Split a PDF for Email Attachments
If a PDF is too large to email, splitting creates smaller parts that fit attachment limits and send reliably.
Step 1: Pick the limit that matches your email
Choose Gmail 25 MB or Outlook 20 MB presets. If you are unsure, use a slightly lower custom size.
Lower targets improve delivery when multiple attachments are included.
Step 2: Split with PDFThin
Use Split by size to create attachment-ready parts. The tool preserves page order and names parts clearly. Each part stays under the limit so you can attach them without errors.Step 3: Review the output
Open a part to confirm it displays correctly. You can preview several parts to ensure page flow.
If parts feel too large, lower the size target and split again.
Step 4: Send with context
Include a short message that explains the PDF is split and lists the number of parts.
This helps recipients keep everything in order and avoids confusion.
FAQ
Will recipients need special software?
No. Each part is a standard PDF and can be opened with any PDF reader.
Can I merge the parts later?
Yes. You can merge parts after downloading or use any PDF merge tool.
Do parts stay under the limit?
Parts are generated to stay under your selected limit, with a safety margin.
Sending tips
Attach in a single email if possible
If your provider allows, attach all parts in one email to keep the conversation simple.
If not, send multiple emails and label the subject with part numbers.
Keep filenames short
Short filenames reduce clutter for recipients and make it easier to follow the sequence.
Use a consistent naming format like Report-Part-01.pdf.