Companies House document upload
Official requirementRequirement verified August 21, 2026 · Source: GOV.UK — Upload a document to Companies House guidance ↗
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Documents this application needs
Companies House document (PDF)
PDF · ≤4000 KB0/1 files ready
Sources disagree on this
Strict less-than ceiling
The guidance says the PDF “must be less than 4MB”, excluding a file of exactly 4 MB.
How we handle it: UploadPrep stores the ceiling one byte below 4 MB so no prepared file can fail the strict check.
One document at a time
The service accepts one document per submission, though an RP07 may carry up to nine evidence files within it.
How we handle it: Prepare each Companies House document separately; combine RP07 evidence into its single allowed file.