PDF Image Quality Enhancer
Enhance the quality of all images in a PDF using AI super-resolution and rebuild the document.
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How do you like this tool?
How to use
Upload your PDF
Select a PDF file from your device. All processing happens locally in your browser.
Preview extracted images
All images found in the PDF are displayed in a grid so you can review them before enhancement.
Enhance image quality
Click 'Enhance Image Quality' to upscale all images to 2× resolution using the Swin2SR AI model. The images will have more pixels but will fit the same size in the PDF.
Download enhanced PDF
Once all images are enhanced, click 'Generate & Download Enhanced PDF' to rebuild the document with the improved images.
Use cases
Improve scanned document quality
"Enhance the resolution of scanned pages and photos in PDF documents for better readability."
Sharpen presentation images
"Improve the quality of charts, diagrams, and photos in PDF presentations before sharing."
Restore old PDF catalogs
"Upscale low-resolution product images in older PDF brochures and catalogs for modern displays."
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Frequently Asked Questions
?How does the PDF image quality enhancement work?
The tool extracts all images from the PDF, enhances each one using the Swin2SR AI super-resolution model at 2× resolution, and then rebuilds the PDF with the improved images in their original positions.
?Is my PDF data secure?
Yes. All processing happens entirely in your browser using WebAssembly. Your PDF is never uploaded to any server, ensuring complete privacy and data security.
?What does 2× upscaling mean?
Each image's pixel count is doubled in both width and height (4× total pixels), resulting in sharper and more detailed images. The images are then embedded back into the PDF at their original display size.
?Will the PDF layout change after enhancement?
No. The enhanced images are embedded at the same display size as the originals. Only the underlying pixel resolution improves, so the layout remains unchanged.
?How long does enhancement take?
The first run downloads the AI model (~5–15 MB), which is cached for future use. Each image typically takes a few seconds to process depending on its size and your device.
?Is there a limit on the number of images?
There is no hard limit. The tool enhances all images found in the PDF. Performance depends on your device's memory and the PDF size.
?What image formats are supported?
The tool extracts and enhances all embedded images in the PDF regardless of their original format (JPEG, PNG, etc.). Enhanced images are embedded as high-quality PNG.
?Is this tool free to use?
Yes, the PDF Image Quality Enhancer is completely free. There are no usage limits, watermarks, or hidden fees.