The Blob interface's size property returns the size of the Blob or File in bytes.
Blob.size
Value
The number of bytes of data contained within the Blob (or Blob-based object, such as a File).
Examples
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>
JavaScript
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`; } });
Result
Specifications
| Specification |
|---|
| File API # dfn-size |
Browser compatibility
| 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
|
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Blob/size
