Batch Image Resizer
Resize, fit, rename, and export a batch of browser-decodable images as one ZIP.
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浏览器内运行这个工具能做什么
Resize multiple images to a shared width and height, choose contain or cover behavior, set output format and quality, and download predictable renamed files in a ZIP archive.
The preview reports original and output dimensions; cover mode crops around the center while contain mode adds a background when aspect ratios differ.
这个工具可以完成什么
Contain each source on a white square and export numbered WebP files.
依赖结果前需要检查什么
- Animated images are flattened to a single decoded frame.
- Very large batches can exceed browser memory; split the batch and retry failed files.
如何使用
- 1
Choose or drop one or more PNG, JPEG, or WebP images.
- 2
Set target dimensions, contain or cover fit, output format, quality, and filename prefix.
- 3
Process the queue and review per-file dimensions and errors.
- 4
Download successful outputs together as a ZIP.
使用场景
Export every item image to the same box and naming pattern.
Constrain large screenshots before committing or publishing them.
常见问题
What is the difference between contain and cover?
Contain keeps the whole image and may add background space. Cover fills the target box and crops overflow around the center.
What happens to transparency in JPEG?
JPEG has no alpha channel, so transparent areas are composited onto the selected background color.
Are filenames preserved?
The workspace generates a numbered prefix plus the original base name so ZIP entries remain unique and ordered.
下一步常用工具
如果还需要校验、转换或复用结果，可以继续打开相近的浏览器本地工具。