What it does
MockCat offers browser tools for screenshots, app-store images, clothing, mugs, books and posters. Its screenshot generator provides frames, backgrounds and PNG output without an account or watermark. The product tools present existing artwork rather than create the underlying design.
MockCat's screenshot tool accepts a file, drag-and-drop image or clipboard paste. PNG, JPEG and WebP inputs can be up to 20 MB and 32 megapixels. The whole image is used initially; optional crops and repositioning let you fit a different shape before adding a browser, desktop-window, phone, tablet or laptop frame.
Padding, rounded corners, shadows and tilt sit alongside gradient, transparent and scene backgrounds. The device outlines are generic drawn frames, rather than official hardware renders. MockCat says the editing stays in the browser and the original screenshot is not uploaded.
Export a PNG at 1× or 2×, or copy the result to the clipboard. Outputs are capped at 4096 pixels on the longest edge and 8 megapixels, so larger requests are scaled down; the tool shows the actual dimensions. This free workflow has no account requirement or watermark. Its terms leave users responsible for image rights and do not promise compliance with an app store's submission rules.
Strengths
- The screenshot editor gives exact input and output size limits.
- Local browser processing needs no account and adds no watermark.
Watch out for
- Large exports are reduced to the stated pixel limits.
- Generic device frames are not official hardware renderings.
Best for
- Simple artwork and screenshot presentation images
Sources
- MockCat — curated mockup generator with no watermark (Oct 27, 2026)
- Screenshot Mockup Generator | MockCat (Oct 27, 2026)
- Best free Smartmockups alternative (2026) — honest comparison | MockCat (Oct 27, 2026)
- Terms of Use | MockCat | MockCat (Oct 27, 2026)