Developer Tools Online Free
Developer utilities that never leave your browser
Free developer utilities: JSON formatter and validator, Base64 encoder, JWT debugger, UUID generator, and regex tester — all client-side.
16 free tools · 100% browser-based · no sign-up
JSON Formatter
JSON input
Beautify, validate and minify JSON in one click
Open toolBase64
Input
Encode or decode text and files to/from Base64
Open toolJWT Debugger
JWT token
Decode and inspect JWT tokens — header, payload, expiry
Open toolUUID Generator
Options
Generate secure UUID v4 identifiers in bulk
Open toolRegex Tester
Pattern & test text
Test and debug regular expressions with live matches
Open toolHTML Escape
HTML text
Escape <, >, &, quotes for safe HTML insertion
Open toolURL Encoder
URL or text
Percent-encode URLs and query parameters
Open toolCSV → JSON
CSV input
Convert CSV tables into clean JSON arrays
Open toolJSON → CSV
JSON input
Turn API results into spreadsheet-ready CSV
Open toolLorem Ipsum
Generation options
Realistic placeholder text, words or paragraphs
Open toolPassword Generator
Password options
Strong random passwords with strength meter
Open toolQR Code Generator
QR content
Free QR codes for URLs, Wi-Fi, text — instant PNG
Open toolString Hash
Text to hash
MD5, SHA-1, SHA-256, SHA-512 in one click
Open toolHTML → Text
HTML input
Strip tags, keep the content — clean plain text
Open toolMD → HTML
Markdown input
Instant markdown → HTML with live preview
Open toolUser Agent Parser
User agent string
Decode any user agent string into readable details
Open toolWhy use developer tools at Super Utility Hub?
Every developer tools on Super Utility Hub runs 100% in your browser. Nothing is uploaded, nothing is stored, and nothing is installed — the results are generated instantly on your own device. There is no account to create, no file size limit, and no watermark on your output.
All tools are free forever, work on desktop and mobile, and are updated continuously. If a tool isn't listed yet, it's likely on the roadmap — check back soon.
Frequently asked questions
Are the dev tools really free?
Yes. Every dev tool is free with no limits, no trials, and no premium paywall. The site is supported entirely by advertising.
Do I need to create an account?
No account, no email, and no sign-up is required. Open a tool, use it, and you're done — that's it.
Is my data sent to a server?
No. All tools run locally in your browser. Your files and input never leave your device.
Do the tools work on mobile?
Yes. Every tool is responsive and works in any modern browser on Android and iOS.