How to disable WordPress from creating thumbnails?

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These are some thoughts on disabling WordPress from creating multiple thumbnails, it might work for you and might not depends on the theme yo have, plugins etc …

– Turn off any plugins.
– Switch to your default theme.
– Set all image sizes to 0 in the Settings –> Media settings.

disable WordPress from creating thumbnails

This should keep WP from generating those extra thumbnails sizes. WP should creates only one additional thumbnail around 20-25Kb

If this doesn’t work for you, then either a plugin or the theme you are using is making some changes.

Some themes have functions like add_image_size, set_post_thumbnail_size or update_option('large_size_w', 500); in the functions.php file, so you will need to check that file.

hope it helps

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