Code and IDE tooling covers the small, constant chores of writing software: formatting a snippet, comparing two versions of a file, testing a pattern before it reaches production, and shrinking an asset before it ships. None of these need a plugin or a build pipeline.

The browser utilities below are the half of that workflow that works best without an editor. They are useful precisely when you do not want to open one — reviewing a snippet in a pull request, checking a regular expression, or comparing a config file somebody just pasted into chat.

🧰 Free DevToolBox Tools

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

Diff Checker & Text Diff — Compare two files, snippets, logs or config dumps side by side.
Regex Tester Online — The full regex workbench, with a pattern explainer, cheat sheet and common examples.
JSON Formatter — Beautify, validate and tree-view JSON documents.
SQL Formatter Online — Reformat SQL in 15+ dialects before it goes into your code.
HTML Minifier — Minify or pretty-print HTML while protecting pre, script and style content.
Markdown Preview — Render Markdown to check how a README or doc page will look.
UUID Generator — Generate v1, v4 and v7 identifiers for fixtures and test data.
Base64 Encoder/Decoder — Decode encoded values in config files and source snippets.
Base64 Decoder — Decode Base64 back to readable text or binary.

❓ Frequently Asked Questions

Should I format code in the browser or in my editor?

For a single snippet, or a file you received, the browser is quicker — no plugins and no configuration. For anything inside your own repository, use the editor's formatter so the project's shared style rules win.

Why use a regex tester when my language already supports regex?

Because every engine differs. A tester shows you exactly which groups matched and where, which is far faster than adding print statements only to discover your pattern was greedy.

Does minifying HTML break anything?

It can, if you strip whitespace that carries meaning. DevToolBox's HTML minifier leaves pre, textarea, script and style content intact and collapses only the whitespace between tags.

Can I compare two large files in the browser?

Yes. The diff tools process the text locally, so file size is limited by your machine's memory rather than by an upload limit.