MUTools

Free Development tools

About Development tools

Free tools for everyday engineering work — JSON formatting, a regex tester, cron expressions, a Markdown editor, text diff, Base64, URL encoding, JWT decoding, UNIX timestamps, CSV⇄JSON, and CSS gradients. All run in your browser with no signup.

Tools tagged Development

CSS Gradient Generator

Free CSS gradient generator for linear, radial, and conic gradients. Adjust colors, angle, and alpha, then copy as CSS, Tailwind, or SCSS. Runs in your browser.

  • Generator
  • Development
  • Design & Color

Text Diff Checker

Compare two texts and highlight line, word, or character-level differences. Ignore whitespace and case; copy as a unified diff. Runs entirely in your browser.

  • Checker
  • Development

JSON Formatter & Validator

Format, beautify, and validate JSON with your chosen indent (2/4/tab), spotting syntax errors instantly. Free and ad-free. Runs entirely in your browser.

  • Edit & Format
  • Checker
  • Development

Regex Tester

Test JavaScript regex with live match highlighting, capture groups, replace preview, flag toggles, presets, and shareable URLs. Runs entirely in your browser.

  • Checker
  • Development

Cron Builder & Parser

Build and parse cron expressions, see their meaning and next run times in any time zone. Free crontab generator, no signup, runs in your browser.

  • Generator
  • Development

Markdown Editor

Free online Markdown editor with live preview. Write Markdown, see it rendered in real time, and convert Markdown to HTML to copy or download. Supports tables, task lists, and code highlighting. Runs entirely in your browser — no login.

  • Edit & Format
  • Development

Base64 Encode / Decode

Encode text to Base64 and decode it back, with URL-safe Base64, 76-char MIME line wrapping, and real-time results. Runs entirely in your browser.

  • Encode / Decode
  • Development

Image ⇄ Base64 Converter

Convert images to Base64 (data URL) and back, with ready-to-paste CSS, HTML, and Markdown snippets generated automatically. Runs entirely in your browser.

  • Converter
  • Encode / Decode
  • Development

URL Encode / Decode

Percent-encode text for URLs and decode it back, with query-component and full-URL scopes so links never break. Runs entirely in your browser.

  • Encode / Decode
  • Development

JWT Decoder

Decode a JWT into header, payload, and signature, with iat/exp/nbf shown as readable times and HS256/384/512 verification. Runs entirely in your browser.

  • Encode / Decode
  • Security
  • Development

UNIX Timestamp Converter

Convert UNIX timestamps (epoch) to dates and back, detecting 10- and 13-digit values, toggling UTC/local, and showing ISO 8601. Runs entirely in your browser.

  • Converter
  • Development
  • Date & Time

CSV to JSON Converter

Convert CSV to JSON and JSON to CSV, with header detection, type inference, JSONL, and Excel-compatible output. Runs entirely in your browser.

  • Converter
  • Development

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