Learn the Ultimate Javascript Hack: Converting Local URL to Base64 with Awesome Code Examples

Table of content

  1. Introduction
  2. Understanding Local URL and Base64
  3. Benefits of Converting Local URL to Base64
  4. Steps to Convert Local URL to Base64
  5. Example 1: Convert Local Image URL to Base64
  6. Example 2: Convert Local Audio URL to Base64
  7. Example 3: Convert Local Video URL to Base64
  8. Conclusion


Hey, you tech-savvy folks! Today, I want to walk you through an incredibly nifty Javascript hack that I stumbled upon recently: converting a local URL to Base64. I know, I know – it might not sound like the most exciting thing in the world, but trust me – once you see how amazing it can be, you'll be just as pumped as I am!

First things first, let's talk about what exactly Base64 is. Essentially, it's a way of encoding binary data (like images) into ASCII text that can be easily transmitted over the internet. So, by converting a local URL to Base64, we're essentially turning a file path (like file:///Users/JohnDoe/Documents/Pictures/myPicture.jpeg) into something that can be sent to a web server and displayed on a webpage. Pretty cool, right?

Now, you might be thinking, "Okay, that sounds great, but how the heck do I actually do it?" Don't worry – I've got you covered. In the next few paragraphs, I'm going to walk you through the steps of converting a local URL to Base64 using nothing but Javascript. Sounds intimidating, but I promise it's not as hard as it sounds!

Understanding Local URL and Base64

Have you ever wondered how to take a local URL and turn it into Base64 code? It might not be something you need to do every day, but knowing how to do it is a nifty trick to have up your sleeve!

Before we jump into the code, let's first understand what local URLs and Base64 are. A local URL is simply a reference to a file on your computer. For example, if you have a photo saved in your "Pictures" folder, the URL might look like "file:///Users/username/Pictures/photo.jpg".

Now, Base64 is a way to convert data into a format that can be easily transmitted over the internet. It's like a secret code that only those who know how to decode it can read. Simply put, Base64 is a string of characters that represents binary data.

So, how amazing would it be if we could convert a local URL into Base64? Well, it's actually not too difficult if you know the right code! Stay tuned for some awesome code examples that will take your tech skills to the next level.

Benefits of Converting Local URL to Base64

Let me tell you, converting local URLs to Base64 is a nifty little hack that can save you a lot of time and headaches. Why, you ask? Well, first of all, converting URLs to Base64 allows you to use them as data in your HTML, CSS, or JavaScript files. This means you don't have to worry about broken links or missing files, because all the data is stored right there in the code.

Another benefit is that Base64-encoded URLs are more secure than traditional URLs. Since the data is essentially turned into a string of characters, it's much more difficult for hackers to intercept and decode the data. So, not only are you saving yourself time and headaches, but you're also adding an extra layer of security to your projects.

Finally, let's not forget about the sheer cool factor of being able to convert URLs to Base64 with just a few lines of code. Imagine impressing your colleagues with your newfound knowledge or surprising yourself with how amazing it feels to create something so technical and useful. Trust me, once you start using this hack, you won't be able to imagine working without it.

Steps to Convert Local URL to Base64

Alright folks, let's talk about how to convert a local URL to Base64 in just a few steps. Trust me, this hack is nifty and can come in handy when you're working with images or other media files in your code. Plus, it's super easy to do!

First things first, open up your Mac Terminal. It's time to get our hands dirty with some code! Type in the following command:

echo -n 'file:///path/to/your/local/file.jpg' | base64

Make sure to replace "path/to/your/local/file.jpg" with the actual file path of your image or media file. This command basically tells your computer to encode the file path in Base64 format.

Now, hit enter and you should see a long string of characters appear. That's the Base64 code for your local URL!

If you want to get even fancier, you can create an Automator app that will do this for you with just a few clicks. Here's how:

  1. Open Automator and create a new workflow.
  2. Choose "Run Shell Script" from the list of actions.
  3. Type in the same code as before:
echo -n 'file:///path/to/your/local/file.jpg' | base64
  1. Save the workflow as an application.
  2. Whenever you need to convert a local URL to Base64, simply drag the file into the Automator app and voila!

How amazingd it be to have your own little app that does all the work for you? Trust me, it's a game changer. Happy coding!

Example 1: Convert Local Image URL to Base64

Alright, let's jump right into example #1! Have you ever had the need to convert a local image URL to Base64 format? Maybe you're working on a cool website and want to display an image, but you don't want to slow down your website by constantly loading the image from the server. Well, my friend, I've got just the hack for you!

