RawTools Blog
Practical guides for PDF tools, Shopify calculators, IBAN validation, and JSON workflows.
How to remove pages from a PDF (without breaking the rest)
A practical workflow for deleting pages from a PDF safely: how to confirm page numbers, avoid deleting the wrong pages in scanned docs, and when you should extract instead of delete.
JSON Schema validation: how to catch bad API payloads before they break you
A practical workflow for validating JSON payloads with JSON Schema: what it catches, how to read errors, and how to debug common failures.
How to diff two JSON files (and see what actually changed)
JSON diffs get confusing fast. Here’s how to compare two JSON documents reliably, handle key order, and debug array changes without getting lost.
JSONPath in practice: querying JSON without writing code
A hands-on guide to JSONPath: selecting nested fields, filtering arrays, and debugging “why is this empty?” with practical examples.
IBAN vs SWIFT/BIC vs account number: what you actually need for an international transfer
A practical guide to the three banking identifiers people mix up. Learn when you need an IBAN, when you need a SWIFT/BIC, and what “account number” means across countries.
How to parse an IBAN: extracting bank code, branch code, and account number (country-by-country caveats)
A practical guide to breaking an IBAN into components. Learn what’s reliably extractable, what varies by country, and how to avoid common parsing mistakes.
IBAN check digits explained (MOD-97): what it detects, what it can’t, and how to troubleshoot failures
MOD-97 is the checksum behind IBAN validation. Learn how it works, why it catches most typos, and how to diagnose common “invalid IBAN” cases.
How Shopify stores actually calculate profit (with real margins)
A practical way to calculate Shopify profit that holds up once you include fees, shipping, returns, and acquisition cost.
How to create Shopify invoices that look professional (and avoid common mistakes)
A practical guide to generating invoices for Shopify orders: what to include, how to handle taxes, and how to export clean PDFs for wholesale and B2B.
Shopify fees explained: what Shopify actually takes per sale (and why low AOV hurts)
A clear breakdown of Shopify fees: payment processing, transaction fees, fixed fees, and how to compute your effective fee rate by AOV and plan.
LTV/CAC for Shopify: what to model before you scale ads (ratio, payback, cash)
A practical guide to LTV, CAC, and payback period for Shopify stores—how to set targets that survive cash flow and retention reality.
Shopify bundle pricing: how to price multipacks without killing margin
A practical way to price bundles and multipacks on Shopify: discount strategy, blended COGS, shipping effects, and how to avoid bundles that quietly lose money.
Break-even ROAS for Shopify: how to set real ROAS targets (and stop guessing)
A practical guide to break-even ROAS for Shopify: the inputs that matter, how fees and shipping change targets, and how to use ROAS safely when scaling ads.
Returns and refunds on Shopify: how to model the real profit impact (before it surprises you)
A practical guide to quantifying returns and refunds for Shopify: expected-value math, recovery rates, shipping costs, and how to use the numbers to set pricing and policy.
Shopify speed checklist: what to fix before you buy another app
A practical Shopify speed checklist focused on real causes of slow storefronts: theme bloat, app scripts, images, and Core Web Vitals.
How to Compress PDF Files for Email & Uploads (Free & Secure)
File too large to send? Learn how to reduce PDF file size efficiently without losing quality. Perfect for email attachments and portal uploads.
How to Merge PDF Files for Free in 2025 (No Watermarks)
Learn the easiest way to combine multiple PDF files into one document without downloading software or paying for expensive subscriptions.