If you just need to bulk optimize a ton of old images, ShortPixel also has one-time plans that start at $9.99 for up to 10,000 images.
Given how well ShortPixel is able to compress images, I think this price is definitely fair, especially because most bloggers can probably use the free plan.
Compressing your blog images is not an option but an important aspect of a faster-loading blog. A lot of users miss out on doing this which results in slow page loading complaints.
Moreover, when you compress images, you also save your hosting special marketing lead bandwidth which is great for anyone using a metered Webhosting for hosting their blog. I have used/tested a lot of WordPress image compression plugins and also talked about those here.
ShortPixel clearly stands out among all and is one of the top choices of ShoutMeLoud readers. After you install and configure ShortPixel plugin, everything is automated.
For occasional (hobby bloggers), 100 free images/month is a decent number. For serious bloggers, buying a monthly or even a one-time package is a good choice.
The first time when I learnt about the image compression technology, I bought the one-time license and compressed all my images. The result was significant and something I recommend every WordPress blogger to try.
My recommendation is to start by using their free plan and notice the image size after compression. You can also take note of page loading (if you can) along with the bandwidth saving.
Get your ShortPixel free API Key
You should also consider using a CDN along with image compression to further speed up your WordPress blog. I have been using CloudFlare for last two years and I’m very satisfied.