maerz.studio

18 Free Developer Tools

All tools run in your browser. Zero data sent. Zero tracking. Zero backend.

Client-side·Open source·Zero tracking

⌘K

18 tools · 18 total · 100% client-side

Dev Utils

Crypto hashing · Base64 · UUID v7 · RegExp · JSONC

JavaScript#crypto#base64#uuid

PDF Tools

Merge, split and compress PDF files client-side.

Data#pdf-lib#pdfjs

Image Toolkit

Resize, convert, compress images via Canvas API & WebCodecs.

Data#canvas#webcodecs

File Converter

CSV ↔ JSON ↔ YAML ↔ XML with Monaco editor preview.

Data#papaparse#monaco

Color Palette

Extract palettes from images. CSS Color Module 5 HSL/OKLCH.

CSS#color-thief#oklch

Markdown Exporter

Write Markdown, export to PDF or HTML with syntax highlighting.

Data#marked#html2pdf

QR Generator

QR codes with logo overlay. Installable as PWA.

DevOps#qrcode#pwa

URL Shortener

Shorten links via Cloudflare Workers KV. Analytics dashboard.

DevOps#cloudflare#workers

CSS → Tailwind Converter

Paste any CSS and get the equivalent Tailwind classes instantly

CSS#tailwind#css#converter

JWT Decoder

Decode and inspect any JWT token — header, payload, signature

Security#jwt#token#auth

Meta Tag Generator

Generate perfect Open Graph, Twitter Card, and SEO meta tags with live preview

SEO#meta#og#seo

Cron Expression Builder

Build and understand cron expressions visually — never guess again

DevOps#cron#schedule#linux

JSON Diff

Compare two JSON objects and highlight every difference

Data#json#diff#compare

CSS Gradient Generator

Build linear, radial, and conic gradients visually with live CSS output

CSS#gradient#css#background

Box Shadow Generator

Design perfect box shadows visually — multiple layers, live preview

CSS#box-shadow#css#shadow

SVG Optimizer

Paste SVG markup and get a minified, optimized version instantly

CSS#svg#optimize#minify

.env Validator

Paste your .env file and validate format, find duplicates and missing values

DevOps#env#environment#variables

Timestamp Converter

Convert Unix timestamps to human-readable dates and back — every timezone

JavaScript#timestamp#unix#date

Changelog

+10 Built-in Tools

2026

Added 10 new built-in tools: JWT Decoder, Tailwind Converter, Meta Tag Generator, Cron Builder, JSON Diff, CSS Gradient Generator, Box Shadow Generator, SVG Optimizer, .env Validator, and Timestamp Converter. All run 100% client-side.

Redesign & Features

11.04.2026

Complete redesign of all 8 apps. Switched to Royale Purple dark theme, added Geist font family, improved layout, header, footer, sidebar shortcuts, legal requirements, and this changelog.