File size for images

File size for images and photos is a very rough way to determine the quality an image.  In the above image you can see the HB50 cupcakes image is a .jpg file and is 2MB in size. The JoggingShoes image is also a .jpg file and is 71KB in size. A KiloByte or KB is smaller, much smaller, than a MegaByte or MB. So the JoggingShoes image is smaller than the HB50 cupcakes one.



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If you're a beginner you can use file size to help understand the suitability of an image for its purpose. As a rough guide a 20KB image is a low quality image, a 2MB image is a high quality one.

  • KB = 1,000 bytes
  • MB = 1,000 kilobytes

Typical file size for images

Upload onto a WordPress website 100KB
Upload into MailChimp or e-newsletter 100KB
Download from Facebook 100KB
Emailing to a friend who has dreadful internet access 200KB
Graphic Designer or Web Editor preference 2MB
Taken on SmartPhone 2MB

Files size for images can change according to where you have posted the photo or how you have transported it.

For example, if you take a photo on a smartphone it's likely to be about 2MB in size.  However if you post it and then downloaded it from Facebook, it will end up as a 100KB size file.  However if you save the same photo to a USB, the photo will retain its 2MB original size.

A Graphic Designer or Web Editor will want the larger size photo as this gives them a higher quality image they can manipulate.  On the flip side, a friend with a dreadful internet connection will not look forward to a big sized file clogging up their inbox.

How to re-size your images for your website

As a website owner or editor you are going to create and use a lot of photos and images.  The better quality the images are, the better your site will look. However your site will slow down if the files are too big. It is recommended to size your photos to the dimensions recommended by your site and to keep file size to under 100KB.

This is also true if you are creating emails in MailChimp or other bulk email software programs.  If your file size is too big, it will slow down the delivery or download of your email.

You can allow the websites and email software to compress and re-size the images for you - but if you do this you have less control over how they look.

Watch Video Tutorial

The video below gives you a step by step guide on how to use to re-size images for websites.  This is a free, online program great for people who don't have Photoshop or other image manipulation software.

Click on the above image to play video

Re-size images using Preview on a Mac or Paint on a PC

How to open image in Windows Paint and re-size

More options to re-size images using Paint

Re-sizing images on a Mac using Preview

Here's a quick, under 2 minute video that explains aspect ratio of pictures - useful if your product shots are not lining up neatly in your online shop.

Good luck with your image re-sizing.

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