ZEnhancer

ZEnhancer is a browser-based AI photo enhancer covering the standard fixes — sharpening blur, cutting noise, brightening dark shots, restoring old photos, 4K upscaling, text clarification, background removal and colorizing black-and-white images — with a generous free tier: 10 credits per UTC day for single images, no account required. Before/after comparison previews, JPG/PNG/WebP support and mobile-browser compatibility round it out.

The photo-enhancer space is a wall of near-identical tools, so the differentiators are the generous no-sign-in daily allowance, the breadth of adjacent utilities (converters and other image tools on the same domain), and it being genuinely free for light use rather than free-trial-then-paywall.

Who it's for: casual users fixing family photos, marketplace sellers cleaning up product shots, and anyone who needs an occasional enhancement without another account. Volume users will hit the daily credit wall and should compare paid tiers against alternatives — but for a few photos a day, it does the job at the best price point possible: zero.