Here is the whole idea in three steps.

Step 1: A character is a number

Text encoding starts with a lookup. Every character has a code point, a plain integer. In ASCII, the letter A is 65 and a is 97.

Notice the pattern: uppercase letters start with 010, lowercase with 011. That is not a coincidence, it is how the ASCII table was laid out.

Step 2: The number becomes a byte

A byte is eight bits. So each code point gets written as eight binary digits, padding with leading zeros when needed. This padding is the part people forget.

H is 72, which is 1001000 in raw binary. That is only seven bits. Pad it to a full byte and you get 01001000. Skip the padding and the whole string becomes impossible to split back apart.

Step 3: Bytes become bits

Line the bytes up and you have your binary string. "Hi" is:

01001000 01101001

To read it back, cut it into eight-bit chunks and reverse the lookup.

Doing it in JavaScript

The safe way uses TextEncoder, which gives you real UTF-8 bytes instead of relying on charCodeAt.

const textToBinary = (text) =>
  Array.from(new TextEncoder().encode(text))
    .map((b) => b.toString(2).padStart(8, "0"))
    .join(" ");

const binaryToText = (bin) => {
  const bits = bin.replace(/\s+/g, "");
  const bytes = Uint8Array.from(
    { length: bits.length / 8 },
    (_, i) => parseInt(bits.slice(i * 8, i * 8 + 8), 2)
  );
  return new TextDecoder("utf-8").decode(bytes);
};

textToBinary("Hi");                 // "01001000 01101001"
binaryToText("01001000 01101001");  // "Hi"

The UTF-8 trap

ASCII fits in one byte, so one character equals eight bits. That comfortable assumption breaks the moment you leave plain English.

textToBinary("é"); // "11000011 10101001" (two bytes) textToBinary("🚀"); // four bytes, 32 bits

Accented letters, non-Latin scripts, and emoji all take more than one byte in UTF-8. Any converter built on charCodeAt and a fixed eight-bit assumption will silently corrupt them. TextEncoder and TextDecoder get it right because they speak actual UTF-8.

A quick way to try it

If you just want to convert something without opening a console, I put this exact logic behind a UI: the Text to Binary Translator on Pixellize. It converts both directions as you type, handles full Unicode, and runs entirely in your browser, so nothing you paste leaves your machine.

The takeaway

Text to binary is character to code point, code point to byte, byte to eight bits. Pad every byte so the round trip stays reversible, and let UTF-8 tooling handle anything past plain ASCII. Once that clicks, encoding bugs stop feeling like magic and start looking like a checklist.

What is Pixellize?

Pixellize is more than just an image tool. It’s an all-in-one online platform where you can edit images, compress files, convert formats, and even manage website-related tasks. No software downloads, no subscriptions — just open your browser, upload your file, and get started.

Whether you’re a content creator, marketer, designer, or website owner, Pixellize provides the tools you need to save time and improve efficiency.

Key Features You’ll Love

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Need to resize, crop, rotate, or add filters? Pixellize makes image editing fast and effortless, even without professional software.

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Generate LLMs.txt files for your site with the LLMs.txt Generator, helping search engines understand AI-generated content.

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Keep your website healthy and SEO-friendly by finding broken links with the Websites Broken Link Checker.

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Easily create XML sitemaps using the XML Sitemap Generator to improve search engine indexing and rankings.

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Control which pages search engines can crawl with the Robots.txt Generator. It’s simple, fast, and effective.

8. YouTube Thumbnail Downloader

Download thumbnails from YouTube videos instantly with the YouTube Thumbnail Downloader, perfect for content creators and marketers.

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Need larger image files? Use Increase Image Size in KB to boost file size without compromising quality.

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Convert images into editable text with Image to Text, making it easy to extract content from screenshots, scans, or documents.

Why Pixellize is Perfect for You

• All-in-One Platform: Handle images and website tools without juggling multiple apps.

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Final Thoughts

Whether you’re editing images, optimizing websites, or generating files for SEO, Pixellize is the smart, free solution that makes everything easier. Stop wasting time switching between tools — with Pixellize, everything you need is in one place.

Explore Pixellize today and make managing digital content faster, smarter, and simpler than ever.