First things first, let's open up our Mac Terminal. Don't be intimidated, it's just a black box with some text. Type in "base64" and then hit the space bar. Now, drag and drop your local image onto the Terminal window. Boom! Crazy, right? Terminal has converted your local image into Base64 format.

But wait, there's more! We're not done yet. Let's make it even niftier. Create an Automator app by opening Automator, selecting "Application" as the type, and then search for "Run Shell Script." Drag that into the workflow area and then copy and paste the "base64" command we just used into the code area.

Now, save your Automator app and voila! You can drag and drop any image onto your new app and it will automatically convert the local image URL to Base64 format. How amazing is that? Save yourself some time and headache by simplifying your workflow with this cool Javascript hack.

Example 2: Convert Local Audio URL to Base64

Okay, so I showed you how to convert a local image URL to Base64 in Example 1. But what if you're like me and you want to convert a local audio URL to Base64? Well, fear not my friends, because I've got a nifty trick up my sleeve for that too!

First things first, let's find a local audio file on our computer. I'm going to use a file called "song.mp3" that's stored in my Downloads folder.

Now we need to navigate to the location of the file in Mac Terminal. If you're not familiar with Terminal, don't worry, it's super easy. Just open up Spotlight (press Command + Space) and type in "Terminal". It should be the first result that pops up.

Once you have Terminal open, type in "cd" (without the quotes) followed by the path to your Downloads folder. For example, mine looks like this:

cd /Users/Jane/Downloads/

Hit enter and you should now be in the Downloads folder in Terminal. Now it's time to use our old friend, Base64, to convert the audio file to Base64.

Type in the following command:

base64 song.mp3 > song.txt

This command tells Terminal to take the contents of the "song.mp3" file and encode it in Base64, and then save the result in a new file called "song.txt".

Now that we have our Base64 data in a text file, it's easy to copy and paste it wherever we need it. Pretty cool, right?

Just imagine all the possibilities if you combine this trick with the power of Automator. You could create an app that automatically converts local audio files to Base64 with the click of a button. How amazingd it be if you could then use that Base64 data to embed the audio directly into your website or app? The possibilities are endless!

Example 3: Convert Local Video URL to Base64

Alrighty, folks! Time for the Holy Grail of Javascript hacks – converting a local video URL to Base64! Can you imagine how amazing it would be to have video files encoded in Base64 format? Well, wonder no more because I'm about to show you how with an nifty little code example.

First, I'll assume you have a local video file that you want to convert to Base64. If you're on a Mac, you can easily get the file path by right-clicking the file and selecting "Get Info." From there, copy the "Where" field text and paste it in your text editor. Make sure the file path is enclosed in quotes and starts with "file://". Like so:

const filePath = "file:///Users/Username/Movies/my_video.mp4";

Now, let's create a function that will take this file path and convert it to Base64 format. Again, we'll be using the Fetch API and the Blob object to accomplish this. Here's the code:

function videoToBase64(filePath) {
    .then(response => response.blob())
    .then(blob => {
      let reader = new FileReader();
      reader.onload = () => {
        let base64 = reader.result;

As before, we're fetching the file using its path and converting it to a Blob object. Then, we're using FileReader to read the Blob and convert it to Base64 format. Once we have the Base64 string, we're logging it to the console for testing purposes.

To use this function, simply call it with the file path as an argument:


And there you have it, folks! You can now convert local video files to Base64 format using just a few lines of Javascript. Happy hacking!


So there you have it, folks! Converting local URLs to Base64 doesn't have to be a daunting task. With a little bit of Javascript and some nifty coding skills, you can easily create an awesome function that does the job for you. The examples we've covered here are just the tip of the iceberg, and I encourage you to keep experimenting and finding new ways to use this technique in your own projects.

Overall, I think it's pretty amazing how much I've learned about Javascript and web development over the years. It never ceases to amaze me just how much you can accomplish with a little bit of code and some creative thinking. So if you're just starting out or you're a seasoned pro, don't be afraid to dive in and start coding yourself. Who knows what awesome creations you'll come up with?

As a senior DevOps Engineer, I possess extensive experience in cloud-native technologies. With my knowledge of the latest DevOps tools and technologies, I can assist your organization in growing and thriving. I am passionate about learning about modern technologies on a daily basis. My area of expertise includes, but is not limited to, Linux, Solaris, and Windows Servers, as well as Docker, K8s (AKS), Jenkins, Azure DevOps, AWS, Azure, Git, GitHub, Terraform, Ansible, Prometheus, Grafana, and Bash.

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