Bigjpg

A 16x maximum enlarging ratio is the headline spec on Bigjpg's paid plans, up from 4x on the free tier.

Bigjpg is an AI image upscaler that enlarges pictures online, and it is also listed for anime art, photo restoration and API use.

The free plan covers 20 pictures a month with slow speed on a shared server and a 5MB upload limit.

Paid plans lift the upload cap to 50MB and add top priority speed, a high performance server, parallel enlarging and batch mode.

Offline enlarging is included on every plan.

Pricing is by duration rather than a monthly subscription.

Basic is $6 for 2 months and 500 pictures a month.

Standard is $12 for 6 months and 1000 pictures a month.

Premium is $22 for 12 months and 2000 pictures a month.

If you only upscale the odd image, the free tier may be enough.

Large batches are where the paid plans matter.