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You've attached your PDF and Gmail flags it. Or Outlook refuses to send. Or the recipient's email server bounces it back. Email attachment limits are a daily headache — here's how to solve them in under two minutes. ## Quick Size Guide by Email Platform | Platform | Limit | Target Size | |---|---|---| | Gmail | 25MB | Under 20MB to be safe | | Outlook | 20MB | Under 15MB | | Yahoo Mail | 25MB | Under 20MB | | Corporate/work email | Often 10MB | Under 8MB | | Very strict servers | 5MB | Under 4MB | ## How to Make a PDF Smaller for Email 1. Go to [pdfhub24.com/compress-pdf](/compress-pdf) 2. Upload your PDF 3. **For under 25MB:** Medium compression 4. **For under 10MB:** High compression 5. **For under 5MB:** High compression + consider splitting 6. Download and attach ## When Compression Isn't Enough Some PDFs — particularly colour brochures, photo books, or large architectural drawings — resist compression because the content is inherently large. In these cases: **Option 1 — Use a file sharing link.** Upload to Google Drive, Dropbox, or OneDrive and paste a sharing link in your email instead of an attachment. This is often the more professional approach for large documents anyway. **Option 2 — Split and send in parts.** Use [pdfhub24.com/split-pdf](/split-pdf) to break into sections. Send each as a separate email or include all as separate attachments if within the limit. **Option 3 — Convert to greyscale first.** If your PDF has colour images that aren't essential to be in colour, convert to greyscale using [pdfhub24.com/grayscale-pdf](/grayscale-pdf), then compress. Removing colour information dramatically reduces file size. ## The Fastest Fix for Most Situations For 90% of email compression problems: upload to compress-pdf, choose medium compression, download. The whole thing takes 30 seconds. Try that first before anything else.