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Image resizer

Image tools

Resize images by pixels or percentage, preserve aspect.

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Resize

Quick start

How to resize an image in your browser

Drop an image, set width / height or scale, download the new version. Nothing uploads.

  1. Step 1
    Drop image

    Drag a PNG, JPG or WebP into the zone or click to pick.

  2. Step 2
    Set target

    Switch between Dimensions (exact width/height) or Scale (a multiplier). Lock aspect ratio to preserve proportions.

  3. Step 3
    Resize + download

    Click Resize to run, then Download the result. PNG stays lossless; JPEG / WebP have a quality slider.

In-depth guide

Image resizer — change dimensions in your browser

Downsize a photo for the web, scale up an icon, or resample to exact dimensions. Aspect-ratio lock keeps proportions intact; PNG output stays lossless, JPEG / WebP let you trade quality for size.

Two ways to specify size

  • Dimensions — type a width and/or height in pixels. Lock the aspect ratio to keep proportions, or untick to stretch.
  • Scale — give a multiplier. 0.5 halves both dimensions, 2 doubles them.

Use dimensions when you have an exact target (e.g. 1200×630 for OG images); use scale when you want a relative reduction (e.g. 50% for a thumbnail).

Common web sizes

UseRecommended size
OG / Twitter card1200 × 630
Hero / banner1920 × 1080
Article body800-1200 wide
Avatar200 × 200 to 512 × 512
Favicon source512 × 512 (then export smaller)

Tips

  • Resize before compressing — fewer pixels means less data even before lossy compression.
  • Use 2× for Retina — if you display an image at 600px wide on a Retina screen, export at 1200px. Add srcset for multi-resolution.
  • Don't upscale if you can avoid it — going from 200 to 800 adds blur, not detail.
  • PNG for graphics, JPEG for photos — saves significant size for the right content type.

Frequently asked questions

Does this tool upload my image anywhere?

No. Resizing happens in a hidden canvas in your browser. The download is a local Blob URL.

Does aspect ratio stay locked by default?

Yes — when 'Lock aspect ratio' is on, changing width recomputes height (and vice versa) to preserve the original proportions. Untick to stretch.

What resampling does it use?

Browser canvas with imageSmoothingQuality='high'. Quality varies by browser — Chrome and Safari use bicubic-ish; Firefox is similar. For pixel-art, untick smoothing in a real editor — this tool always smooths.

Can I upscale?

Yes — set a width or scale larger than the original. The result will be blurrier than the source; canvas doesn't have an AI upscaler built in.

What about EXIF metadata?

Re-encoding via canvas drops all metadata. If you need to preserve EXIF orientation, rotate before resizing in a real editor.

Why does my JPEG look slightly different colours?

JPEG re-encoding is lossy and discards the ICC profile. For colour-critical work, choose PNG output to stay lossless.

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