An upload form may accept only JPG, while your screenshot is PNG or an older device has produced a BMP file. The image format converter handles these conversions directly in your browser without uploading your image.

Supported formats

• Input: common image formats such as JPG/JPEG, PNG, GIF, and BMP.
• Output: JPG, PNG, or Original, which keeps the source format and re-encodes the image.

Convert an image in three steps

1. Open Image Format Converter, click Select File, or drag in an image.
2. Select JPG or PNG under Output Format.

PNG 转 JPG

JPG 不支持透明度。该工具会将图像放置到白色背景上并将其压平，因此：

• 透明区域会变成白色。
• 半透明阴影会与白色混合。
• 摄影类 PNG 图像通常会变小。

如果你需要透明徽标，或图像将放置在深色背景上，请保留 PNG。

JPG 转 PNG

PNG 是无损的，但它无法恢复已因 JPG 压缩而丢失的细节。转换为 PNG 通常会增大文件体积。在以下情况下它仍然有用：

• 你计划反复编辑图像，并希望避免重复的 JPEG 压缩。
• 目标平台只接受 PNG。

PNG 输出会移除元数据，并使用 8 位色深以获得广泛的兼容性。

BMP 转 JPG 或 PNG

Which format should you choose?

• Phone photos, landscapes, and portraits：JPG usually offers a practical balance of size and appearance。
• Screenshots, tables, and text-heavy images：PNG keeps edges clear without JPEG artifacts。
• Transparent logos and icons：PNG preserves transparency。
• Forms that accept only JPG：choose JPG to meet the format requirement。

Frequently asked questions

Will conversion change the dimensions?

No. Width and height stay the same.

Will an animated GIF remain animated?

This tool produces static JPG or PNG images. It is not intended to preserve GIF animation.

Why is the PNG larger than the JPG?

Lossless PNG often needs more space for photographic content. If your goal is a smaller file, use Image Compression.

Related tools

• Image Compression
• Image Cropper：export PNG, JPG, or WebP。

Image Tools

Image Tools 页面位于 https://laoxianlaoxian.com/en/img/tools。

该工具支持导出 ICO 图标（export ICO icons）。