By Sergio Alonzo Piña·July 28, 2026·6 min read

13 Developer Tools That Respect Your Privacy

Why traditional dev utilities quietly read your code, and how a suite of 13 tools running entirely in the browser removes the problem.

Every developer has been here. You have a giant JSON object you can't read, a regex that won't match, or a JWT you need decoded right now. You search "json formatter", click the first result, and paste.

What you just did was send your company's database structure — possibly secrets, possibly customer PII — to an unknown remote server run by people you know nothing about. It takes two seconds and it happens thousands of times a day.

The problem with classic web utilities

The tools we all use — diff checkers, regex testers, SQL formatters — traditionally work by uploading your input to a backend, processing it with a Python or Node script, and returning the result. During that moment your code sat in their RAM. It may have landed in their access logs. It may have been retained in a database for "analytics", or used to train a model. None of that requires malice; a stack trace that captures the request body is enough.

We built the alternative: 13 of the most-used engineering utilities, all running 100% in your browser via WebAssembly and modern JavaScript.

The 13 tools

Text Diff Checker

Compare two texts side by side.

Try Text Diff Checker →

Regex Tester

Test regular expressions live.

Try Regex Tester →

Color Converter

Convert between HEX, RGB, HSL and OKLCH.

Try Color Converter →

SQL Formatter

Format SQL queries.

Try SQL Formatter →

HTML Formatter

Indent and prettify HTML.

Try HTML Formatter →

JWT Decoder

Decode JSON Web Tokens.

Try JWT Decoder →

Markdown Previewer

Markdown editor with live preview.

Try Markdown Previewer →

XML Formatter

Format and validate XML.

Try XML Formatter →

YAML Formatter

Format YAML.

Try YAML Formatter →

Word Counter

Count words, characters and paragraphs.

Try Word Counter →

Password Generator & Analyzer

Generate secure passwords and measure their strength.

Try Password Generator & Analyzer →

Email Extractor

Extract email addresses from any text.

Try Email Extractor →

Minify Code

Minify HTML, CSS and JavaScript.

Try Minify Code →

Why local-first is the right default

When you use these tools, the JavaScript and WebAssembly downloads to your cache once. From then on execution is immediate: no network latency, no queue, no upload progress bar. There is no file size limit either — the minifier handles 50 MB files without complaint, which a server-backed tool would reject outright.

But the real argument is simpler. Operating with no server means Docuboxer physically cannotsee, track or store your source code. You satisfy GDPR, HIPAA and your company's strictest security policy by default, because the data never moves. And unlike a privacy policy, you can verify it in ten seconds: turn off your network and keep working.

Frequently asked questions

What does "Zero-Server" actually mean here?

That the tool's logic ships to your browser as JavaScript and WebAssembly and executes there. There is no backend endpoint receiving your input, so there is nothing to log, store or leak — not as a policy, but as an architectural fact.

Is there a file size limit?

Only your machine's available memory. Without an upload there's no request body cap and no gateway timeout — the minifier has been tested with 50 MB files without trouble.

Does this help with GDPR or HIPAA compliance?

It removes a category of problem: if data never leaves the user's device, there is no third-party processor to document, no transfer to justify and no data-processing agreement to negotiate for that step.

How can I verify nothing is uploaded?

Load the page, disconnect from the network, and use the tool. It keeps working. You can also watch the browser's network tab while you process a file — no request is made.

Try the full suite

Bookmark Docuboxer and stop handing your data to unknown servers.

Go to all tools →