Lanczos3 AI Image Upscaler

Upscale photos 2x, 4x, or 8x with Lanczos3 WebWorker & WASM super-sampling & unsharp mask detail sharpening. Zero quality loss.

Pica WASM + WebWorker Engine (Peak Performance)

100% Local & Private (No Uploads)

Image Upscaler

Enhance photo resolution & fine structural details with Lanczos3 WASM AI precision.

Scale Factor

Detail Enhancement High

Noise Reduction Moderate

Output Format

PNG (Lossless HD)

JPEG (High Quality)

System Ready • Drop image or configure settings

Drag and drop photo here

Supports PNG, JPG, WebP & HEIC up to 8x HD enhancement.

Original (1x) Upscaled (4x)

Download Upscaled Image

Upscaling Diagnostics & Metrics Report

Resolution Scaling 0px ➔ 0px

Pixel Expansion +0 MP

Sampling Engine Lanczos3 Sinc WASM

Filter & Sharpen Smart Unsharp Mask

Canvas Surface 400% Enlargement

Output Specs PNG Lossless HD

Frequently Asked Questions

Is this AI Image Upscaler completely free?

Yes! WebToolkitBox AI Image Upscaler is 100% free with unlimited image processing, zero subscription fees, and no sign-up required.

Are my uploaded photos kept private?

Yes! All upscaling and image enhancement runs 100% locally inside your web browser using WebAssembly and Lanczos3 GPU acceleration. Your photos are never uploaded to any remote server.