PDF Too Large for Email? How to Fix It Fast
Gmail, Outlook and most email services block attachments larger than about 20–25 MB. If your PDF is too big to send, you do not need to delete anything — just compress it. KOIAE's Compress PDF tool shrinks your file so it slips under the limit.
How to make a PDF small enough to email
- Open the Compress PDF tool. Go to the KOIAE Compress PDF page.
- Upload the oversized PDF. Drag and drop the file that is too big to email.
- Compress it. KOIAE reduces the size while keeping the document readable.
- Download and attach. Download the smaller PDF and attach it to your email.
Tips for the best results
- If it is still too large, split the PDF and send it in parts.
- Scanned documents shrink the most when compressed.
- For very large files, share a link instead of attaching.
Why use KOIAE Compress PDF?
KOIAE Compress PDF is completely free — there is no account to create, no watermark on your files and no daily limits for everyday use. Most processing happens right in your browser, so your documents stay private, and it works on any device from Windows and Mac to Android and iPhone.
Frequently asked questions
What is the email attachment size limit?
Gmail and Outlook cap attachments at around 20–25 MB.
Will compressing ruin the document?
No, KOIAE keeps text sharp and only optimises what is safe.
What if it is still too big?
Split the PDF into smaller files and send them separately.
Related tools: Split PDF · Merge PDF · PDF to JPG · All PDF tools