Upscale Image
Enlarge images 2× or 4× with high-quality bicubic scaling and optional sharpening
Drop images here
or click to browse files
When to upscale an image?
Print at High DPI
A 1200 px photo printed at 300 DPI only produces a 10 cm print. Upscale 4× to get 4800 px — enough for A3 at 300 DPI.
Old Low-Res Photos
Restore scanned photos or low-resolution images to a displayable size without visible pixelation.
Social & Presentations
Upscale small product images or screenshots to meet minimum size requirements for LinkedIn, slides, and marketing.
How it works
Upload
Drop your low-res image — JPG, PNG, or WebP up to 50 MB.
Choose Scale
Select 2× (balanced) or 4× (maximum). Output dimensions are shown in real time.
Enable Sharpen
Toggle the Sharpen Filter to apply an unsharp mask after scaling for crisper edges.
Download
Process and download the upscaled JPEG — all done in your browser.
Who uses this tool?
Print & Design
Enlarge source images to meet high-DPI print requirements without blurriness.
Photographers
Recover usable sizes from old, low-resolution scans and film photos.
E-commerce
Upscale product images that don't meet marketplace minimum resolution requirements.
Educators
Enlarge diagrams and screenshots for presentations and printed handouts.
Frequently Asked Questions
Does upscaling actually add detail?
Browser-based upscaling uses bicubic interpolation — it is smooth but does not add new detail. True AI upscaling requires GPU compute.
What does the Sharpen Filter do?
It applies a 3×3 unsharp mask convolution kernel after scaling, which enhances edge contrast and perceived sharpness.
Will 4× make the file very large?
Yes — a 500×500 px image becomes 2000×2000 px at 4×, typically 1–3 MB as JPEG. Make sure you need that size.
Is there a maximum input size?
Input is limited to 50 MB. Very large inputs at 4× may be slow on low-end devices due to Canvas memory usage.
About this tool
VisualDocs's upscaler uses high-quality bicubic interpolation with an optional sharpening pass to enlarge images 2× or 4× — processed entirely client-side.