The Blob
interface's size
property returns the size of the Blob
or File
in bytes.
The number of bytes of data contained within the Blob
(or Blob
-based object, such as a File
).
This example uses an <input>
element of type file
to ask the user for a group of files, then iterates over those files outputting their names and lengths in bytes.
html
<input type="file" id="input" multiple /> <output id="output">Choose files…</output>
js
const input = document.getElementById("input"); const output = document.getElementById("output"); input.addEventListener("change", (event) => { output.innerText = ""; for (const file of event.target.files) { output.innerText += `${file.name} has a size of ${file.size} bytes.\n`; } });
Specification |
---|
File API # dfn-size |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
size |
5 | 12 | 4 | 10 | 11 | 6 | 4.4 | 18 | 4 | 11 | 6 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Blob/size