I would recommend using an image editor – personally I use photoshop – but there are plenty of free / online / other ones available.
 
There are two things when it comes to saving images for blogs / websites –

The physical size and the file size.

The bigger the physical size (pixels) of the image, it’ll likely be bigger in file size (kb).

If you first look at the physical size and make it only as big as it needs to be, this will decrease the file size naturally.

The physical size of the image should only be as big as your blog width. It’s unlikely that you’ll ever need that image bigger (when using for your blog) so uploading a larger sized image will increase page load time, and use peoples bandwidth/data for no reason – think about the people loading your site from a mobile, do you really wanna use up all their mobile data (and time) on loading your images in?!

Correct images for blogging - Image by Dion Almuena via unsplash

Once you’ve adjusted the physical size of the image you can look at saving out the image ‘for web’. Photoshop has this as a saving option by default which is why I love using it. When you save for web you can save the image out at a lower file size that doesn’t affect the quality of the image. I would recommend JPG (or PNG if you need transparency).

Don’t have photoshop? Don’t worry, as I mentioned above there are plenty of online tools available, here are a few:

Search Engine Optimisation Tip: Try not to add text to your images. Why? Google and other search engines don’t see that text, so if you’re using text on images as a heading – don’t! Pop that heading in the text of your blog post so it can be read by the search engine spiders of the world.

I hope this blog post was helpful – let me know in the comments if you found it interesting and would like more posts like this!

Laura

Correct images for blogging – Image by Dion Almuena via unsplash