Resize Image

How to resize an image

1. Drop your image or click to choose a file. JPEG, PNG, and WebP are accepted.
2. Enter the new width or height in pixels. Lock the aspect ratio to scale proportionally.
3. Click "Resize" to process the image in your browser.
4. Download the resized image directly.

Common uses

• Resizing photos to specific pixel dimensions for social media platforms, then compress the result to reduce file size further
• Reducing image dimensions to meet upload size limits on websites and forms
• Preparing thumbnails or preview images for web projects, use image crop to control composition before resizing

Technical specification

• Algorithm or formula: Canvas 2D drawImage with the browser's built-in bilinear/bicubic image-smoothing for the scale step, then canvas.toBlob() to encode the output bitmap.
• Browser API or library: HTML Canvas 2D API; HTMLImageElement for decode; Blob API for download.
• Input limits: Image input up to 50 MB and 50 megapixels. Width and height up to 16,384 pixels (canvas max varies by browser).
• Output: JPEG, PNG, or WebP at the user's chosen dimensions, downloaded via Blob URL.
• Known limitations: Upscaling beyond the source resolution causes visible softness. EXIF metadata (including rotation) is stripped during canvas conversion.

Frequently asked questions

Does resizing affect image quality?

Reducing size generally preserves quality well. Enlarging an image beyond its original dimensions will reduce sharpness, the browser interpolates the missing pixels.

Can I resize without changing the aspect ratio?

Yes. Enable the aspect ratio lock, enter either width or height, and the other dimension is calculated automatically.

Is my image uploaded anywhere?

No. Everything runs in your browser using the Canvas API.

What output formats are available?

You can download the resized image as JPEG, PNG, or WebP depending on the tool settings.