100% Free & Accurate Tools Verified by Satyajit Giri, M.Tech in Computational Engineering 256-bit Secure Client-Side Calculations

Developer & Webmaster Tools

Essential web developer utilities including JSON formatter, Base64 encoder, regex tester, and hash generators.

22 Available & Upcoming Tools
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JSON Formatter & Validator

Format, beautify, and validate JSON code with tree view.

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Base64 Encoder / Decoder

Encode strings and images to Base64 or decode Base64 back.

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URL Encoder & Decoder

Encode URL query parameters & decode percent-encoded URLs.

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HTML Entity Converter

Escape HTML tags & decode special character entities.

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CSS Minifier & Beautifier

Compress CSS stylesheets for faster web speed or format code.

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JavaScript Minifier & Formatter

Minify JavaScript scripts for production or beautify code.

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Cryptographic Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 checksums.

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UUID / GUID Generator

Generate cryptographically random UUID v4 identifiers in bulk.

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Regex Tester & Debugger

Test regular expressions with live real-time match highlighting.

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IPv4 Subnet & CIDR Calculator

Calculate network ID, broadcast, mask & usable host range.

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Unix Timestamp Converter

Convert Epoch timestamp seconds to human readable GMT/local date.

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Color Code Converter

Convert HEX, RGB, RGBA, HSL, HSV & CMYK color models.

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JWT Token Debugger

Decode JSON Web Tokens, inspect claims, and verify exp/iat timestamps.

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SQL Formatter & Beautifier

Beautify, indent, and format SQL queries for MySQL, Postgres & Oracle.

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Markdown to HTML Converter

Convert Markdown to clean HTML and HTML to MD with live visual preview.

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Crontab Schedule Generator

Build Linux cron jobs visually with human explanation and next run times.

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Meta Tag & Open Graph Generator

Create SEO meta tags, Open Graph, and Twitter Cards with live mockup.

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.htaccess 301 Redirect Maker

Generate 301 redirects, force HTTPS, non-www, and GZIP rules.

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Random Password Generator

Generate cryptographically secure passwords & Diceware passphrases.

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JSON & CSV Converter

Convert JSON arrays to CSV spreadsheets or CSV to JSON format.

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Google Advanced Search & Dork Builder

Construct advanced Google search queries to extract exact data, free PDFs & hidden files.

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Custom QR Code & Wi-Fi Barcode Generator

Generate custom color QR codes for URLs, Wi-Fi passwords, WhatsApp & vCards with PNG/SVG download.

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About Developer & Webmaster Tools on CalculatorSmart

All tools within our Developer & Webmaster Tools collection are built to run client-side with zero data storage. Whether converting formats, optimizing documents, or crunching numbers, you receive immediate, private, and mathematically verified results.