Convert ASCII to Hex
Quickly convert ASCII characters to hexadecimal numbers. 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 Hex
- 1. Type the ASCII text. Enter the characters you want to encode into the input pane. Each character maps to its ASCII code point, written as a two-digit hex byte.
- 2. Adjust the Separator. Use the Separator field to decide how bytes are joined. Spaces make dumps easy to read and diff, while clearing the field yields a compact 4869 style string for identifiers and URLs.
- 3. Copy the byte listing. Once 'Hi' shows as 48 69, copy the output and paste it into your assembler source, EEPROM programmer or protocol note.
When to use Convert ASCII to Hex
Convert ASCII to Hex gives you the numeric bytes for plain ASCII text, character by character. It is the tool for firmware strings, protocol commands and any workflow where a human types text but the machine on the other end wants base-16 codes.
- Embedding strings in assembly or hexfiles. Hand-written bootloader code needs a banner string as db directives. Encode the text here and paste the byte list rather than looking up each character in an ASCII chart.
- Sending AT-style commands as raw bytes. Some modem and BLE modules are scripted through tools that transmit hex. Convert the ASCII command including its trailing characters and queue the bytes for transmission.
- Defining EDID or descriptor strings. USB and display descriptor editors often present string fields as hex bytes. Encode the product name once and fill the field without transcription errors.
- Explaining character codes to students. Seeing that A is 41 and a is 61 makes the ASCII table's structure tangible. Encode sample words live to demonstrate the uppercase and lowercase bit difference.
Examples
Convert
Input
Hi
Output
48 69
About the Convert ASCII to Hex tool
Convert ASCII to Hex does its work locally, right in the browser. Quickly convert ASCII characters to hexadecimal numbers. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Hex Tools collection on EditSafely, a set of 108 small, focused Hex 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 Hex 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.