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Enhance Image Quality Online for Free

Increase sharpness, resolution, and contrast of your photos and scanned documents directly in your browser.

Drop your files here

or pick them from your device

Controls edge enhancement intensity (25% recommended)
Enhances differentiation between shadows and highlights
Your files never leave this device.

How it works

  1. 01

    Añade tus archivos

    Upload one or multiple images (JPG, PNG, WebP, or BMP).

  2. 02

    Configura u ordena

    Select your enhancement mode (auto, document, or photo), scale multiplier, and sharpness level.

  3. 03

    Descarga el resultado

    Download your crisp, enhanced images instantly or packed in a ZIP file.

Digital signal & image processing

Spatial convolution and dynamic calibration algorithms

The engine runs a high-frequency Laplacian spatial unsharp mask across the RGB pixel matrix without introducing artificial compression ringing. In Document mode, it applies adaptive thresholding to darken typographic strokes while clearing yellowed or uneven background illumination from camera captures.

Recommended use cases

  • Sharpening mobile camera captures of receipts, handwritten notes, and paper documents.
  • Clarifying blurry low-resolution screenshots for technical slide decks.
  • Restoring contrast and edge fidelity in faded or compressed images with 100% in-browser privacy.

Technical constraints & trade-offs

  • Severe optical lens motion blur or extreme out-of-focus captures cannot synthesize completely missing microscopic details.
  • 2x upscaling resamples the canvas bicubically; for ultra-large files (>30 megapixels), 1x or 1.5x is recommended to conserve browser RAM.
Pro Tip:For photographed paper receipts with shadows, select 'Text / Scanned Document' with 30% sharpness: it will purify background paper tones and make typography punchy and readable.
Private in-browser processing with zero remote network upload
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Frequently asked questions

How does the image quality enhancement algorithm work?
The engine evaluates pixel spatial frequencies using an adaptive Laplacian unsharp mask that sharpens contours, borders, and textures without introducing excessive grain. It also balances contrast and brightness to recover lost shadow and highlight details.
What is the difference between Photo Mode and Document Mode?
Photo mode prioritizes smooth color gradients, balanced skin tones, and subtle edge definition. Document mode actively darkens text ink while whitening grayish or yellowed backgrounds to make invoices, receipts, and notes razor-sharp.
Can I increase the image resolution?
Yes. You can select 1.5x or 2x upscale factors, which resample pixels using high-precision bicubic interpolation before running the sharpening filter.
Which image formats are supported?
You can enhance JPG, PNG, WebP, and BMP files. PNG transparency channels (alpha masks) are preserved throughout the process.
Are my photos uploaded to any external server or AI cloud?
No. All pixel operations execute locally within your web browser memory using HTML5 Canvas. Your private photos and documents are never uploaded to the internet.
Can I enhance multiple pictures at once?
Yes. You can select multiple images simultaneously. BreadPDF processes them sequentially and packages them into a convenient ZIP archive for download.

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