图片调整大小
在线调整、压缩和转换图片。支持JPEG、PNG、WebP。调整尺寸、质量和格式——全部在浏览器中处理。
将图片拖放到此处或点击上传
JPEG, PNG, WebP, GIF, BMP
尺寸
质量和格式
px
新大小:
大小减少了
ℹ️ 关于 图片调整大小
The Image Resizer lets you convert between formats instantly, free of charge, with everything running in your browser. Resize, compress and convert images online. Supports JPEG, PNG, WebP. Adjust dimensions, quality and format — all processed in your browser. No account, no upload to a server, no data retention. Drop in your input and get the converted output in seconds. The Image Resizer is designed to preserve as much of the original information as possible while producing a clean, correct output in the target format. It works on desktop and mobile, handles large inputs gracefully, and never adds watermarks to the converted result.
💡 使用场景
💎 专业提示
- Verify the output format meets your needs before sharing — the Image Resizer uses sensible defaults, but some use cases require specific encodings or precision.
- For batch work, process files one by one and save each output to a dedicated folder on your device.
- If your input is unusually large, close other browser tabs first — memory-hungry conversions run faster with more available RAM.
- The Image Resizer never alters your source file. Always keep an untouched backup in case you need to re-convert with different settings.
- Pair the Image Resizer with other converters on this site to build multi-step workflows (e.g., CSV → JSON → formatted output).
❓ 常见问题解答
Yes, 100% free with no ads on the output, no registration, and no hidden limits.
No. The Image Resizer processes your input entirely in the browser — your data never leaves your device.
There is no hard cap, but very large inputs may be slow on low-memory devices. We recommend splitting files over 50 MB.
The Image Resizer preserves as much as possible. When the source and target formats have different capabilities (e.g., one supports richer structure than the other), minor representational differences may occur, but the tool keeps the loss visible and predictable.
Yes. The converted output is yours to use in any personal or commercial context.
Yes, the interface is fully responsive and works on all modern mobile browsers.