The Blob
interface's size
property returns the size of the Blob
or File
in bytes.
Syntax
var sizeInBytes = blob.size
Value
The number of bytes of data contained within the Blob
(or Blob
-based object, such as a File
).
Example
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.
// fileInput is a HTMLInputElement: <input type="file" multiple id="myfileinput"> var fileInput = document.getElementById("myfileinput"); // files is a FileList object (simliar to NodeList) var files = fileInput.files; for (var i = 0; i < files.length; i++) { console.log(files[i].name + " has a size of " + files[i].size + " Bytes"); }
Specifications
Specification | Status | Comment |
---|---|---|
File API The definition of 'Blob.size' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
size | Chrome Full support 5 | Edge Full support 12 | Firefox Full support 4 | IE Full support 10 | Opera Full support 11 | Safari Full support 5.1 | WebView Android No support No | Chrome Android Full support 18 | Firefox Android No support No | Opera Android No support No | Safari iOS No support No | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support