How to Reduce PDF Size for Email

First, check how big your PDF actually is

Before fixing anything, find the real number. On Windows, right-click the file and choose Properties. On a Mac, select it and press Command+I (Get Info). On an iPhone, open Files, long-press the PDF and look at the size in the info panel. On Android, open Files or your file manager and check the file details. If the number is under about 15 MB, it will almost certainly send fine anywhere. Between 15 and 25 MB, it depends on the recipient's provider. Above 25 MB, it will not go through as a normal attachment.

Why PDFs get so large

Three things bloat a PDF. Scanned images are the biggest cause: a page scanned as a photo at high resolution can be several megabytes on its own, while a page of plain text is typically only tens of kilobytes (typical ranges — the exact numbers depend on the scan settings). Embedded fonts add weight when a document carries unusual typefaces. Uncompressed photos inside a report or catalogue add up fast. A 90-page scanned report can easily pass 60 MB, while the same text typed as a document might be under 1 MB.

Knowing the cause tells you the fix. If the bulk is scanned images, deleting or splitting pages helps most. If it is one huge photo, rebuilding that page smaller helps most.

Fix 1 — Delete pages you don't need

Reports, statements and application packs often carry pages nobody will read: cover sheets, duplicate pages, blank pages, appendices. Removing them is the fastest size cut of all, and it costs nothing in quality. Open the free Delete PDF Pages tool, select your file, enter the page numbers to remove (for example 1, 7, 12-14), and download the slimmer file. Check the new size before you send it — you may already be under the limit.

Fix 2 — Split the PDF into emailable parts

When every page matters, split the file into parts that each fit under the limit. A 60 MB, 90-page report, for example, splits into three parts of roughly 20 MB each (the exact split depends on how heavy each page is, so check each part's size after splitting). Send them as Part 1, Part 2 and Part 3, and say so in the email so the recipient knows nothing is missing.

1. Open the free Split PDF tool in your browser.
2. Select your PDF file.
3. Enter the page ranges for the first part, for example 1-30.
4. Download the part, then repeat for the remaining ranges.
5. Check each part's size, then attach them to separate emails if needed.

The split runs entirely in your browser, so a private report never has to be uploaded anywhere to be cut down to size.

Fix 3 — Rebuild image-heavy PDFs from smaller images

If your PDF is mostly photos — a scanned contract, a photo catalogue — the pages themselves are the problem. Rebuild the document from smaller images: export or re-save the photos at a sensible size, then combine them into a fresh PDF with the JPG to PDF tool. A photo saved at a reasonable resolution for screen reading is far smaller than the same photo at print resolution, and on screen nobody can tell the difference.

Fix 4 — When splitting isn't enough

Sometimes even the split parts are too big, or the recipient needs one single file. In that case, sending a link is the honest answer: upload the PDF to a cloud drive you already trust (Google Drive, OneDrive, iCloud) and email the link instead of the file. This is also what Gmail does automatically when an attachment is too large — it replaces the file with a Drive link. A link is not a failure; for very large files it is the correct tool.

Email attachment limits compared

Limits below are the providers' published figures, checked October 2026. Remember the encoding catch: email attachments are encoded as text before sending, which adds roughly a third to the file's size — so a 25 MB limit leaves room for only about 18 MB of raw attachments.

Service	Attachment limit	If you go over
Gmail (personal)	25 MB total per message	Attachment becomes a Google Drive link
Outlook.com	25 MB total per message	OneDrive link offered instead
Yahoo Mail	25 MB total per message	Send a cloud link
iCloud Mail	20 MB per message	Mail Drop: up to 5 GB as a link, available 30 days

Safe rule of thumb: keep attachments under about 15 MB when you know the recipient's provider, and under 10 MB when you don't.

Key takeaways

• Check the file's real size first — under 15 MB is safe almost everywhere.
• Delete unneeded pages, then split what remains into parts under the limit.
• Remember the encoding overhead: a 25 MB limit means roughly 18 MB of actual files.
• For very large files, a trusted cloud link beats a bounced email.