Real-ESRGAN - Free AI Image UpscalerReal-ESRGAN

Real-ESRGAN: Free AI Image Upscaler

Drop a JPG or PNG and Real-ESRGAN rebuilds it at up to 4x resolution — right in your browser. Nothing is uploaded, no account, no watermark. Free.

Checking image processing support...
Blurry portrait photo before Real-ESRGAN upscalingPortrait photo after 4x Real-ESRGAN upscaling — sharp skin and hair detail

What Real-ESRGAN Free AI Image Upscaler Does for You

Real-ESRGAN runs the general-x4v3 model right in your browser: drop a blurry image and get it back up to 4x larger, sharper, and cleaner — free, with nothing to install and nothing uploaded.

  • 4x Resolution, Real Detail
    A GAN trained on real-world degradation rebuilds edges and textures — 1024×768 in, 4096×3072 out.
  • Cleans Up JPEG Noise and Blur
    Compression blocks, soft focus, and ringing around text are removed while the image upscales.
  • Your Image Never Leaves Your Device
    Everything runs on your own GPU via WebGPU (WebGL fallback). No upload, nothing for us to store.
  • No Python, No CUDA, No Setup
    Works in current Chrome, Edge, Firefox, Safari, and Opera — on Mac, Windows, or Linux.

Why Use Real-ESRGAN Online Instead of the Desktop Build

The command-line version is excellent — if you enjoy installing things. This site keeps the model and removes the friction.

The desktop build means Git, Python, PyTorch, and a GPU driver that has to match. That's an afternoon before your first image. Here it's one tab and one drag.

Soft anime illustration before upscalingAnime illustration after Real-ESRGAN upscaling — crisp lines and colors

How to Upscale an Image with Real-ESRGAN — 3 Steps

No terminal, no settings screen. Three moves from blurry to sharp:

1

Drop Your Image

Choose a JPG, JPEG, or PNG up to 50 MB and 25 megapixels. Processing starts the moment the file lands — there's no Start button to find.

2

Real-ESRGAN Does the Work

The model loads once, then runs on your GPU while a progress bar tracks each stage: decode, enhance, export. Keep the tab open until the PNG is ready.

3

Compare and Download

Drag the slider to check the original against the result, then download a PNG up to 8192 px on the long side. No watermark, no account, no cap on how many you run.

What Powers Real-ESRGAN Free AI Image Upscaler

The same open-source model researchers publish, packaged for the browser. Here's what is actually running.

Real-ESRGAN general-x4v3

A 4x super-resolution GAN from the official Real-ESRGAN release, converted to ONNX and executed locally. Model weights are checksum-verified before every run.

WebGPU Execution, WebGL Fallback

ONNX Runtime Web drives the model on your GPU. Browsers without WebGPU fall back to a WebGL build of the same graph instead of failing outright.

Automatic 4x / 2x Routing

Source size and GPU tier decide the path: the full 4x pass for images up to about 2 megapixels, a 2x Anime4K network for larger files and mobile devices.

Tiled Inference

Large outputs are processed in tiles, so a 4096-px-wide result fits inside browser memory instead of exhausting it.

Lossless PNG Output

The enhanced image is exported as PNG, so nothing the model reconstructed gets thrown away by a second round of JPEG compression.

Video Tab Included

Need a clip instead of a still? Switch to the Video tab for 2x AI video upscaling with the same no-upload, in-browser pipeline.

Real-ESRGAN Free AI Image Upscaler by the Numbers

Research-grade upscaling with none of the overhead.

4x Max Upscale Factor

4x

Max Upscale Factor

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100% Free, No Signup

100%

Free, No Signup

Frequently Asked Questions

Straight answers about Real-ESRGAN online — what it does, what it costs, and where its limits are.

Upscale Your First Image with Real-ESRGAN — Free

No download, no signup, no watermark. Drop a JPG or PNG and see 4x in your browser.