How to Send PDF Files Anywhere: Email Limits, Sharing and Fixes

Email attachment limits you can rely on

Before you send a PDF, check its size against the limit of the service the recipient uses. These are the verified attachment limits for the major free email services:

The limit applies to the whole message, not just the PDF, so a file close to the limit can still bounce once message overhead is added. Aim to stay a few megabytes below the limit, not exactly on it. If you do not know which service the recipient uses, plan for the smallest limit in the table: 20MB.

Step 1: Compress first, but know what compression does

Compression is the fastest fix, and it works best on image-heavy PDFs. The PaperKit Compress PDF tool recompresses embedded JPEG images in your browser. That can shrink a scanned or photo-heavy file a lot. It does not recompress text, so a text-only PDF will barely shrink. If compression does not get you under the limit, do not keep compressing the same file and hoping — move to splitting.

Step 2: Split the PDF into parts that fit

If the file is still too big, split it into parts, each under the email limit, and send the parts in order. PaperKit Split PDF splits by page ranges only — there is no split-by-size mode — so estimate pages per part from the total size divided by the page count, split, then check the size of each part and adjust the ranges if a part is still too big. Label each part clearly, for example Part 1 of 3, so the recipient can follow the order and merge the parts back together if needed.

Step 3: Link sharing as the honest fallback

When neither compression nor splitting is practical — for example a single scanned file that must stay in one piece — sharing a download link is the honest fallback. Upload the file to a storage service you already trust, share the link with the right person, and send a short email explaining what the link contains. Link sharing is not a PaperKit feature; it is simply the practical option when email cannot carry the file. Never share a link to a private document publicly, and check the sharing permissions before you send it.

Sharing and sending guides in this series

These five guides cover the whole topic, from diagnosis to a finished application pack:

• How to Reduce PDF Size for Email — the email limits in detail and four fixes for oversized attachments.
• The Best Way to Send a Large PDF When Email Says File Too Big — the compress, split, then share ladder in order.
• Why Is My PDF So Big? 5 Causes and the Fix for Each — find out what is making your file large before you try to shrink it.
• How to Split a PDF by File Size So Each Part Fits an Email — the page-range method with a worked example.
• How to Prepare a PDF Application Pack: Order, Numbers and Watermark — merge, number and watermark a finished pack before sending.

Before you press send

Run this quick check: confirm the file size is under the recipient limit, open the PDF once to confirm the pages are in the right order, and confirm the file name is clear, for example with your name and the document type. If the PDF is password-protected, remember that no PaperKit tool bypasses a password — unlock the file in the application that created it first, or send the password separately through a different channel if the recipient needs it.