How to Make a PDF Small Enough to Email

Your PDF is ready, you click send, and the email gets stuck. Attachment limits are the reason. According to Google's help page, personal Gmail accounts can attach up to 25 MB, and above that Gmail replaces the attachment with a Google Drive link. Microsoft's support article says classic Outlook 2013 and later has a default limit of 20 MB for internet email accounts (POP3, IMAP), and Exchange mailboxes default to 10 MB unless an administrator changes it. Work and school accounts often have their own limits.

The receiving side matters too: the recipient's email provider may accept less than yours sends. This guide shows how to get your PDF down to a size that goes through, without making it unreadable.

First: why is the PDF so big?

Almost always it's images. Text and vector graphics take very little space. What makes a PDF heavy is:

• Scanned pages, where each page is a full photo.
• Phone photos turned into a PDF, often several MB per page.
• Embedded pictures in reports, brochures and portfolios.

This matters because PDF compression works on images. A 60-page contract that's all real text is probably already small. A 6-page PDF of phone photos can easily be 30 MB and can shrink a lot.

Method 1: Compress the PDF

1. Open Compress PDF and add the file (or several; you'll get them back in a ZIP).
2. Pick a level:
   • Low: images up to 2400 px on their longest side, at 85% quality. A small reduction, very safe for fine print.
   • Recommended: 1700 px, 70%. A good balance for most documents.
   • Extreme: 1100 px, 50%. The smallest files, but check small text carefully.
3. Or use Compress to X KB and type the size you need. The tool lowers quality step by step until the file is under your target. If it can't get there, it gives you the smallest version it managed and explains why.
4. Download and open the result. Zoom in on the smallest text, signatures and numbers.

Compress PDF only recompresses photos. Text and vector graphics aren't touched, so real text stays sharp and selectable. It also removes embedded thumbnails and XMP metadata. If the result isn't smaller than the original, you get the original back with the message "Your PDF is already optimized". It runs in your browser, so the document doesn't leave your device.

Quick targets: if you just need something under 1 MB, for example for a web form with a small attachment limit, compress to 1 MB opens with that target already set.

Method 2: Send less

Sometimes the best way to shrink a PDF is to remove what the recipient doesn't need:

• Delete pages. Blank pages, duplicate scans, cover sheets and terms-and-conditions pages that nobody asked for. Remove pages shows thumbnails. Tap the pages to remove, or type them ("2, 5-7").
• Split into parts. If everything is needed but it's still too big, Split PDF divides it by page ranges, such as "1-20, 21-40". Send the parts in separate emails with clear subjects ("Part 1 of 2").

Method 3: Fix it at the source

If you're making the PDF yourself, these choices keep it small from the start:

• Scan text pages in black and white or grayscale, not color.
• Don't take a phone photo when you could export directly: "Save as PDF" from Word or your browser creates small, searchable files.
• Crop the empty space around pictures before you put them in a document.

Which method should you use?

A quick way to decide:

• Scanned document or photos, slightly over the limit: compress with Recommended. That's usually enough.
• Scanned document, far over the limit: compress with a KB target, then check readability. If fine print suffers, remove unneeded pages or split the file.
• Digital PDF (exported from Word, a bank or a website) that's too big: it's probably long rather than image-heavy. Split it or send only the pages that matter.
• A presentation or portfolio full of photos: compress with Recommended first. Try Extreme only if the images don't need to show fine detail.

Or skip the attachment

For very large files, such as a long scanned archive or a high-quality portfolio, an attachment may not be the right tool. Google says Gmail automatically turns oversized attachments into a Google Drive link, and Microsoft suggests sharing a link to a file in a shared location. A link avoids the limit entirely, but the recipient needs access to it and you're trusting that storage service with the file. For anything sensitive, a compressed attachment that stays within your email provider is often simpler.

How small is small enough?

It depends on both sides. Use the lowest limit that applies: your provider's (25 MB for personal Gmail, 20 MB by default for Outlook desktop with internet accounts, often 10 MB on Exchange) and anything the recipient told you. Remember that the limit covers the total of all attachments in one email, not each file. If you're sending three PDFs, add up their sizes.

Common mistakes

• Compressing a text-only PDF over and over. If it barely shrinks the first time, it won't shrink further. Split it or remove pages instead.
• Using Extreme for everything. Check that fine print is still readable. If it isn't, use Recommended and split the file.
• Compressing a password-protected file. Most tools need it unlocked first, and you should only do that for documents you have the right to unlock.
• Forgetting the total. Three 9 MB files are 27 MB together.

Checklist

• Know the limit: your provider, the recipient, and the total of all attachments.
• Compress with Recommended, or with a KB target.
• Remove unneeded pages, or split into parts.
• Open the result and check the smallest text before you send.