Increase Image Quality Online Free

Sharpen, upscale, and enhance any photo right in your browser. We use Pica (Lanczos resampling) for clean 2× upscaling and a three-pass WebGL unsharp-mask pipeline for crisp detail recovery, then drag the slider to compare before vs. after. No upload, no sign-up.

Upload Photo to Enhance

Drag and drop or click to select - we’ll auto-sharpen and upscale

Processing is 100% in-browser. Your image is never uploaded.

Guide

How to Increase Image Quality

1

Upload Your Photo

Drag and drop or choose any photo to enhance.

2

Wait for Enhancement

The tool sharpens edges and boosts clarity automatically.

3

Compare & Download

Compare before and after, then click Download for the enhanced result.

Pixellize free online tools illustration showing browser, file, and gear icons

Bring Soft Photos Back to Sharp

Phone photos taken in low light or indirectly through glass often look soft. The quality enhancer sharpens edges, lifts contrast, and recovers crispness without destroying skin tones or natural colors.

Useful for restoring scanned family photos, making product shots pop, and rescuing screen-grabbed images from compression artefacts.

Benefits

Why Use Our Image Quality Booster?

2× Lanczos Upscale

The tool upscales your photo to twice its original resolution using Pica, a high-quality JavaScript implementation of the Lanczos resampling algorithm. Lanczos preserves edge detail far better than browser-default bilinear scaling and is widely used in professional image editors for clean enlargement without blur or jaggies.

WebGL Unsharp Mask

After upscaling, the tool applies a three-pass unsharp-mask pipeline using WebGL via Glfx.js. Pass 1 (large radius) handles haze and global contrast, pass 2 (medium radius) defines edges and structure, pass 3 (small radius) restores micro-details for pixel-level crispness, running entirely on the GPU for speed.

Before / After Slider

Once enhancement is complete, drag the white slider handle left and right to compare the original and enhanced versions side-by-side. The before view shows your image at the new resolution without enhancement; the after view shows the full pipeline applied. Both share the exact same canvas size for honest pixel-to-pixel comparison.

Private, No Upload

Your image never leaves your device. Pica and Glfx.js both run entirely client-side using the HTML5 Canvas and WebGL APIs in your browser. No file is sent to any server, no account is needed, and nothing is stored. The downloaded JPG is generated locally from the enhanced canvas and saved directly to your device.

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FAQ

Frequently Asked Questions

Common questions about increasing image quality online.

Is this tool an AI image upscaler?
No, it does not run a neural network. It uses classical signal-processing techniques: Lanczos resampling for clean upscaling and three-pass unsharp masking for sharpening and contrast recovery. The results are excellent for sharpening and modest upscaling, but for extreme enlargements of low-resolution sources, dedicated AI upscalers may produce better fine-detail synthesis.
How much does the tool upscale my image?
The output is 2× the original resolution, so a 1000×800 photo becomes 2000×1600. To prevent browser crashes on very large inputs, the output width is capped at 4000 pixels. If your input is already wider than 2000 pixels, the upscale factor is reduced so the result stays under 4000 pixels wide while keeping aspect ratio intact.
Why does the tool need WebGL?
The unsharp-mask sharpening pipeline runs on the GPU via WebGL through Glfx.js, this makes it fast even on multi-megapixel images. If WebGL is not available in your browser, the tool falls back to the upscaled image without the sharpening pass. All current desktop and mobile browsers support WebGL by default.
Does the tool upload my photo to a server?
No. Pica and Glfx.js both run entirely in your browser using the HTML5 Canvas and WebGL APIs. Your image is loaded into a canvas element on your device and never transmitted to any server. The downloaded JPG is generated locally and saved directly to your device.
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