Reduce photo size for email
The cap is the whole message, not each photo. Resize toward 1920 px, then compress to JPEG so Gmail, Outlook, and a work inbox will actually send it. Files are deleted within 1 hour.
Compose · 28 MB
IMG_2048.heic25 MB cap
The 25 MB cap is the message
Gmail adds every attachment together. Six iPhone photos at 5 MB each is already over. Gmail attachments on a personal account sit at 25 MB. Past that, Gmail often yanks the files and leaves a Drive link. The other person gets a link, not a photo in the thread. An HR portal and a lot of Outlook builds then refuse the link.
Outlook.com is around 20 MB. Transit encoding still fattens the bytes, so a folder that looked like it would fit sometimes does not. Count the sum.
Work and school inboxes are tighter
The bounce you care about is often the receiving server. A clinic, a university, or a government mailbox can sit well under 25 MB. Workspace admins set their own cap. Gmail let you hit Send. Their server sent it back. You only see that if you read the bounce.
If they asked for a real attachment, a Drive link is the wrong fix. Shrink the photos. A 50 KB visa field is a different job: 50 KB photo.
Resize first, then compress
A 48 MP hallway photo is thousands of pixels across. Nobody looks at that in an email pane. Drop the long side toward 1920 px in Resize image, then run Compress image. A quality slider on a 4000 px JPEG still leaves a fat file. Pixels first.
If they named 200 KB or 500 KB, use Compress to 200 KB or Compress to 500 KB. Do not convert to WebP to save more. The other person's software is why you are here.
- Open Resize image. Set the long side around 1920 px. Keep the ratio.
- Run that JPEG through Compress image. Up to 10 files, 20 MB each.
- Attach those files. Delete when you have the download.
HEIC and WebP in the attachment
iPhone photos are often HEIC. Gmail on a Mac may preview them. Outlook on Windows frequently shows a generic icon. Convert to JPEG first: HEIC to JPG. The Live Photo clip stays behind. If you send this album every week, iPhone JPEG.
Chrome Save as can hand you a WebP even when the URL said .jpg. Same refusal. Convert that file: Chrome WebP.
iPhone Mail already offers Small, Medium, Large
Apple Mail can downsize on send. That copy lives in that message. The roll stays huge. Android Gmail often has no such picker, which is why a batch from a Pixel blows the cap with no warning.
A screenshot PNG from a 4K monitor is a different fat file. If it is a photo of a house, JPEG. If it is sharp UI text you must keep, run Compress PNG or resize first. WhatsApp crushing a chat send is WhatsApp original.
Questions
Does Gmail compress photos I attach?
No. The recipient gets the bytes you attached. Gmail only steps in when the message is over the cap, and then it often becomes a Drive link.
How many iPhone photos fit in 25 MB?
A few originals. After a 1920 px resize and a normal JPEG compress, dozens. Count the whole message, not each file.
Why did work email bounce when Gmail sent it?
Their server has its own cap, often lower. Shrink until the bounce stops, or ask what number their IT actually set.
Should I convert to WebP to make the email smaller?
No. WebP is what Chrome already saved, and that is the file Word and a lot of inboxes refuse. Send JPEG.
Outlook shows a blank icon for my iPhone photo.
That is usually HEIC, not a size problem. Convert with HEIC to JPG, then shrink if the message is still over the cap.
Do you keep the file?
Original and result are deleted within 1 hour. You can delete them from the download screen.