Compress PDF for Outlook

Outlook and Hotmail restrict attachments to 20MB. Compress your PDF here before attaching it to your email.

🔒 Files never leave your device⚡ Instant processing in browser💸 100% free — no signup

📄

Drop your PDF here to fix upload errors

or click to select file — PDF only

Target size (optional)

targeting 20 MB

⚡ Outlook File Size Limits (Quick Fix)

•Outlook.com and Hotmail cap email attachments at 20MB.
•Microsoft 365 (work/school) accounts may have a higher limit of up to 25MB, set by the organisation's admin.
•Outlook desktop (the app) can send larger files via OneDrive links, bypassing the 20MB attachment limit.

👉 Fix: Compress your file below 20 MB using the tool above.

About this tool

Outlook.com and Hotmail enforce a 20MB attachment limit. Microsoft 365 accounts may allow up to 25MB depending on admin settings.

How to use this tool

Select or drag and drop your file into the tool above.
Adjust the settings or target size as needed for your specific requirement.
Wait a moment while your file is processed directly in your browser.
Download the final file safely to your device.

💡 Good to know

→Outlook.com and Hotmail cap email attachments at 20MB.Microsoft Support ↗
→Microsoft 365 (work/school) accounts may have a higher limit of up to 25MB, set by the organisation's admin.Microsoft Docs ↗
→Outlook desktop (the app) can send larger files via OneDrive links, bypassing the 20MB attachment limit.Microsoft Support ↗
→Files blocked by Outlook include .exe, .bat, .vbs, and other executable types regardless of size.Microsoft Support ↗

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❓ Frequently Asked Questions

What is Outlook's attachment size limit?+

Outlook.com and Hotmail allow up to 20MB. Microsoft 365 work accounts may allow up to 25MB depending on admin configuration.Source: Microsoft Support ↗

How do I send a PDF larger than 20MB in Outlook?+

Upload the file to OneDrive and share the link. Outlook will offer to do this automatically when you attach a large file.Source: Microsoft Support ↗

Does compressing to 19MB guarantee Outlook delivery?+

Yes for Outlook.com. For Microsoft 365 accounts, the limit depends on your organisation's settings.Source: Microsoft Support ↗

Is there a difference between Outlook.com and Outlook desktop limits?+

Yes. Outlook.com (web) enforces 20MB. Outlook desktop can attach larger files by converting them to OneDrive links automatically.Source: Microsoft Support ↗

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