PureDevTools

Utility & Math Tools

Unit converter, aspect ratio calculator, DPI calculator, number base converter, roman numerals, IP address tools, text cleaner, email extractor, and more.

15 tools — All free, no sign-up, runs entirely in your browser.

Unit Converter

Convert length, weight, temperature, volume, area, speed, data, and time units.

Aspect Ratio Calculator

Calculate aspect ratios for images, video, and screens with common presets.

DPI/PPI Calculator

Calculate DPI/PPI from pixel dimensions and physical size. Print size calculator.

Number Base Converter

Convert between binary, octal, decimal, hex, and custom bases.

Roman Numeral Converter

Convert between decimal numbers and Roman numerals (1-3999).

IPv4/IPv6 Converter

Convert and analyze IPv4/IPv6 addresses with subnet calculator.

Text Cleaner

Remove extra whitespace, smart quotes, zero-width chars, and HTML tags from text.

Email Extractor

Extract email addresses from text with deduplication and domain filtering.

WiFi QR Code Generator

Generate QR codes for WiFi networks. Scan to connect — no typing needed.

TOTP Generator

Generate and validate TOTP codes with Web Crypto API. RFC 6238 compliant.

Barcode Generator

Generate Code 128 barcodes from text. SVG and PNG download.

Phone Number Extractor

Extract phone numbers from text with international format support.

MAC Address Generator

Generate random MAC addresses with vendor OUI and format options.

Epoch Date Converter

Convert epoch timestamps to dates and back. Multiple timezone support.

QR Code Reader

Scan and decode QR codes from uploaded images.

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