Developer Tools
23+ powerful, free utilities to boost your productivity.
Showing all 23 tools
EMI Calculator
Calculate your loan EMI easily with detailed breakdown.
GST Calculator
Instant GST calculation for inclusive and exclusive amounts.
Word Counter
Count words, characters, and reading time in real-time.
Image Cropper
Crop and resize images precisely for social media.
Image Compressor
Compress images without losing quality.
Image Resizer
Resize images to any custom width and height in seconds.
QR Code Generator
Generate QR codes for URLs, text, and more.
Password Generator
Generate strong, secure random passwords instantly.
Unit Converter
Convert between length, weight, temperature, and more.
Meta Tag Generator
Generate SEO-friendly meta tags for your website.
PDF Compressor
Compress PDF files to reduce file size while maintaining quality.
PDF Merger
Combine multiple PDF files into a single document.
PDF Splitter
Extract specific pages from a PDF document.
JSON Formatter
Format, validate, and minify JSON with syntax highlighting.
Base64 Encoder
Encode and decode text or files to and from Base64.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly.
URL Encoder
Encode and decode URL components for safe transmission.
Color Converter
Convert colors between HEX, RGB, and HSL formats with live preview.
Case Converter
Convert text to UPPERCASE, lowercase, camelCase, snake_case, and more.
Lorem Ipsum Generator
Generate placeholder text for paragraphs, sentences, or words.
Markdown Previewer
Write and preview Markdown in a live split-screen editor.
Regex Tester
Test and debug regular expressions with live match highlighting.
Diff Checker
Compare two blocks of text and highlight the differences.
30+ Free Online Tools — No Installation, No Sign-up
Zynocode Labs provides a growing collection of high-performance, browser-based utilities spanning finance, writing, developer tools, image processing, PDF management, and more — all completely free and private.
Financial Calculators (India-Focused)
Our EMI Calculator is designed for Indian borrowers — calculate your monthly instalment for home loans, car loans, and personal loans with a full amortization schedule showing interest paid each month. The GST Calculator instantly computes tax-exclusive and tax-inclusive amounts for all Indian GST slabs (5%, 12%, 18%, 28%), and breaks down CGST and SGST separately — essential for freelancers, small businesses, and CA professionals.
Writing & Text Analysis
The Word Counter does far more than count words — it provides real-time character count (with and without spaces), sentence count, paragraph count, unique word analysis, estimated reading time (200 wpm), speaking time (130 wpm), keyword density, and social media character limit tracking for Twitter, LinkedIn, Instagram, and more. The Case Converter transforms text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, PascalCase, and kebab-case instantly. The Lorem Ipsum Generator creates placeholder text by words, sentences, or paragraphs.
Developer & Code Utilities
Format and validate JSON with syntax-highlighted output using our JSON Formatter. Encode and decode Base64 text or files (including data URL generation) with Base64 Encoder. Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly with Hash Generator. Test JavaScript regular expressions live with match highlighting using Regex Tester. Encode and decode URL components safely with URL Encoder. Compare text files line-by-line with character-level diff using Diff Checker. Preview and export GitHub Flavored Markdown with Markdown Previewer.
Image Processing Tools
Reduce image file sizes for faster website load times using Image Compressor — supports JPG, PNG, and WebP with a quality slider and before/after size comparison. Crop images to exact pixel dimensions or social media presets (1:1, 16:9, 4:3) with Image Cropper. Resize images to custom width and height with aspect ratio lock using Image Resizer. All image processing happens locally — your photos never leave your device.
PDF Tools
Reduce PDF file size for email or upload with PDF Compressor. Combine multiple PDFs into a single document with PDF Merger (supports up to 20 files with custom ordering). Extract specific pages or page ranges from any PDF with PDF Splitter. All PDF operations are performed in your browser using pdf-lib — no file is uploaded to any server.
Generators & Converters
Create customized QR Codes for URLs, plain text, email addresses, or phone numbers with adjustable foreground and background colors, downloadable as PNG. Generate cryptographically secure passwords of any length with custom character sets. Convert between units across 8+ categories including length, weight, temperature, area, and Indian-specific units. Convert colors between HEX, RGB, RGBA, HSL, and CSS named colors with Color Converter. Generate complete SEO meta tags including Open Graph and Twitter Card markup instantly.