Compress PDF for Email
When a PDF is too large to email, the message bounces or the file is sent as a cloud link instead of an attachment. PDFHive shrinks it to under 10 MB, which fits Gmail, Outlook and most work email systems.
Your files are processed in your browser and never leave your device.
How to use Compress PDF for Email
- Select the PDF you want to attach. The target is set to 10 MB, a size almost every email service accepts.
- Click "Compress PDF" and check the new size.
- Download the smaller PDF and attach it to your email as usual.
- If it's still over 10 MB, see the options further down this page, such as splitting the PDF into parts.
Why your PDF is too large to email
Gmail allows attachments up to 25 MB and Outlook.com up to 20 MB, but many work and school email systems stop at 10 MB. On top of that, email encodes attachments in a way that makes them about a third bigger on the way, so a 20 MB PDF can push a message over the limit.
Aiming for 10 MB keeps you safely under all of these. For most documents, PDFHive reaches it with light compression that is hard to notice.
What if your PDF is still too big to email?
Some PDFs, such as long scans or photo-heavy reports, stay above 10 MB even after compressing. You still have options.
- Choose Strong for a smaller file whose text is still clearly readable.
- For scanned paperwork, Black and white makes the file much smaller.
- Split the document into two or three parts with Split PDF and send them in separate emails.
- For very large files, share a link from your cloud storage instead of attaching the PDF.
Frequently asked questions
What is the attachment limit for Gmail and Outlook?
Gmail accepts attachments up to 25 MB per email and Outlook.com up to 20 MB. Many company and school systems set a lower limit, often 10 MB. The limit is for the whole email, so several attachments add up.
Why aim for 10 MB if Gmail allows 25 MB?
Because the person receiving it may use a stricter system, and attachments grow by about a third when sent. 10 MB arrives safely almost everywhere.
Can I send several PDFs in one email?
Yes, as long as they add up to less than the limit. Compress each one here, or combine them first with Merge PDF and compress the single file.
Will the person I send it to see any difference?
Usually not. At a 10 MB target most PDFs only need light compression, and text, links and the layout stay exactly the same.
Can I compress a PDF on my phone before emailing it?
Yes. Compress it in your phone's browser, then attach the downloaded file from your Downloads or the Files app.
Helpful guides
- Are online PDF tools safe? Upload sites vs in-browser tools
What happens to your file on upload sites and in-browser tools, and how to check where it really goes.
- Bank statement PDF won't print, merge or compress? Permissions explained
Why statements open fine but refuse to print or merge, what PDF permissions are, and what to do about them.
- How to reduce PDF size for job, university and visa portals
Combine, trim and compress your documents in the right order so they fit the portal's upload limits.
- How to send a PDF securely by email
A short routine for emailing sensitive PDFs, from removing pages to adding a password and sharing it safely.
- How to turn phone photos of documents into one clean PDF
Photograph documents so they look scanned, then crop, combine and shrink them into one tidy PDF.
- Online form file limits: KB, MB, pixels and cm explained
What "under 50 KB", "200 × 230 pixels" and "3.5 × 4.5 cm" really mean, and how to meet each one.
- Why is my PDF so large, and how do I make it smaller?
What really takes up space in a PDF, and the quickest way to shrink each kind of file.
Related tools
Compress PDF
FreeMake a PDF file smaller.
Fit strict 100 KB upload limits.
Scanned IDs and form uploads.
Multi-page scans and statements.
Gentle compression, under 1 MB.
Merge PDF
FreeCombine several PDFs into one file.
Split PDF
FreeSplit a PDF or extract pages.