Database / Supabase Intermediate to Advanced Interview Questions

How does Supabase's image transformation feature resize images without a separate CDN service?

Supabase Storage can transform images on the fly by appending query parameters to the file's URL — requesting a specific width, height, or quality — rather than requiring you to pre-generate and store multiple resized copies of every image.

https://project.supabase.co/storage/v1/render/image/public/avatars/user1.png?width=200&height=200

The transformation happens at the storage/CDN layer itself and the resulting resized image is cached, so repeated requests for the same dimensions are served quickly without re-processing. This avoids the common pattern of running a separate image-processing service or pre-computing thumbnail variants ahead of time for every size an app might need.

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How do you request a resized image from Supabase Storage? By writing a custom Edge Function for every image

✗ Try again, that's not it.

By uploading a second, manually resized copy

✗ Try again, that's not it.

By appending width/height query parameters to the file's URL

✓ Correct! Well done.

It isn't possible without an external service

✗ Try again, that's not it.

What happens to a transformed image after it's first generated? It overwrites the original file

✗ Try again, that's not it.

It's cached so repeated requests for the same size are served quickly

✓ Correct! Well done.

It's only ever generated once per project, not per size

✗ Try again, that's not it.

It's deleted immediately after serving

✗ Try again, that's not it.

More Related questions...

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