Image for email — file size, format and Outlook rendering
Updated: May 2026
Recommended file size, formats supported by Outlook and Gmail, maximum width and background images: what to know before embedding images in email.
Apply this directly in the main browser-based tool.
Open the Image Compressor →What this page helps you do
Use this page to prepare an image for the target platform or document type with the right format, dimensions and file size.
- Start from a clean original image.
- Resize only when the destination does not need full resolution.
- Preview the final image before uploading it.
Recommended settings
Use JPEG for maximum compatibility, WebP for modern web publishing, and target size mode when a platform imposes a strict KB or MB limit.
How to do it with Flowfiles
- Check the required dimensions or file-size limit.
- Add the image to Flowfiles.
- Choose the output format.
- Use quality mode or target size mode.
- Download the optimized image and upload it to the platform.
Frequently asked questions
Which format should I use?
JPEG is safest for broad compatibility. WebP is useful for modern web platforms.
Should I resize the image?
Resize it when the destination displays a smaller image than your original file.
Are files uploaded to Flowfiles?
No. Everything is processed locally in your browser.