Download page update re file size

Most appropriate sub-area of Processing 4?

I'm not sure

Processing version

4.4.7

Operating system

macOS

Bug description

Download page lists Mac download file size as 410MB. Download file size is roughly 429MB

Would you like to work on the issue?

No, I’m just reporting the issue

processing-website/src/hooks/download.js

Lines 38 to 48 in 7dedfc0

    
           function formatBytes(bytes, decimals = 0) { 
        
             if (!+bytes) return '0 Bytes'; 
        
             const k = 1024; 
        
             const dm = decimals < 0 ? 0 : decimals; 
        
             const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']; 
        
             const i = Math.floor(Math.log(bytes) / Math.log(k)); 
        
             return `${parseFloat((bytes / Math.pow(k, i)).toFixed(dm))} ${sizes[i]}`; 
        
           }

The amounts are all correct I suspect its the age old how many bytes in a kilobyte

@kfahn22

Thanks @kfahn22 for reporting this!

As Stef mentioned, this is due to the difference between how file sizes are calculated.

The Processing website calculates using binary units (1 MB = 1,048,576 bytes).
macOS Finder reports sizes using decimal units (1 MB = 1,000,000 bytes).

That’s why the same file shows up as ~410 MB on the site but ~429 MB once downloaded.

Both numbers are correct, they’re just using different definitions of “MB.”

User thomas_r on the macOS community forum gave this explanation for why macOS uses decimal units:

The Mac is reporting file size in megabytes. Windows is reporting file size in mebibytes. The difference is that a megabyte is 1,000,000 bytes, while a mebibyte is 1,048,576 bytes. This change was made in Mac OS X so that reported disk sizes would agree with manufacturer's claimed sizes... most manufacturers claiming a size of 500 GB mean 500,000,000,000 bytes. Mac OS X will also call that number of bytes 500 GB, while Windows will call it 465.7 GB. That confused a lot of people.

Source: https://discussions.apple.com/thread/3440708?answerId=16545377022&sortBy=rank#16545377022

Firefox:

Chrome:

Finder:

While this is a bit annoying, I think the value on the webpage matches where it matters.

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Download page update re file size #644

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	function formatBytes(bytes, decimals = 0) {
	if (!+bytes) return '0 Bytes';

	const k = 1024;
	const dm = decimals < 0 ? 0 : decimals;
	const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

	const i = Math.floor(Math.log(bytes) / Math.log(k));

	return `${parseFloat((bytes / Math.pow(k, i)).toFixed(dm))} ${sizes[i]}`;
	}

Download page update re file size #644

Description

Most appropriate sub-area of Processing 4?

Processing version

Operating system

Bug description

Would you like to work on the issue?

Activity

Stefterv commented on Sep 7, 2025

SableRaf commented on Sep 7, 2025

ulgens commented on Aug 28, 2026

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