Upscale Image Online
Enlarge a JPG, PNG, or WebP image to 4x its width and height using an offline AI model directly in your browser, without uploading your file to a server.
What this tool does
NexKit Upscale Image enlarges a JPG, PNG, or static WebP image to 4x its original width and height directly in your browser, using an offline AI super-resolution model. Unlike simple pixel stretching or bicubic resizing, the model reconstructs plausible fine detail as it enlarges the image.
This tool cannot recover information that was never present in the original photo - it produces a larger, sharper-looking image based on patterns the model has learned, not a true reconstruction of lost detail.
How it works
The image is processed in small overlapping tiles rather than all at once, which keeps memory use and per-step processing time bounded regardless of image size. Each tile is enlarged by the AI model and the tiles are stitched back together into the final image. Processing runs entirely in your browser and can take a few minutes for larger images.
Size limits and format support
This tool supports JPG, PNG, and static WebP images. To keep processing time reasonable in the browser, input images are limited in width, height, and total pixel count - very large photos are not supported in this version.
Privacy and local processing
Images are processed locally in your browser for this tool, using an offline AI model. NexKit does not upload selected images to a server for this workflow.
Frequently Asked Questions
Are my images uploaded?
No. Upscale Image processes supported images locally in your browser using an offline AI model. Files are not uploaded to NexKit servers by this tool.
Can this recover detail that was never in the original photo?
No. The AI model reconstructs plausible detail based on learned patterns, but it cannot recover information that was never captured in the original image.
Which formats are supported?
JPG, PNG, and static WebP.
Is there a size limit?
Yes. To keep browser processing time reasonable, this tool limits the input image's width, height, and total pixel count. Very large photos are not supported in this version.
How long does it take?
Processing time depends on image size and can take a few minutes for larger images. The image is processed in small tiles with progress shown as it works.
What AI model does this use?
A general-purpose 4x super-resolution model based on the open-source Real-ESRGAN project, running entirely offline in your browser.