Image Upscaler
Enlarge an image 2× to 4× with sharp edges.
Enlarge an Image Without Jagged Edges
A small picture stretched to fit a print or a banner turns blocky or blurry. This upscaler enlarges it the way professional editors do: Lanczos resampling, which weighs the surrounding pixels to rebuild smooth edges, carried out in linear light so dark and bright areas blend correctly, followed by a touch of edge sharpening you can control.
Choose 1.5× to 4×, see the new size before you start, and compare the result in the preview. It is honest maths: an enlarged image is smoother and larger, but detail that the camera never captured — individual hairs, tiny text — cannot be invented. For logos and graphics, recreating them as vector art is the only truly lossless way to go bigger.
Key features
- 1.5×, 2×, 3× or 4× enlargement, up to 64 megapixels.
- Lanczos-3 resampling in linear light.
- Adjustable edge sharpening from none to strong.
- Transparency preserved without dark fringes.
- PNG, JPG or WebP output.
This tool does its work inside your browser using native Web APIs. The files and text you give it are processed on your device and are not uploaded to our servers.
How to use: Image Upscaler
- Open the image
Drop a JPG, PNG or WebP onto the box. - Pick the factor
Choose how much to enlarge; the new size is shown. - Set sharpening
Light sharpening suits most photos; none for pixel-perfect graphics. - Download
Wait for the progress bar, check the preview, then download.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Media |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Is this AI upscaling?
No. It is high-quality mathematical interpolation. AI upscalers guess new detail, which can look impressive but also invents things; this one only makes the existing detail larger and smoother.
What is the largest output?
About 64 megapixels (for example 8000 × 8000), the most a browser can reliably hold and encode.
Should I upscale before printing?
If the print shop needs a pixel count your image lacks, upscaling to that size gives smoother results than letting the printer stretch it.
Is my image uploaded?
No. All processing happens on your device.
Which factor should I choose for printing?
Work backwards from the print size: multiply the size in inches by 300 to get the pixels a sharp print needs, then pick the smallest factor that reaches it. Enlarging further adds file size but no visible quality.