Do I need an account to remove backgrounds?
Short answer
No. Upload, remove, download — no email, no password. A free account is optional and only adds convenience: it keeps your processed images in "My Images" so you can re-download them later from any device.
The account exists for people who process the same images across devices or want a history; it does not unlock quality, resolution or quantity, because none of those are limited.
Developers do need an account for the API dashboard, where keys are created and credits are tracked — and buying credits creates that account from the checkout email automatically.