Online ASCII Encoder & Decoder

Paste or type your text into the Input editor. Make sure Encode mode is selected in the toolbar. The tool converts each character to its ASCII code and shows the result in the Output editor.

Use Copy Output or Save Output to export the ASCII codes. ASCII encoding is commonly used to understand how characters map to numeric codes in computer systems.

Paste a list of ASCII codes into the Input area. You can separate codes with spaces, commas, or new lines. Select Decode mode. The decoded text appears in the Output editor as long as the codes are valid.

If the input contains invalid values, the status bar will show an error message so you can correct them. This is useful for inspecting character codes in logs or debugging data.

Click the Open File icon to load a text file from your device. The tool reads the file locally and converts its characters to ASCII codes or decodes ASCII codes back to text without uploading anything. You can save the result to a new file using the Save Output button.

This feature is particularly useful for processing legacy text files, examining character-by-character encoding, or converting between text and numeric representations.

• Learning computer science: Understand how characters map to ASCII codes and code points at the fundamental level.
• Inspecting legacy systems: Debug and analyze text data in older systems that use ASCII encoding.
• Converting between formats: Transform human-readable text into numeric character codes for data processing or analysis.
• Teaching encoding fundamentals: Demonstrate character encoding principles and how text is stored in computers.

Related tools: Hex Encoder/Decoder, Binary Encoder/Decoder, and Base64 Encoder/Decoder.

This ASCII encoder and decoder runs entirely in your browser using JavaScript. Your text and files are never uploaded or stored by LeanTul, making it suitable for sensitive logs, configuration files, and internal data.

Note: ASCII encoding is not a form of encryption. It simply maps characters to numeric codes. Anyone can convert ASCII codes back to text, so never rely on ASCII encoding for security or privacy.

Does this ASCII encoder upload my text or files?

No. All ASCII encoding and decoding happens directly in your browser. Nothing is uploaded or stored.

Can I convert text to ASCII codes?

Yes. In Encode mode, the tool converts every character from the Input editor into its ASCII code representation in the Output editor.

Can I convert ASCII codes back to text?

Yes. Switch to Decode mode, paste your ASCII codes into the Input editor, and the corresponding text will appear in the Output as long as the codes are valid.

Does this tool support Unicode characters?

The tool is designed around ASCII character codes but can work with extended characters depending on your browser environment. Non-ASCII characters may be represented by their underlying code points.

Is ASCII encoding a form of encryption?

No. ASCII encoding simply maps characters to numeric codes. It does not provide any security or secrecy.