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What’s the difference between a JPG and JPEG file

If you pay close attention to the files on your computer – you may have noticed two different – but similar – file types: JPG and JPEG.

But what’s the difference?

The simple answer is – they’re not different at all!

Other than the file extension – they are byte-for-byte exactly the same.

Both JPG and JPEG files are JPEG standard files.

Why are there two different file extensions for the same file?

This dates back to early versions of Windows – which only supported three-character file extensions.

This was known as the 8.3 filename and limited file names to eight-characters and the extension to three-characters.

For example – 12345678.123

While other operating systems like Linux and Mac OS could support the four-character file extension of JPEG – Windows could not.

Therefore for compatibility the three-digit extension of JPG was used.

If you dig a little deeper – there’s more!

The JPEG image standard has been used with other file extensions:

  • .jpg
  • .jpeg
  • .jpe
  • .jif
  • .jfif
  • .jfi

Now what’s with the JIF, JFIF and JFI files?

JIF, JFIF and JFI files are again the JPEG files – however these have capacity additional metadata.

Are JPEG and JFIF the same thing then?

No – JPEG and JFIF are two different things.

JPEG is the compression algorithm (Joint Photographic Experts Group).

JFIF is the file format (JPEG File Interchange Format).

So how do you convert a JPG to a JPEG?

So now you know JPG and JPEG files are the same thing – you might be left wanting to “convert” the file.

For example – if you have an online form which only accepts JPG files, but you have a JPEG.

Because they’re the same – all you need to do is change the file extension at the end of the file.

In Windows 10, to change the file extension:

  1. Open File Explorer (Windows + E)
  2. Open the ‘View’ ribbon
  3. In the ‘Show/hide’ group – tick ‘File name extensions’
  4. Now the file extension is displayed – locate your file and edit the name
  5. For example, change image.jpeg to image.jpg

What are the dangers of someone knowing your IP Address?

Every device that connects to the internet has an IP (Internet Protocol) address.

They’re needed for devices talk to each other and exchange data.

Your IP address may look like

  • – for IPv4 
  • 2001:4860:4000:4uh5:b2fw:0000:8e5d:6432 – for IPv6

– depending on how modern your equipment is.

TIP: Want to know what you IP Address is – check out What is my IP?

But what are the dangers of someone knowing your IP address – and should you hide it?

Denial of Service attack

If someone knew you IP address – they could perform a Denial of Service attack on your router.

This will flood your connection so that your internet stops working – or at best just slows down to a crawl.

This also affects your ISP (Internet Service Provider) – so fortunately most will have systems to detect and manage Denial of Service attacks in their network.

However, these attacks require resources and run the risk of the attacker getting caught and in trouble with their ISP and the law – so fortunately they’re not often directed at home internet connections.

Discover your location

There are online databases which show the geographic location of IP addresses.

Someone with your IP address could uses these to discover your location.

In most cases, these only show your city and state – but this information could be enough to narrow down your identity – such as the school you go to.

Report your IP address as “bad” to websites and services

Some websites, like AbuseIPDB, list “bad” ip addresses – which have been used for hacking, spam and other abusive activity on the Internet.

Someone with you IP address could report it as “bad” – even without you doing anything wrong.

Do this enough times and you’ll have troubles accessing websites which block “bad” IP addresses.

Report your IP address to law enforcement

Taking things a step further – someone with your IP address could also report it as “bad” to law enforcement.

This is unlikely to be taken seriously without evidence – but it still may attract unwanted attention.

Can I be hacked using my IP address?

No – at least least it’s extremely unlikely.

For this to happen you would have to have an existing vulnerability – such as an unsecured router with a default password or open ports.

Fortunately this is extremely rare. Modern routers are designed with security in mind – for example making you set a password before it can be used. And ISP’s often use a firewall to help protect your connection.

Should I hide my IP address?

Sometimes – depending on what you’re doing.

For example, if you’re doing Internet banking you would NOT want to hide your IP address – as you want to have a “clean” connection to the bank. But if you’re browsing websites you don’t trust – YES you should consider hiding your IP address.

The best way to do this is using a VPN – such as Private Internet Access.

Private Internet Access is a highly trusted VPN service which:

  • hides your IP address
  • gives you access via 46 countries – further hiding your location
  • is the only proven no-log VPN service in the world!

I’ve used Private Internet Access for several years and highly recommend them – they offer extreme value for money with prices from $4.42/month.

Why you can’t use 100% of hard drive capacity

If you look closely you’ll see that hard drives never show their full advertised capacity.

Perhaps you’ve bought a nice new 1 TB hard drive to copy files to – but it only shows 930 GB of available space.

But why can’t you save 1 TB of files on that new 1 TB hard drive and where has the missing space gone? Continue reading “Why you can’t use 100% of hard drive capacity”