About Image Upscaler
A free tool for making images larger, without the softness a plain resize leaves behind.
What it is
Image Upscaler enlarges images 2x or 4x with an AI model, in the browser or over a REST API. It handles JPG, PNG, and WebP, with a photo model and an illustration model, and a before and after view for every file. The output dimensions are exactly the factor you choose times the input dimensions, so nothing is silently cropped or reshaped.
It is free to use without an account. Paid plans raise the limits and add API access, at a flat monthly price with no per-image fee at any volume. The limits shown on the site are read from the same configuration the server enforces, so what is advertised is what is allowed.
Who operates it
Image Upscaler is a product of Substrate Apps, an independent software studio building focused tools that each do one job well. There is no advertising, no venture capital, and no third-party advertising trackers anywhere on this site.
I spent twenty years building and running my own companies, and I fixed up a great many product photos along the way. Every tool I used to enlarge an image either metered me per image, made me sign up before it would do anything, or quietly kept the files. So I built the one I wanted: a flat price, no per-image fee at any volume, and nothing kept.
How we test
The specific figures quoted for this tool are measured on real files, not estimated. The benchmark block on the marketing pages carries the date it was run, the sizes it ran at, and the numbers it produced, so a figure that ages can be seen to have aged. Where a number is a range rather than one measurement, it is written as a range.
The tool is checked the same way. The output dimensions are exactly the factor times the input dimensions, the pixel cap is refused before any inference runs rather than after, and the test suite proves both by calling the service directly and reading what came back. A claim on this site that the code does not enforce is treated as a bug.
Privacy
Images are stored privately and never in a public bucket. The only way to reach one is a signed link generated for you, which expires after 15 minutes. Images upscaled with the browser tool are deleted within one hour, and files uploaded through the API are deleted within 24 hours, by a job that runs on a schedule. Metadata, including GPS coordinates and camera details, is stripped from every image by default rather than as an option you have to find. Your images are not looked at, not sold, and no model is trained on them. The full detail is in the privacy policy.
Contact
Questions, bug reports, and security disclosures can go to [email protected]. Security reports are welcome and will be thanked, not lawyered.