Guides & how-tos
Step-by-step guides for PDFs, images and e-invoices — with free tools that run in your browser.
E-invoicing in Germany: who must do what, and when
Who must receive and issue e-invoices in Germany, and when? All deadlines, transition rules, exemptions and valid formats in plain English.
Read moreXRechnung or ZUGFeRD — what’s the difference?
XRechnung or ZUGFeRD? Structure, use cases, readability and profiles compared — and which German e-invoice format your customers need.
Read moreHow to create an e-invoice
Create a German e-invoice without expensive software: options, mandatory details and a step-by-step guide for XRechnung and ZUGFeRD.
Read moreE-invoicing in Germany: what foreign suppliers need to know
Selling to German customers from abroad? What the e-invoicing mandate means for foreign suppliers, which formats to use and how to invoice authorities.
Read moreE-invoicing mandates in the EU: Germany, France and Belgium compared
E-invoicing deadlines in Germany, France and Belgium at a glance: who must receive and issue e-invoices, from when, in which formats — as of October 2026.
Read moreWhat is Peppol? The e-invoicing network explained
Peppol explained: the four-corner model, access points, Peppol IDs and the Peppol BIS Billing 3.0 format — and when you need Peppol for e-invoicing.
Read moreFactur-X and ZUGFeRD explained
What Factur-X and ZUGFeRD are, how the PDF/A-3 + XML hybrid works, which profiles count as full e-invoices and how France and Germany use them.
Read moreHow to make a PDF smaller
Why PDFs get large and how to shrink them: compression, smaller images, fewer pages and better scan settings — with step-by-step tips.
Read moreHow to merge PDFs on any device
Combine several PDFs into one file on Windows, Mac, iPhone and Android — with tips on page order, file size and picking single pages.
Read moreHow to edit a PDF — the essentials
Edit PDFs without expensive software: change text, add text and images, fill in forms, sign and redact — an overview with the right tools.
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