Compress images for email
Make photos small enough to attach to an email and still look great on any screen.
Drop images or folders hereAdd your images
JPG, PNG, WebP, AVIF, HEIC and GIF, up to 100 MB each
How it works
Compress in three steps
- 1
Drop the photos you want to send.
- 2
Graviton resizes them to 1600 pixels and compresses them as JPGs.
- 3
Download them one by one or as a ZIP to attach: 3 a day on Free, unlimited on Pro.
Why email needs smaller images
Gmail and Outlook limit attachments to 20–25 MB per message, and a handful of phone photos already passes that. At 1600 pixels a photo is typically 200–400 KB, so dozens fit in one email.
Sending a lot of photos
Attach one ZIP instead of many files: it keeps the original file names, and the recipient gets every photo at once. A ZIP holds up to 3 images on Free and 250 on Pro.
Frequently asked questions
Will recipients see a difference?
On phones and laptops, no. If they will print large or edit the photos, send them at full size with a higher quality instead.
Are my images uploaded?
No. Graviton converts and compresses inside your browser, so your images never leave your device. Nothing is sent while you compress. When you download, the browser sends only a one-way fingerprint of the image, so the download can be counted and approved. Graviton stores none of it.
Can I process many images at once?
Yes. Drop up to 250 images at once and they are compressed together. Download them one by one or as a ZIP that keeps the original file names: 3 a day on Free, unlimited on Pro. On Free, each image counts once a day.
Is it free?
Yes. Compressing and converting are free and unlimited, with no account needed. Downloading needs a free account, which includes 3 downloads a day with every format and setting. Pro removes the daily limit.