What is the HMRC Self Assessment upload limit?

HMRC GOV.UK portals typically enforce a 3.5-4MB upload limit for supporting documents with Self Assessment tax returns.

What documents need compressing for Self Assessment?

P60s, P45s, dividend statements, bank interest certificates, expense receipts, and any scanned supporting documents.

Will HMRC accept a compressed PDF?

Yes — compressed PDFs are standard documents. HMRC does not distinguish between compressed and uncompressed files.

My accountant asked for PDFs under 3.5MB — why?

Your accountant is preparing documents for HMRC submission. The 3.5MB limit is the standard GOV.UK requirement.

Compress PDF for HMRC Self Assessment

HMRC's GOV.UK portal enforces a 3.5MB upload limit for Self Assessment documents. Docpressor compresses your tax PDFs to fit perfectly.

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Why Choose Docpressor for Compress PDF for HMRC Self Assessment

3.5MB HMRC Preset

One-click preset matching the GOV.UK 3.5MB limit.

Tax Document Ready

P60s, P45s, receipts, and statements all supported.

Accountant Friendly

Accountants use this to prepare client documents for HMRC.

Self Assessment Season

Batch compress dozens of client documents at once.

How It Works

Step 1

Upload

Drag & drop your PDF, JPG, PNG or TIFF file

Step 2

Set MB Limit

Enter the target file size for your portal

Step 3

Pay Securely

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Step 4

Download

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Compress PDF for HMRC Self Assessment — Everything You Need to Know

UK Self Assessment tax returns require uploading supporting documents to HMRC's GOV.UK portal. P60s from employers, P45s, bank interest statements, dividend certificates, and scanned expense receipts all need to fit within the 3.5MB upload limit.

Docpressor's 3.5MB preset is one of the most-used settings on the platform — specifically designed for HMRC and GOV.UK submissions. One click selects the right target and the compression runs in seconds.

Accountants preparing Self Assessment documents for multiple clients use Docpressor PRO's batch processing to compress entire client document sets simultaneously — cutting hours off the annual tax filing workload.

Frequently Asked Questions

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