Upscale PDF Images online
Locate low-resolution embedded PDF images and enhance them by 2x or 4x using spatial convolution sharpening.
How it Works
Enhance embedded images in your PDF document in 3 simple steps.
Upload PDF Document
Select the PDF file containing the images you want to upscale or drag it into the browser window.
Scan & Select Images
The tool scans the document, lists all embedded images, and automatically tags low-resolution ones.
Enhance & Download
Configure upscale ratio (2x/4x) and sharpening filters, then generate and download your updated PDF.
Why upscale PDF images?
Avoid uploading private business brochures or legal scans to cloud APIs. CanvaTools runs fully in your browser sandbox.
100% Client-Side Privacy
Your documents never leave your local device. The upscaling and sharpening run entirely within client-side memory.
Spatial Convolution Sharpening
Applies real-time 3x3 pixel kernel convolution to enhance details and crisp up edges.
Artifact Noise Suppression
Suppresses background noise and pixelation artifacts from low-quality scanned pages.
Frequently Asked Questions
Common queries regarding client-side PDF image upscaling.
Q.Does this upload my PDF to any server?
No. The document scanning, image decoding, upscaling, sharpening, and saving run entirely on your local CPU and GPU within your web browser.
Q.Can I adjust the upscale multiplier?
Yes. You can select either 2X or 4X scaling parameters depending on your desired output resolution and memory constraints.
Q.How does the sharpening filter work?
The tool applies a spatial convolution matrix filter over the pixel array of the scaled image to enhance edge boundaries and reduce scaling blur.
Q.Will my text formatting be affected?
No. The tool replaces only the raw image XObject streams inside the PDF object tree, preserving the exact text layers, layout, fonts, and forms.