Best tool to upscale NanoBanana Pro images?

I’m using NanoBanana Pro generate frames for some VEO 3 videos, but the images lose quality once I start editing them into the timeline. I’m looking for a solid online upscaler that actually improves the resolution without messing up the details. Free or paid, I don’t mind — just want something reliable.

Also, when you upscale, do you usually stick to 2x or go higher? Does going beyond 2x start ruining the image, or does it depend on the tool?

Any recommendations would help. Thanks in advance.

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