99% of my photos are for the web - why does Lightroom make such bad quality small files + a possible

What is SEO?

What are their upload requirements?

It would also help if you:

• Let us know the version of LrC and OS you are using?
• What are the options you select in Exporting in LrC?
• Does SEO perform any post processing of specific types of files?
• How are you exporting the files to be used by compressor.io? What are the options in compressor.io you are selecting.

There are multiple points in your worflow we need to understand more about.

I have never had this problem with Lightroom Classic.

Show us screen captures of your Export dialog box, the sections entitled File Settings, Image Sizing and Output Sharpening. (You may need more than one screen capture). Include the screen captures in your reply by clicking on the "Insert Photos" icon. Do not attach files.

What is the size in pixels (width and height) of the original image? (Do not tell me megabytes)

Show us the poor quality in one of these exports.

Define 'small files' and what format you're using from Lightroom Classic.

As suggsted, provide screen captures of what you find "bad quality' and ideally, upload via something like Dropbox or similar, the master image if you can (raw or otherwise) so others can examine the original and export using defined settings (by you) to see the results.

As for output to JPEG, you may want to view:

http://regex.info/blog/lightroom-goodies/jpeg-quality

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@Neil W.22976602evmv wrote:

I have had an extra step in my workflow which I have to pay for separately for to compress the files https://compressor.io/

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The fact that you have to pay for it is a big sign. Adobe uses the same engine in Lightroom as it does in Photoshop. It balances quality and speed. If you want much better quality at the same size, it will be much slower to export files. 

Do note that a recent bug was discovered if you export using the limited by file size option and you use any of the editing masks. It radically lowers the export quality because it forgets to take out the size of the mask from the file size calculation and lowers the quality so much that it looks horrible. This should be fixed soon.

Please post some examples of exported files processed in Lightroom and in Compressor.

Do not attach the files, use the Insert photos button in the toolbar.