Image Upscaler

What does this tool do?

Image Upscaler enlarges your photos to 2x, 3x, or 4x their original size while preserving and enhancing detail. Unlike simple resizing (which produces blurry results), our tool uses multi-pass interpolation with edge-aware sharpening and optional denoising to give you sharp, clean output.

How it works

1. Upload any JPG, PNG, WebP, or GIF image (up to 20 MB).
2. Choose scale (2x/3x/4x), algorithm (Smart/Smooth/Sharp), and adjust sharpness and denoise.
3. Click Upscale Image — processing is 100% in your browser, no upload to any server.
4. Compare before/after with the interactive slider, then download in PNG/JPG/WebP.

Algorithm modes explained

• Smart (Edge-Aware) — detects edges and applies targeted sharpening. Best for most photos and mixed content. Recommended default.
• Smooth (Photo) — gentle interpolation, minimal sharpening. Best for portraits, landscapes, and natural photos.
• Sharp (Art/Text) — aggressive sharpening. Best for anime, illustrations, screenshots with text, and line art.

Why use this instead of an AI image upscaler?

• Free, no signup, no limits — while services like Let's Enhance ($9/mo) and Upscale.media cap free users, this tool is 100% free with no daily limits.
• 100% private — your image never leaves your browser. No upload, no server-side processing.
• Works offline — once loaded, the page works without internet.
• Multiple algorithms — choose the right mode for your content (photo vs. art vs. text).
• Adjustable sharpness and denoise — fine-tune output to your needs.

Common use cases

• Print preparation — upscale a small image to print-quality resolution.
• Old photo restoration — enlarge scanned photos for archiving.
• AI-generated art — enlarge 512x512 generations to 2K/4K for sharing.
• Product photography — increase resolution for marketplace requirements.
• Social media — enlarge thumbnails or screenshots for presentations.

Frequently asked questions

How large can my input image be?

Up to 20 MB. Output resolution is limited by your device's available memory; very large outputs (e.g., 4x on a 4000x3000 image) may be slow on low-RAM devices.

What is the maximum output resolution?

For 4x upscale, a 1000x1000 image becomes 4000x4000. The actual limit depends on your browser's Canvas support (most support up to 16384 pixels per dimension).

Is this a true AI upscaler like Real-ESRGAN?

This tool uses advanced classical algorithms (multi-pass interpolation, Sobel edge detection, unsharp masking, and adaptive filtering) running entirely in your browser. While not a neural network, it produces visibly better results than basic resizing. For true AI upscaling, services like Real-ESRGAN require server-side GPU processing and typically charge per use or limit free users.

Why are JPG files smaller than PNG files?

JPG uses lossy compression and is ideal for photos. PNG is lossless and better for graphics with text or transparency. WebP is a modern format with better compression than both.

Can I upscale animated GIFs?

Only the first frame is upscaled. Animated GIFs require per-frame processing, which is not supported in this tool.