Image Upscaler
Make small images bigger, up to 4 times their size, with smooth edges and crisp detail.
- 100% private Files stay on your device
- Free No sign-up or watermark
- Fast Results in seconds
How to use Image Upscaler
- Add one or more images.
- Choose 2x, 3x or 4x and the edge sharpening level.
- Click Upscale image.
- Download the larger images.
Why use PDFFlow Image Upscaler
Up to 4x larger
Double, triple or quadruple the width and height of any image.
High-quality resampling
Lanczos resampling with edge sharpening gives smoother, crisper results than basic resizing.
Batch upscale
Upscale many images in one go and download them together as a ZIP.
Frequently asked questions
How do I increase image resolution?
Upload the image, choose 2x, 3x or 4x and click Upscale. The image upscaler enlarges it with high-quality resampling and sharpening.
How large can the result be?
Up to about 16 megapixels, the largest image most browsers can create. Bigger requests are upscaled as far as that limit allows.
Does it add detail that was not in the photo?
The upscaler uses high-quality Lanczos resampling and sharpening to enlarge the image smoothly. It does not invent new detail, so very small or blurry images will still look soft.
Which formats are supported?
JPG, PNG, WEBP, GIF and BMP. Save in the same format or choose JPG or PNG.
Are my files uploaded to a server?
No. PDFFlow processes your files entirely inside your browser using JavaScript. Nothing is uploaded, stored or seen by anyone else, and the result is created on your own device.
Is this tool free?
Yes. Every PDFFlow tool is free to use with no sign-up, no watermark added to your files and no daily task limit.