Companies House upload-a-document filing document upload

Official requirement

Requirement verified August 21, 2026 · Source: Companies House ↗

Documents this application needs

Completed filing document (PDF under 4 MB)

PDF · ≤3999 KB

Choose file or pagesSeveral pages are fine; we combine them into one PDF in order

0/1 files ready

Sources disagree on this

compatible PDF definition
The Registrar's (Upload Service) Rules 2020 define a compatible file as A4-rendered PDF up to 4 MB; the guidance phrases it as "less than 4MB".
How we handle it: Target the stricter reading: a single PDF strictly under 4 MB so both phrasings are satisfied.