Use Case
Compress PDF for Outlook
Free online tool — no signup, no software, instant results.
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Sending a PDF via Outlook requires staying within its attachment limit of 20 MB. Outlook enforces a 20 MB total attachment limit across all attached files. Our free PDF compressor reduces file size while keeping your document readable and professional.
How to Use – Step by Step
1
Upload your PDF
Select the PDF you intend to share via Outlook.
2
Compress to target size
Apply medium or high compression to get below 20 MB.
3
Share via Outlook
Download the compressed file and attach it to your message.
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Pro Tips
- Outlook enforces a 20 MB total attachment limit across all attached files.
- Check the file size shown after compression before downloading.
- If sharing via mobile, compress on the same device to avoid re-uploading.
Frequently Asked Questions
What is the Outlook attachment size limit?
Outlook supports attachments up to 20 MB.
Will compression affect how the PDF looks when received?
Minor compression has no visible effect on standard documents.
Can I send a compressed PDF via Outlook on mobile?
Yes. Compress in your mobile browser, then share directly through the app.
Does compression affect digital signatures in the PDF?
Yes — if your PDF is signed, sign it after compressing.
What if the file is still too large?
Try splitting the PDF and sending pages in multiple messages, or upload to cloud storage and share a link.