How to Convert Bytes to Human-Readable Format in Java?

How to Convert Byte Size into a Human-Readable Format in Java

Determining the human-readable representation of byte size is a common requirement in various computing applications. Java offers a convenient way to accomplish this transformation using the following methods:

SI (1 k = 1,000)

The following method converts byte size to a human-readable format using the International System of Units (SI):

public static String humanReadableByteCountSI(long bytes) {
    if (-1000 < bytes && bytes < 1000) {
        return bytes + " B";
    }
    CharacterIterator ci = new StringCharacterIterator("kMGTPE");
    while (bytes <= -999_950 || bytes >= 999_950) {
        bytes /= 1000;
        ci.next();
    }
    return String.format("%.1f %cB", bytes / 1000.0, ci.current());
}

Binary (1 Ki = 1,024)

For scenarios where binary prefixes are preferred, the following method provides the conversion:

public static String humanReadableByteCountBin(long bytes) {
    long absB = bytes == Long.MIN_VALUE ? Long.MAX_VALUE : Math.abs(bytes);
    if (absB < 1024) {
        return bytes + " B";
    }
    long value = absB;
    CharacterIterator ci = new StringCharacterIterator("KMGTPE");
    for (int i = 40; i >= 0 && absB > 0xfffccccccccccccL >>> i; i -= 10) {
        value >>>= 10;
        ci.next();
    }
    value *= Long.signum(bytes);
    return String.format("%.1f %ciB", value / 1024.0, ci.current());
}

Example Output

The provided code snippets generate the following example output:

SI     BINARY
0:        0 B        0 B
27:       27 B       27 B
999:      999 B      999 B
1000:     1.0 kB     1000 B
1023:     1.0 kB     1023 B
1024:     1.0 kB    1.0 KiB
1728:     1.7 kB    1.7 KiB
110592:   110.6 kB  108.0 KiB
7077888:     7.1 MB    6.8 MiB
452984832:   453.0 MB  432.0 MiB
28991029248:    29.0 GB   27.0 GiB
1855425871872:     1.9 TB    1.7 TiB
9223372036854775807:     9.2 EB    8.0 EiB   (Long.MAX_VALUE)

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