ToolmetryAI Blog

Practical Guides for Real Workflows

In-depth articles on invoicing, security, development, and SEO. Every guide links to free tools you can use immediately.

Business12 min read

GST Invoice Format India — HSN Guide

Step-by-step guide to GST-compliant invoices in India. Mandatory fields, HSN codes, CGST/SGST/IGST splits.

Jun 12, 2026Read article
Security10 min read

Password Strength Guide 2026

Practical password strength guide for 2026. Entropy, GPU crack times, NIST recommendations, passphrases vs passwords.

Jun 10, 2026Read article
Utility8 min read

QR Code Error Correction Guide

Complete guide to QR code error correction. Covers L/M/Q/H levels, Reed-Solomon encoding, and print vs screen use.

Jun 8, 2026Read article
Development11 min read

JWT Security Best Practices (2026)

JWT security guide. Algorithm selection (HS256 vs RS256), token expiration, refresh tokens, vulnerabilities.

Jun 6, 2026Read article
Discord13 min read

Discord Webhooks Guide

Discord webhook guide. Creation, payload structure, embeds, rate limits, error handling, security.

Jun 4, 2026Read article
Development9 min read

JSON vs JSON5 vs JSONC Guide

Comparison of JSON, JSON5, and JSONC formats. Covers syntax differences, trailing commas, comments, use cases, and which parsers support each format.

Jun 2, 2026Read article
Utility10 min read

Image Compression for Web Guide

Web image compression guide. JPEG, PNG, WebP, AVIF formats, lossless vs lossy, Core Web Vitals impact.

May 30, 2026Read article
SEO14 min read

Meta Tags Complete Guide for SEO in 2026

Complete SEO meta tags guide. Title tags, descriptions, Open Graph, Twitter Cards, canonical, structured data.

May 28, 2026Read article

Explore 120+ free tools

Every article links to free, browser-based tools. No signup, no install, no data leaves your device.

Browse all tools