Image Upscaler
Enhance low-quality images to high resolution. 2x-4x upscale with sharpening. 100% browser-based, no server upload.
About This Tool
Image Upscaler enlarges your low-resolution images to 2x or 4x their original size while preserving sharpness and detail. Using advanced interpolation techniques running entirely in your browser, it is ideal for enhancing old photos, upscaling icons, and preparing small images for print.
Drag & drop image or click to upload
JPG, PNG, WebP ยท Max 20MB
Uses advanced interpolation, not AI-based upscaling.
Quality may differ from professional AI upscaling tools.
Your images are processed locally and never uploaded to any server.
How to Use
- Upload an image by dragging or clicking. (JPG, PNG, WebP / max 20MB)
- Select scale factor (2x, 3x, 4x). The result resolution is shown automatically.
- Adjust sharpening intensity and noise reduction options.
- Choose the output format and click the "Upscale" button.
- Compare the result with the Before/After slider, then click Download.
What is Image Upscaling?
Image upscaling is the process of increasing the pixel count of a low-resolution image to create a larger, higher-resolution version. This uses interpolation algorithms to calculate new pixel values between existing ones.
This tool leverages the browser's high-quality interpolation (Bicubic family) and additionally applies an Unsharp Mask sharpening filter to enhance clarity in the upscaled image. The noise reduction option helps minimize artifacts that may appear during upscaling.
Use Cases
- Restoring and enlarging old photos
- Enlarging small images for print
- Converting web thumbnails to high resolution
- Enlarging images for social media
Frequently Asked Questions
Is this an AI upscaler?
No. This tool uses high-quality interpolation via the browser's Canvas API. While it may not match dedicated AI upscalers (like Real-ESRGAN), it's completely free, private, and requires no server upload.
What image formats are supported?
Input: Any image format supported by your browser, including JPEG, PNG, and WebP. Output: PNG (default, lossless), JPEG (with quality control), or WebP.
Does 4x upscaling improve quality?
Higher scale factors make the image larger but can't create detail that isn't in the original. Sharpening helps improve clarity, and 2x upscaling typically provides the most natural results.
Is there a file size limit?
You can upload images up to 20MB. All processing happens in your browser, so upscaling very large images at high scale factors may take longer.
Is my image uploaded to a server?
No. All processing happens in your browser using the Canvas API. Your images are never sent to any external server, ensuring complete privacy.
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How It Works
The uploaded image is drawn onto a large HTML5 Canvas at the selected scale (2x or 4x). The browser's built-in rendering pipeline applies high-quality bicubic interpolation during the drawImage() upscale. An optional sharpening pass using a convolution filter on the Canvas pixel data (via getImageData/putImageData) enhances edges and reduces the soft look typical of simple interpolation. The final result is exported as a PNG or JPEG blob.
All image processing is performed client-side using the Canvas API and typed-array pixel manipulation. Your images never leave the browser โ zero server contact, zero privacy risk.