How-to guides

How to merge PDF files — free guide

Step-by-step guide to combine PDFs in your browser without upload.

How to compress PDF — reduce file size

Compress PDF files locally to fit email limits — browser guide.

How to format JSON online

Pretty-print and validate JSON locally in your browser.

How to create XRechnung — DE guide

Create and validate XRechnung invoices for German public buyers.

Job application PDF — tips (DE)

Merge, compress and sign application PDFs locally before sending.