & Text Diff — Compare two texts side by side.
Hash Generator — MD5, SHA-1/256/512, CRC32 and HMAC.
CIDR / Subnet Calculator — IPv4 and IPv6 subnet calculations.
Timestamp Converter — Unix timestamps to readable dates.
UUID Generator — Generate UUID v1, v4 and v7.
URL Encoder/Decoder — Percent-encode and decode URLs.
HTML Entity Encoder — Escape HTML special characters.
Color Picker & Converter — Pick colors and convert HEX, RGB, HSL and HSV.
Image Compressor — Shrink PNG, JPEG and WebP in-browser.
HTML Minifier — Minify or pretty-print HTML.
Markdown Preview — Render Markdown as you type.
QR Code Tools — Generate and decode QR codes.

❓ Frequently Asked Questions

How many tools does DevToolBox have?

Around eighty, grouped into seven categories. Every tool is a standalone page that loads on its own, so a slow connection never blocks the one you actually need.

Do I have to install anything?

No. There is nothing to install and nothing to configure. Open a page, paste your input, and the result is computed in the browser.

Why is the site called DevToolBox?

Because it is a box of small tools rather than one large platform. The point is to have the twenty-odd utilities you reach for once a week available instantly, offline-capable and without a login.