Compress photos so the email actually sends
The attachment limit that matters is not always the one on your side. Compressing before you attach is the only part of it you control.
Keeps the resolution and finds the best balance, so the picture looks the same and the file is smaller.
Drag and drop your images
or click to choose · Ctrl+V to paste (up to 30)
Metadata such as the GPS location is removed from every image you get back.(Images already under the target size are not re-compressed, but the metadata is still stripped — the picture itself is untouched.)
Whose limit stops the message
Outlook personal accounts cap attachments at 20MB, and Microsoft 365 organisations can be configured up to 150MB by an administrator. That upper number is misleading in practice: the recipient's mail server frequently enforces a smaller one, and it is their limit that decides whether the message arrives.
For anything going outside your own organisation, keeping the whole message under about 10MB is the safe target. Three phone photos will exceed that on their own.
Compress deliberately rather than letting the client do it
Outlook offers to shrink large images when it sends them, but it decides the size for you and applies it to every picture in the message. Setting your own ceiling first — mode "Target size", then a value such as 2000 for 2MB — keeps the choice with you, and you can see the result before it goes anywhere.
If the photos are for printing or archiving on the other end, send them at a deliberate size rather than the smallest one that fits: a 2MB photo survives being printed, a 200KB one does not.
What happens to your photos
Every image stays on your device. The compression runs in your browser through WebAssembly, so nothing is sent to a server, nothing is stored, and there is no queue to wait in. Closing the tab is all the cleanup there is.
Frequently asked questions
The recipient never got it, but my client said it sent. Why?
Almost always a size limit on a server between you and them, and the bounce message does not always make it back. Since you cannot see the recipient's limit, the practical rule is to keep the whole message under about 10MB when it leaves your organisation.
How small should a photo be for email?
It depends what happens to it next. For viewing on a screen, 300KB to 1MB per photo is plenty and keeps a multi-photo message comfortably small. For anything that will be printed, do not go below about 2MB, and keep the pixel dimensions high — printing is where over-compression becomes visible.
Can I compress several photos in one go?
Yes. Drop up to 30 in, set one target size, and download them individually or as a single ZIP.
Does this work with iPhone photos?
Yes. HEIC and HEIF are decoded in the browser, so you can drop an iPhone photo straight in and get a JPEG that any mail client will display.