Lightroom Classic: Export not as sharp as in Lightroom itself

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Hi, I'm a wedding photographer and so use Lightroom frequently to edit and export my images. I have just exported a whole gallery of images and I have realised that the images are not as sharp as they are before export. I upload them to Pixieset for an online gallery but that doesn't seem to be the issue as I checked the images saved in an external hard drive and they are the same. My export setting haven't changed - resize to fit long edge 2,048 and 72dpi, also as jpeg. 
I'm at a loss as to what's wrong! Any help would be greatly appreciated.
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Samantha Ramsay

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Posted 4 weeks ago

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Todd Shaner, Champion

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I assume you are using Lightroom Classic. In the Export module make sure Output Sharpening is checked and set to Screen Standard
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Samantha Ramsay

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Hi Todd, thank you for taking the time to answer. I have actually always been advised not to check output sharpening unless it's to export for print. I read a couple of articles today and they also say the same. As I've never checked it for exporting I dont think this is the issue.
In lightroom the images are all pin sharp but on exporting they're just not to the same standard which is becoming very frustrating.
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Todd Shaner, Champion

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Output Sharpening should not be applied if 'Resize to Fit' is unchecked, such as when Exporting full-size image files. You said, "My export setting haven't changed - resize to fit long edge 2,048 and 72dpi, also as jpeg."

Anytime an image is resized output sharpening must be applied to restore edge sharpness lost during the resizing interpolation process. You can adjust the settings based on the target usage (Screen or Print), which applies slightly different sharpening algorithms. Explanation at the below Link. Give it a try!

https://laurashoe.com/2012/07/11/sharpening-in-lightroom-part-three-output-sharpening/
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Samantha Ramsay

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Thank you very much for passing on the link, all very helpful thank you.
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Todd Shaner, Champion

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Glad to help. If the Export JPEG files with Output Sharpening applied are still not sharp there are some other things we can investigate.