Guides
Start with Belgian business files and identifiers, then dive into practical PDF, data and developer topics.
- CODA vs CAMT: Belgian bank files explainedUnderstand the difference between Belgian CODA bank statements and ISO 20022 CAMT files, when accountants use each, and how to inspect or compare them privately.
- Peppol and UBL e-invoices in BelgiumA practical Belgian guide to UBL invoice XML, Peppol participant IDs, validation and what to check before trusting an electronic invoice.
- Belgian company number, VAT number and establishment unitUnderstand the Belgian enterprise number, VAT number and establishment-unit number, how they relate, and which identifier to use for a lookup.
- What is this Belgian administration file?Identify common Belgian accounting, banking, e-invoicing and tax files such as CODA, CAMT, UBL/Peppol, XBRL and Intervat XML.
- Which PDF tool do I need?A quick decision guide for common PDF jobs: combining files, taking pages out, reordering, shrinking for email, converting to images and adding or removing passwords.
- Image formats, dimensions and quality - explainedWhy some images are huge and others blurry: formats, pixel dimensions, DPI, quality settings and cropping, with practical sizes for web, email and print.
- What "processed in your browser" really meansHow in-browser tools work, what local processing protects against, what it does not, and how to check for yourself that a tool does not upload your files.
- How to test PDF compression qualityA practical method to compare PDF compression levels: what to check (text, images, links, forms, print), and how to pick the smallest file that still works.
- Cron, time zones and daylight saving timeWhy cron jobs run at unexpected times: server time zones, daylight saving gaps and repeats, UTC in the cloud, and practical rules to schedule reliably.
- chmod: the same bits mean different things on files and directoriesWhy 644 suits files and 755 suits directories, what execute means on a folder, how to fix permissions recursively without making everything executable.
- Decoding a JWT is not verifying itAnyone can decode a JSON Web Token. Learn what signature verification proves, which claims to check, and common JWT mistakes that lead to security holes.