Image Resizer

调整和裁剪图片大小。

Drop images here or click to upload

JPG, PNG, WebP · up to 50 images · 0/50 selected

Resize & Crop

Change dimensions with aspect ratio lock.

Batch Mode

Resize multiple images at once.

Download

Save resized images instantly.

Client-side

All processing in your browser. No data uploaded.

关于Image Resizer

The Image Resizer lets you change the pixel dimensions of your photos and graphics instantly, right in the browser. Whether you need to scale images down for email attachments, resize thumbnails for a web gallery, or prepare assets to meet a platform's exact dimension requirements, this tool handles it all without any software installation. You can resize by percentage (e.g., 50% to halve the dimensions), by a fixed target width, or by a fixed target height — the aspect ratio is always preserved automatically to prevent distortion. Batch mode lets you apply the same resize settings to up to 50 images at once, saving enormous time compared to doing each file individually. The original file format is preserved (JPEG stays JPEG, PNG stays PNG, WebP stays WebP), and you can download results one by one or as a single ZIP archive. Processing happens entirely on your device, so there are no file size limits imposed by server-side APIs and your images remain completely private.

如何使用Image Resizer

Click the upload area or drag and drop one or more images onto the drop zone — up to 50 files at once.
Choose a resize mode: "Scale %" to resize proportionally, "Max width" to set a target width, or "Max height" to set a target height.
Enter the target value using the slider (for percentage) or the number input (for pixel dimensions).
All images will resize automatically. Review the original and new dimensions shown next to each file.
Click "Download" next to a single image to save it, or "Download all" to export all resized images as a ZIP.
Click "Clear all" to start a new batch when finished.

常见问题

Does resizing preserve the aspect ratio?

Yes. When you set a target width or height, the other dimension is calculated automatically to maintain the original aspect ratio and prevent stretching.

Can I enlarge images as well as shrink them?

Yes. The percentage slider goes up to 200%, and you can enter any pixel value for width or height. Note that enlarging a raster image may cause it to appear blurry.

What image formats are supported?

JPEG, PNG, WebP, GIF, BMP, and most other browser-readable raster formats. The output format matches the original file type.

Are my images sent to a server?

No. All resizing is done locally in your browser using the HTML5 Canvas API. Your images never leave your device.

How do I resize images to specific social media dimensions?

Select "Max width" mode and enter the required width (e.g., 1200 for Twitter, 1080 for Instagram). The height will adjust automatically while keeping the aspect ratio.