AI Image Upscaler
Real AI super-resolution (ESRGAN via UpscalerJS / TensorFlow.js), not a simple resize — runs entirely in your browser. The AI model downloads only when you tap AI Upscale (one-time, cached after). Images larger than 1600px on their longest side aren't accepted, to avoid crashing your browser tab.
Choose an image (JPG, PNG, or WEBP)"Higher quality" uses a larger AI model — noticeably better detail, but meaningfully slower, especially on phones. Default is the model UpscalerJS's own maintainers recommend for browser use.
About the AI Image Upscaler
AI Image Upscaler increases resolution using a real AI super-resolution model (an ESRGAN-family network, run via UpscalerJS and TensorFlow.js) — not a simple resize or sharpen filter. By default it uses the lighter model tier that UpscalerJS's own maintainers specifically document as built for browser use, rather than automatically reaching for the largest, slowest option. A “Higher quality (slower)” toggle is available if you'd rather trade speed for a larger model.
Features
- Real AI super-resolution, not a basic resize or sharpen filter
- 2x and 4x scale options
- Optional higher-quality model tier for slower, more detailed results
- Before/after comparison slider
- Paste directly from clipboard, drag and drop, or browse
- Automatic safety limit to prevent browser memory crashes on very large images
How to Use
Upload an image (drag and drop, browse, or paste from clipboard), choose 2x or 4x, then tap AI Upscale. The AI model downloads once on first use and is cached afterward. Compare before/after with the slider, then download your result.
Benefits
- Nothing is uploaded — the AI model and all processing run locally in your browser
- Fast default model choice means a quick first-use download instead of a long wait
- No signup, no watermark
Frequently Asked Questions
Why not always use the highest-quality AI model?
The larger model tier is genuinely better on detailed images, but its own library documentation describes it as best suited to a machine with a GPU, with significant latency in a plain browser tab. Defaulting to it would mean a slow, frustrating experience for most people, so the lighter, browser-optimized tier is the default — the higher-quality option is there if you want to wait for it.
Why isn't 8x offered?
UpscalerJS's own model documentation states that its 8x model doesn't work reliably in a browser environment. Rather than offer something the library's own maintainers describe as unreliable, this tool caps out at 4x.
Will this fix a blurry or low-quality photo perfectly?
It will meaningfully improve sharpness, texture, and edge clarity on most photos, but it can't invent detail that was never captured — severely blurry or heavily compressed source images will still show their original limitations, just less harshly.
Is my photo uploaded anywhere?
No — both the AI model and all image processing run entirely inside your browser. Your photo is never sent to a server.