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WKO AI

Three super-resolution models · self-hosted by WKO AI

Free image upscaling that stays in your browser

Enlarge images 2x or 4x without uploading them. Pick a model for speed, clean detail, JPEG artifacts, or noisy real-world photos; inference runs locally and the weights come from our own domain.

Try it free

Your first upscale

  1. 1. Choose a source image

    Open Upscale and choose a small image first. Your source stays in the browser. Larger images need more working memory.

  2. 2. Pick 2x or 4x

    Start with Lightweight 2x for speed. Choose a 4x model for more output pixels. Check download sizes below and device compatibility in the studio.

  3. 3. Approve and review

    Approve the first model download, run the upscale, and compare the result before saving. CPU fallback may take longer.

Actual studio results

Compare the same input at 2x and 4x

We reduced the 512×512 generated example to 128×128, then processed that input through both upscalers in WKO AI. Each preview uses the same display area; the source is enlarged for comparison.

Source: ceramic teapot and plant on a wooden table, 128 by 128 pixels

Source · 128×128

Reduced input

Download PNG
2x output: ceramic teapot and plant on a wooden table, 256 by 256 pixels

2x output · 256×256

Swin2SR Lightweight 2x

Download PNG
4x output: ceramic teapot and plant on a wooden table, 512 by 512 pixels

4x output · 512×512

Real-ESRGAN General x4v3

Download PNG

Upscaling changes texture and sharpness; it cannot guarantee recovery of original detail. Compare the full-size PNGs before choosing a result. These examples have no additional sharpening or retouching.

Choose the right restoration

Three verified models, one private tool

Every shipped weight carries a permissive license (Apache-2.0 or BSD-3-Clause), is SHA-256 verified during mirroring, sits below Cloudflare's 25 MiB asset limit, and is cached by your browser after the first use.

ModelScaleFormatSizeBest for
Swin2SR Lightweight 2xdefault 2x 2x fp32 8.08 MB Speed on any device
Real-ESRGAN General x4v3default 4x 4x fp32 4.87 MB Photos, screenshots, JPEGs
Swin2SR Classical 4x 4x q8 21.6 MB Clean-source 4x fidelity

Local and private

Your source image and upscaled output stay on your device. Only static model assets are downloaded.

Free and unlimited

No credits, account, watermark, or server-side processing bill. Your device performs the inference.

Direct model downloads

Each model page includes exact bytes, SHA-256, license attribution, and the same ONNX file used by the studio.

Try it free