Image Upscaler – Enlarge Photos 2x, 3x, 4x
Enlarge JPG, PNG, WebP images with sharp Lanczos resampling — free, private, in-browser.
Drop files here
JPG, PNG, WebP, GIF, BMP — up to 5 images, 25 MB each. Everything runs in your browser; nothing is uploaded.
Tip: upscaling adds pixels — it can’t invent detail that wasn’t in the original photo. For best results start from the highest-quality source you have, and prefer 2× over 4× for already-large images.
Upscale images online free (2x, 3x, 4x)
ToolsOfWeb is a free image upscaler that enlarges your photos 2x, 3x, 4x — or any custom size up to 800% — with a true Lanczos-3 resample, the same class of filter professional tools use for high-quality enlarging. Everything runs in your browser: no upload, no watermark, no sign-up, and your files never leave your device.
Upscale up to 5 images at a time, compare before and after with the drag slider, then download individually or as a ZIP. Export to PNG, JPG, or WebP with quality control, and keep transparency when you need it.
How to upscale an image
- Drop up to 5 images (JPG, PNG, WebP, GIF, BMP — 25 MB each).
- Pick 2x, 3x, 4x, or a custom percentage and choose the Lanczos, Smooth, or Pixel-art method.
- Choose the output format (PNG keeps transparency; JPG/WebP have a quality slider).
- Click Upscale, drag the comparison slider to check the result, then download.
Lanczos vs smooth vs pixel-art — which method?
Lanczos (sharpest) reconstructs each new pixel from a 6×6 neighborhood of source pixels. It preserves edge sharpness and fine detail far better than basic stretching, which is why it is the default for photographs. It is slower because of the extra math — a fair trade for quality.
Smooth (fast) uses the browser’s high-quality resample. Fine when you need a quick enlargement and don’t want to wait.
Pixel art uses nearest-neighbor resampling: every pixel becomes a solid block with zero blending. It is the only correct choice for sprites, retro game art, and pixel logos — any smoothing would ruin the look.
Tips for the cleanest enlargements
- Start from the highest-quality source you have — upscaling can’t recover lost detail.
- For print, upscale to the exact pixel size you need rather than the maximum.
- Keep the “enhance details” sharpening on for photos; turn it off for pixel art.
- Export logos and graphics as PNG; export photos as JPG 90% or WebP 85% for small files.
- Need smaller files instead? Try the Image Compressor after upscaling.
FAQs
Does upscaling add real detail to my photo?+
Upscaling adds pixels using smart resampling — it cannot invent detail that was never captured. A Lanczos resample keeps edges sharp and avoids the blur of naive stretching, so the result looks clean, but starting from the highest-quality source you have always gives the best outcome.
Which upscaling method should I choose?+
Lanczos (sharpest) is the best all-round choice for photos — it is the same family of filter professional tools use. Smooth (fast) is fine for quick enlargements. Pixel art mode uses nearest-neighbor resampling, which is the only correct option for sprites and pixel art because it keeps every pixel crisp.
Does this upload my images to a server?+
No. Upscaling runs locally in your browser with the Canvas API. Your files are never uploaded, and there is no watermark or account required.
What is the maximum image size I can upscale?+
Each file can be up to 25 MB, and the output is capped at 12,000px per side to keep your browser stable. For very large sources, prefer 2x over 4x.
Will transparency be preserved?+
Yes, when you export to PNG or WebP. JPG cannot store transparency, so see-through areas are filled with the background color you pick.
Related Tools
Want guides and tips? Visit the ToolsOfWeb blog or go back to the homepage.
Upscaled and need it smaller for the web?
Large upscaled files can be heavy. Run the result through the Image Compressor to shrink the file size without visible quality loss — ideal before uploading to a website or marketplace listing.