What is Gmail’s attachment limit?

Gmail’s attachment cap is 25 MB. Larger files become a Google Drive link (support.google.com/mail/answer/6584). Gmail measures that 25 MB limit before encoding (Gmail sending limits in Google Workspace), so a 20 MB file sends from Gmail. Receiving servers such as Outlook.com (25 MB per email) count the encoded message, which is about 33–37% larger, so ~18 MB parts are safer for any recipient. We do not invent ISP-specific caps.

My portal says 200 KB. Is that Gmail?

No. 200 KB is a form upload, not mail. Use the 200 KB target on the compressor (200,000 bytes). Splitting into 18 MB parts will not help a 200 KB field.

Does compress replace split by size?

No. Compress rewrites images. Split copies pages into new files. A 40-page scan that must stay readable is often split into 2 MB parts. A 4-page photo PDF for a job portal is a 200 KB or 500 KB compress.

Compress a PDF for Email or Portal Limits

Two different caps get searched as “compress pdf for email.” One is Gmail (and similar webmail). The other is a government or exam portal that wants 100 KB, 200 KB, 500 KB, or 2 MB. FlashKit Tools has both a PDF compressor and a Split PDF size mode. Using the wrong one wastes a readable scan.

The 200 KB button is walked in compress to 200 KB. Size-split packing is in split a PDF by file size.

Match the cap

Portals: Target Size in KB. Gmail: 25 MB before encoding; split into ~18 MB parts if the other party is not on Gmail.

Open PDF Compressor

Gmail vs a 200 KB box

Gmail’s attachment cap is still 25 MB. Files over that become a Drive link — see Gmail attachment size. Workspace documents that 25 MB is checked before encoding (sending limits), so a 20 MB PDF can leave Gmail. Outlook.com and many company servers count the encoded message (about a third larger), so parts around 18 MB are the heads-up size already used on Split PDF. FlashKit Tools does not publish made-up Airtel, Jio, or “office Wi-Fi” limits.

A portal “200 KB PDF” is the whole upload. Compress. Do not split into 18 MB pieces.

Decision fork

Every page, photo-heavy, cap in KB or 1–2 MB — Target Size on the compressor. 1 KB = 1,000 bytes.
Every page, already JPEG-tight, cap in MB — split by file size. Compress will not invent a smaller JBIG2.
Only some pages — split by range. Smaller because pages left.
You still have the JPGs — rebuild with JPG to PDF under a size mode instead of recompressing a fat export.

Step-by-step for a portal

Read the form. Write down 200 KB vs 500 KB vs 2 MB.
Drop the unlocked PDF on PDF compressor. Pick that preset. Tick grayscale only for mono scans.
If the amber note says closest-achievable is still over the cap, split off annexes or lower DPI in Quality mode and accept the softness.
If you compressed parts separately, Merge PDF only if the portal wants one file again — merging uncompressed parts undoes the work.

Digital signatures usually die on any rewrite. Compress a copy. Encrypted files are rejected here on purpose.

Match the cap

Gmail vs a 200 KB box

Decision fork

Step-by-step for a portal

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