Convert ASCII to Bytes
Show the decimal UTF-8 byte values of each character. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Convert ASCII to Bytes
- 1. Paste the text to inspect. Enter your text in the input pane. The tool encodes it as UTF-8 and lists the decimal value of every resulting byte, so plain ASCII gives one number per character.
- 2. Set the separator. The Separator option chooses the joining string between byte values. Keep the default space for readability, or switch to a comma and paste the result directly into an array initializer.
- 3. Interpret the numbers. Hi produces 72 105 because those are the UTF-8 byte values. Characters outside ASCII expand to multiple bytes, so an accented letter shows two numbers, which is often exactly the insight you needed.
- 4. Copy the byte list. Copy the sequence into source code, a hex editor session or a byte-level comparison. The bytes-to-ASCII companion tool reverses the process when you want text back.
When to use Convert ASCII to Bytes
Convert ASCII to Bytes reveals the decimal byte values behind a string after UTF-8 encoding. It bridges the gap between text you can read and the numbers programs actually store, which is invaluable when initializing byte arrays, checking encodings or explaining why a string's byte length exceeds its character count.
- Initializing byte arrays in code. Firmware and test code often need a message as a literal like {72, 105}. Convert the string with a comma separator and paste the numbers into your C or Rust source unchanged.
- Spotting multi-byte characters. A field validator says a 10-character name is 12 bytes long. Running the string through here shows which characters expand under UTF-8 and explains the length mismatch instantly.
- Comparing against a memory dump. A debugger shows decimal byte values at some address and you suspect they spell a known string. Encode your candidate text and match the numbers side by side.
- Preparing checksum calculations. Computing a checksum by hand requires the byte values first. List them here, sum or XOR them on paper, and verify the result your code produces for the same input.
Examples
Encode
Input
Hi
Output
72 105
About the Convert ASCII to Bytes tool
Convert ASCII to Bytes does its work locally, right in the browser. Show the decimal UTF-8 byte values of each character. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the ASCII Tools collection on EditSafely, a set of 81 small, focused ASCII utilities that share the same instant, private workspace.
You can shape the output with the Separator setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Convert ASCII to Bytes cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.