🔎 Image Tools
Image Upscaler — Enlarge 2×, 3× or 4×
Make small images larger without the blocky, blurry look. This upscaler enlarges your photo with high-quality Lanczos resampling and a sharpening pass, right in your browser — nothing is uploaded.
✓ Free forever✓ No upload✓ No signup✓ In your browser
Quick answer: To upscale an image, drop your JPG, PNG, or WebP above, choose 2×, 3×, or 4×, and click Upscale. The image is enlarged with high-quality Lanczos resampling and sharpening right in your browser — nothing is uploaded — and you download the larger image in seconds.
How to Upscale an Image
1
Add Your Image
Drop a JPG, PNG, or WebP onto the tool, or click to browse.
2
Choose Scale
Pick 2×, 3×, or 4×, and your output format.
3
Upscale
The image is enlarged with Lanczos resampling and sharpening, in your browser.
4
Download
Preview the larger image and download it — full quality, no watermark.
Why Use Convertlo?
- 🔒 100% Private — images never leave your browser
- 🆓 Free forever — no account, no watermark, no limits
- 🔎 Up to 4× — enlarge small images for print or display
- ✨ Lanczos + sharpening — crisp results, not blurry scaling
- 🖼️ Keeps transparency — PNG and WebP alpha preserved
- 📱 Works on mobile — any modern browser, any device
Features
100% Private
No server, no upload — images stay on your device.
2×/3×/4×
Enlarge with your choice of scale factor.
Lanczos Quality
Professional resampling with a sharpening pass.
Alpha Safe
Transparency preserved with PNG output.
Live Preview
See the enlarged image before downloading.
Mobile-Ready
Works on iPhone, Android, tablet, and desktop.
Frequently Asked Questions
Yes — completely free, no limits, no watermarks, and no account required. Convertlo runs entirely in your browser, and your images never leave your device.
It enlarges your image using high-quality Lanczos resampling with a sharpening pass — the same professional technique used by photo editors. This produces noticeably cleaner, crisper enlargements than the browser's default scaling, without sending anything to a server.
No. All upscaling happens locally in your browser using the HTML canvas and the Pica resampling library. Your images never leave your device, so there is no file-size limit and nothing is stored anywhere.
No tool can invent real detail that was never captured — this upscaler produces the sharpest possible enlargement from your existing pixels using Lanczos resampling and sharpening. It is ideal for making small images larger for print or display without the blocky, blurry look of naive scaling.
You can enlarge 2×, 3×, or 4×. Very large results are capped to keep your browser responsive — if a combination would produce an extremely large image, reduce the scale factor.
JPG, PNG, and WebP are all supported. Choose PNG output to keep transparency and maximum quality, or JPG for a smaller file.