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MIME 类型检查器

检查文件的 MIME 类型

在浏览器中运行 · 无需上传

此工具及本页说明目前仍为英文。功能完全相同：一切都在你的浏览器中运行。

Drag & drop files here

or

Any file type, one or many. Only the start of each file is read.

Your files stay on your device. Nothing is uploaded.

  • 任何内容都不会离开你的设备
  • 服务器不限制文件大小
  • 无需注册，无水印
  • 免费

How to check a MIME type

  1. Choose one or more files.
  2. Compare the MIME type detected from the contents with the one expected from the file name and the one reported by your browser.
  3. Fix the extension if they don't match.

Three answers, and why they differ

  • From contents: read from the file's own signature. This is what the file really is.
  • From the file name: what the extension normally means.
  • Reported by your browser: usually based only on the extension and your operating system's settings, and sometimes empty.

Is my file uploaded?

No. Your file is processed locally in your browser and never leaves your device. This site has no upload feature, and its security policy blocks the page from uploading anything.

常见问题

Why does a website reject my file?

Many sites check the real content type. If a file is named .jpg but contains WebP or HEIC data, it can be rejected. Convert it to the expected format.

Is my file uploaded?

No. Only the start of the file is read, in your browser.