Welcome to CodingSetu — a fast, private developer toolbox

Developers reach for the same little utilities every day — format some JSON, decode a Base64 string, generate a UUID, diff two files, convert a CSV. Most online tools that do this are slow, ad-heavy, and — worst of all — upload whatever you paste to a server.

CodingSetu is our answer: a big, fast toolbox where everything runs in your browser.

What makes it different

Nothing is uploaded. Every tool computes locally. You can open your browser’s Network tab and watch: no request carries your data. Our Content-Security-Policy even makes exfiltration impossible — connect-src only allows our own origin and analytics.
Fast and flat. No sign-up, no paywalls, minimal JavaScript. Heavy libraries load only on the page that needs them.
Wide coverage. Calculators, converters, formatters, generators, cryptography, a full Data & Transform suite (JSON/YAML/XML/TOML + code generation), a huge CSV toolkit, encoding/decoding, validators, repair tools, diff & compare, and more.
Learn as you go. Our guides explain the concepts behind the tools — UUID versions, Base64 vs encryption, the CSV format and its pitfalls.

Privacy is the point

A lot of “free” tools are free because your data is the product. CodingSetu takes the opposite stance: because the tools are pure client-side code, there’s simply nowhere for your data to go. Paste a production API response, a customer CSV, or a secret token — it never leaves your machine.

What’s next

We’re continuously adding tools and guides. Have a request? Get in touch. Meanwhile, browse everything from the Tools menu, or start with the JSON Formatter, Base64 Encoder or UUID Generator.

Happy building. — The SetuLab team