ASCII to HEX Converter
Convert ASCII text to hexadecimal and decode hex strings back to readable characters in real time. Perfect for debugging payloads, reverse engineering byte streams, and teaching encoding fundamentals.
Supports extended ASCII and Unicode characters; non-ASCII code points are padded automatically.
Formatting
Quick stats
Byte breakdown
The ASCII to HEX converter helps developers, QA teams, and security professionals translate between human-readable strings and hexadecimal byte representations. Customize separators, review byte-level breakdowns, and export results for documentation—all without leaving your browser.
Popular ASCII ⇄ HEX Use Cases
- ✓Inspect payloads and headers
Developers can quickly inspect API payloads, email headers, or log fragments that arrive in hexadecimal to verify integrity and troubleshoot issues.
- ✓Reverse engineer byte streams
Convert hex dumps from network captures or firmware binaries back into ASCII to decode hidden configuration strings and metadata.
- ✓Create training exercises
Educators build cybersecurity and encoding exercises by converting phrases into hex that students must decode during labs.
- ✓Document protocol specs
Technical writers can provide alongside documentation showing sample ASCII content translated into hexadecimal for spec clarity.
- ✓Validate CLI input
Command-line tools often require hex flags—turn human-readable labels into the required hex bytes instantly.
- ✓Check stored secrets
Security engineers confirm whether encoded environment variables or secrets revert cleanly to the expected ASCII values.
Why developers choose this converter
Bidirectional converter
Switch between ASCII → HEX and HEX → ASCII with one click, keeping history intact for quick round-trip checks.
Custom byte separators
Choose spaces, commas, new lines, or no separator when formatting hexadecimal output for your workflow.
Printable character insights
See which bytes map to printable ASCII and which resolve to whitespace or control characters with descriptive labels.
Clipboard friendly
Copy the converted result or byte breakdown with a single click—ideal for documentation, tickets, or code comments.
Quick statistics
Review character count, byte length, unique hex values, and printable token counts at a glance.
Privacy first
All conversions run entirely in your browser—no uploads—making it safe for confidential text and hex data.
Frequently Asked Questions
Does the converter support extended ASCII and Unicode?
Yes. Characters outside the basic ASCII range are encoded using their Unicode code points. Non-printable characters are labeled with friendly descriptions such as Tab or Line feed.
Can I paste hex with 0x prefixes or commas?
The tool accepts hex tokens separated by spaces, commas, new lines, semicolons, or prefixed with 0x. It also handles continuous hex strings by auto chunking them into byte pairs.
What happens with invalid hex characters?
Invalid tokens trigger clear error messages so you can correct the input immediately. The converter ignores no characters silently to prevent debugging mistakes.
Is there a limit to the input length?
The tool is optimized for paragraphs and typical payload snippets. Extremely large dumps may be truncated for performance, but most day-to-day developer tasks are supported.
Do you store any of the data I convert?
No. Everything is processed locally in your browser, so nothing is transmitted or saved on Stilest servers.
How accurate are the conversions?
Conversions rely on JavaScript's String and Unicode APIs, ensuring byte-accurate results for ASCII and extended Unicode characters.