What is the Outlook attachment limit?

Outlook defaults to 20MB, but Exchange administrators can set it lower — commonly 10MB or 5MB in corporate environments.

My IT department set a 10MB limit. How do I hit it?

Enter 10 as your target in Docpressor. The output will be under 10MB, ready for Outlook.

Does this work for Outlook.com and Office 365?

Yes — the limit applies to both desktop Outlook and Outlook.com / Microsoft 365.

Can I send multiple compressed PDFs in one email?

Yes — compress each file with Docpressor, then attach them all to the same Outlook email.

Compress PDF for Outlook Email

Outlook's default 20MB attachment limit (and lower Exchange server policies) can block large PDFs. Compress your file to send it as a normal attachment.

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Auto-delete after 30 min

Target max file size:

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Drag up to 100 files at once — PDF, JPG, PNG or TIFF

Why Choose Docpressor for Compress PDF for Outlook

Outlook 365 Ready

Works for Outlook.com, desktop Outlook, and Microsoft 365.

Custom Limit

Set any MB target to match your Exchange server policy.

Batch Compress

Compress multiple attachments before emailing in one go.

No Software

Works in Edge and Chrome — no Outlook plugin required.

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

One-click payment — no account needed

Step 4

Download

Get your file instantly, auto-deleted after 30 min

Compress PDF for Outlook — Everything You Need to Know

Microsoft Outlook's default 20MB attachment limit seems generous, but corporate Exchange server policies frequently reduce this to 10MB or even 5MB. When you hit the limit, Outlook simply refuses to send the email.

Docpressor solves this with precision targeting. Ask your IT department what the limit is, enter that value in Docpressor, and compress your PDF to fit. The result is a standard PDF that Outlook handles like any other attachment.

For Outlook power users who regularly send large documents, Docpressor PRO provides unlimited compression at any MB target with no per-file charges.

Frequently Asked Questions

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