How to Resize Images for Email Newsletters

Updated August 30, 2026 · 9 min read

Resizing is the single biggest lever for file size. Newsletter images load inside email clients, often on mobile data, so every kilobyte counts toward a fast open.

Recommended settings for email newsletters

SettingStarting point
FormatJPEG (WebP where accepted)
Widthabout 1200 px on the long edge
Quality70
File size150 KB or less

These are practical defaults. If the platform or form you are using publishes its own limits, follow those instead.

How to Resize Images

File size scales roughly with the number of pixels. Shrinking a 4000 by 3000 photo to 1200 pixels wide removes most of the data before compression even begins.

Keep the aspect ratio locked so nothing looks stretched. Our compressor scales proportionally when you set a maximum width, so you only need to enter one number: 1200.

Step by step with TheCompressJPEG

  1. Open the compress JPEG to 150 KB tool, or the main compressor for custom settings.
  2. Drop in your image. Nothing is uploaded; it is processed in your browser.
  3. Set the maximum width to 1200 and the target size to 150 KB.
  4. Press Compress, check the result and download it.
Ready to try it? Compress your JPEG to 150 KB now. It's free and private.

Quick tips

  • Use WebP where it is supported and you control the page.
  • Never re-compress an already compressed JPEG if you can avoid it.
  • Strip metadata from images you share publicly.
  • Always keep the original file and compress a copy.

FAQ

How do I compress many images for e-learning courses at once?

Drop all of them into the tool together and use Download all to get a single ZIP.

What JPEG quality should I use for e-learning courses?

Quality around 78 keeps photos looking natural while cutting file size substantially.

Will compressing reduce image quality for e-learning courses?

Some detail is removed, but at sensible settings the difference is not visible at normal viewing size.

Wrapping up

For email newsletters, the reliable recipe is simple: resize to around 1200 pixels, compress at quality 70 or to a 150 KB target, and check the result before you upload. Keep the original so you can always start again.

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