Upscale PDF Images online
Locate low-resolution embedded PDF images and enhance them by 2x or 4x using spatial convolution sharpening.
Drag & Drop PDF file
or click to browse from your device
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.
How Image Upscaling Works
Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our AI Upscaler and All Tools utilities.
Upload PDF
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Detect Images
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Upscale 2x or 4x
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Enhancement Features
Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:
Bicubic Interpolation
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Sharpening
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Artifact Reduction
Full digital precision and optimized performance with zero server-side latency or external data transfers.
100% Offline
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Frequently Asked Questions About Image Upscaling
Is this PDF image upscaler free?
Yes. Upscale unlimited PDF images with no registration.
Which upscale factors are supported?
2x and 4x upscaling with bicubic interpolation for high-quality enhancement offline.
Does it reduce artifacts?
Yes. Built-in artifact reduction and sharpening filters for clean output offline.
Do you store PDFs here?
No. All processing happens locally with complete privacy.