About DevKit4You

A free, private, browser-based developer tools suite. 22 tools, zero tracking, built for professionals.

// mission

DevKit4You was built around one principle: tools should just work. No sign-ups. No tracking. No servers seeing your data. No premium tiers blocking basic features.

Every single operation — from decoding Base64 to generating SHA-512 hashes — runs entirely in your browser using native JavaScript APIs. When you close the tab, your data is gone. That's a guarantee, not a policy.

We believe developer tools should be fast, focused, and free. DevKit4You is all three.

// all 22 tools

Complete Tool Directory

🔓

Base64 Decode Convert Base64 encoded strings back to plain text. Supports per-line decoding and multiple charsets.

🔐

Base64 Encode Encode plain text to Base64 with URL-safe format, MIME chunking, and per-line encoding support.

#️⃣

Hash Generator Compute MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously using the Web Crypto API.

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JSON Formatter Validate, pretty-print with syntax highlighting, minify, and sort JSON keys. Error reporting with line numbers.

🔑

JWT Decoder Decode and inspect JSON Web Token headers, payloads, and claims. Shows expiry status with remaining time.

🌐

URL Encoder / Decoder Percent-encode or decode URL components using encodeURIComponent or encodeURI, with auto-convert mode.

🎲

UUID Generator Generate cryptographically random UUID v4s in bulk (up to 1000) with multiple output formats.

🔲

QR Code Generator Create QR codes from text or URLs with adjustable error correction. Download as PNG. No third-party APIs.

🔀

Text Diff Compare two text blocks line-by-line using LCS diffing. Additions in green, deletions in red.

🎨

Color Converter Convert between HEX, RGB, and HSL with a live preview swatch and one-click copy for every format.

📁

File Encode / Decode Upload any binary file to encode to Base64, or decode Base64 back to the original file. Up to 100MB.

🖼️

Image → Base64 Convert images to Base64 data URIs, CSS backgrounds, or raw Base64 for embedding in code.

📦

Number Base Converter Convert between Binary, Octal, Decimal, and Hex with custom bases from 2 to 36.

🔐

Password Generator Create strong passwords with custom length, charset controls, and entropy insights.

🔗

URL Parser & Builder Break down URLs into components, edit query params, and rebuild clean links instantly.

📊

JSON ↔ CSV Convert JSON arrays to CSV and CSV back to JSON with table preview and delimiter controls.

📝

Regex Tester Test regex patterns in real time with highlighting, groups, flags, and replace mode.

🕐

Timestamp Converter Convert Unix timestamps to readable dates and back across UTC, local, and ISO formats.

📄

Markdown Previewer Write markdown and preview rendered output live with support for tables, code blocks, and GFM.

⏱️

Cron Expression Builder Build and validate cron schedules visually for recurring jobs and automation workflows.

🎨

CSS Gradient Builder Design linear and radial gradients with visual controls and copy-ready CSS output.

🔢

Number Formatter Format numbers for locale, currency, percentages, and scientific notation in one place.

// who built this

Sandeep Krishna Devanaboina built DevKit4You as an independent developer focused on practical, privacy-first tooling for everyday engineering workflows.

The project is shaped by real-world development needs: fast debugging, reliable formatting and conversion utilities, and a strict no-tracking approach where all processing stays in the browser.

// privacy

✓ What we DO

Process everything in your browser
Load Google Fonts (cached after first visit)
Use QR library from Cloudflare CDN
Serve static files only

✗ What we DON'T

Collect or store your data
Run analytics or tracking scripts
Set cookies of any kind
Send data to any server

// tech stack

HTML5 CSS3 Custom Properties Vanilla JavaScript (ES2022) Web Crypto API FileReader API Clipboard API crypto.randomUUID() QRCode.js (CDN) Fira Code (Google Fonts) Familjen Grotesk (Google Fonts) Zero frameworks Zero build steps