Image Converter
转换 JPG、PNG、WebP 和 iPhone HEIC。
仅在您的设备上私密处理
使用指南
Image formats store pixels in different ways. JPG is widely accepted and efficient for photographs, PNG preserves transparency and crisp graphic edges, and WebP often combines good quality with a small file. Conversion creates a new file; renaming an extension does not actually change its format.
常见问题
Can I rename .png to .jpg?
No. The bytes remain PNG and a strict portal may reject them. This tool decodes and re-encodes the pixels into the selected real format.
Why does JPG need a background color?
JPG has no transparency channel. Choosing a color prevents transparent edges from becoming black or unpredictable.
Why is HEIC slower the first time?
HEIC needs a specialized local decoder. It is downloaded from this same site only after a genuine HEIC signature is found.
Are converted images uploaded?
No. Files remain in browser memory and the result is produced as a local Blob download.