Every email service has a maximum attachment size. Exceeding it means your email bounces back or the attachment is silently stripped. Here are the current limits:

Important: Remember that email encoding adds ~33% overhead to attachments (Base64 encoding). A 20MB file becomes ~27MB in the email. So practically, aim for files 25% smaller than the stated limit.

For corporate email, many organizations set limits at 5MB or 10MB. Government agencies often cap even lower at 2-5MB.

The fastest way to reduce PDF size for email:

Step 1: Go to fileswift.in/tools/compress-pdf

Step 2: Upload your PDF (drag & drop or click to browse)

Step 3: Set compression level based on your target:

• Need under 5MB? Use Max Compression (30-40%)
• Need under 10MB? Use Balanced Compression (50-60%)
• Need under 25MB? Use Light Compression (70-80%)

Step 4: Download the compressed file and attach it to your email

The entire process takes less than 30 seconds. No signup, no login, no file limits.

Sometimes even maximum compression is not enough — especially for PDFs with many high-res images or hundreds of pages. Here are fallback strategies:

Strategy 1: Split + Compress Use the FileSwift Split PDF tool to break the document into smaller parts. Send them as separate attachments or combine only the essential pages.

Strategy 2: Compress Images Before Creating the PDF If you are building the PDF from images (scans, photos), compress the images first using the FileSwift Image Compressor, then convert them to PDF.

Strategy 3: Use a Cloud Link Instead Upload the PDF to Google Drive, Dropbox, or OneDrive, and share the link in your email. This bypasses attachment limits entirely.

Strategy 4: Reduce Image Resolution If you have access to the source document (Word, PowerPoint), reduce image resolution to 150 DPI before exporting to PDF.

Different situations call for different approaches:

Job Application PDFs Many HR portals limit uploads to 2-5MB. Use Max Compression. Resumes are mostly text, so they compress extremely well without visible quality loss.

Contract and Legal Documents These need to remain readable. Use Balanced Compression (50-65%). Text stays sharp, and most logos/signatures remain clear.

Photo-Heavy Reports Annual reports, portfolios, and presentations with many images are the hardest to compress. Start with Balanced Compression; if still too big, use Max Compression and verify images are still acceptable.

Scanned Documents Scanned PDFs are essentially full-page images and can be very large. Max Compression works well here because the text is already rasterized — you are compressing images either way.