Dev Mini Tools | Fast, Local-First Developer Utilities

No signups · Local-first

Free Online Developer Tools — No Signup Required

A focused toolbox for formatting, testing, and tidying code. Everything runs in your browser—secure, instant, and distraction-free.

Launch JSON Formatter Try Regex Tester

0 Uploads

Data stays on device

5 Tools

Core dev workflows

Fast

CDN + no bloat

Toolkit

Dev Mini Tools

Updated

JSON Formatter

CSS Minifier

HTML Beautifier

Base64 Encoder

Regex Tester

Promise

Everything runs locally. Your snippets never leave the browser.

Tools by Category

SEO Tools

Meta Tag Generator

Create essential SEO meta tags.

robots.txt Generator

Control crawler access.

Sitemap XML Generator

Build sitemap.xml from paths.

Open Graph Generator

OG + Twitter card tags.

Image & UI Helpers

Image to Base64

Convert images to data URLs.

Base64 to Image

Preview and download images.

CSS Gradient Generator

Design linear/radial gradients.

Box Shadow Generator

Fine-tune modern shadows.

Color Converter

HEX ⇄ RGB ⇄ HSL.

Code & Format

JSON Formatter / Minifier

Beautify and compact JSON quickly.

HTML Beautifier

Make HTML readable with proper indent.

HTML Minifier

Strip comments and collapse whitespace.

CSS Formatter

Indent and clean CSS for readability.

CSS Minifier

Compress CSS for production.

JS Beautifier

Prettify JS/TS using Prettier.

JS Minifier

Minify JavaScript with Terser.

Encode / Decode

Base64 Encoder / Decoder

Convert strings to/from Base64.

URL Encoder / Decoder

Safely encode/decode URLs and params.

HTML Encode / Decode

Escape or unescape HTML entities.

Developer Utilities

Regex Tester

Test regex with live highlights.

Regex Cheat Sheet

Quick reference for common tokens.

Case Converter

Upper, lower, snake, kebab cases.

Lorem Ipsum Generator

Generate placeholder paragraphs.

Text Diff Checker

Compare two texts and highlight changes.

UUID Generator

Create multiple v4 UUIDs instantly.

JWT Decoder

Decode JWT header and payload locally.

Timestamp Converter

Convert Unix seconds/millis and ISO.

Color Converter

Convert HEX, RGB, and HSL with preview.

API & Data

JSON to CSV Converter

Export JSON arrays as CSV.

CSV to JSON Converter

Parse CSV to JSON arrays.

XML to JSON Converter

Convert XML to JSON.

Security & Productivity

Password Generator

Generate strong passwords.

Hash Generator

MD5, SHA-1, SHA-256 hashes.

Minify All

Minify HTML, CSS, JS together.

Code Snippet Manager

Save and organize snippets.

Bonus Tools

API Request Tester

Test REST APIs with custom headers.

HTTP Status Checker

Reference for HTTP status codes.

Markdown to HTML

Convert Markdown to HTML.

HTML to Markdown

Convert HTML to Markdown.

SQL Formatter

Format SQL with indentation.

Cron Job Generator

Generate cron expressions.

Why Dev Mini Tools?

Dev Mini Tools keeps your workflow lean: JSON Formatter, CSS Minifier, HTML Beautifier, Base64 Encoder, and Regex Tester. Everything runs client-side so your API payloads, code snippets, or secret tokens never leave your browser.

We prioritize clarity and speed with a tight, distraction-free interface. Keep us pinned for day-to-day tasks and skip the heavy extensions or signups.