View and edit binary files in hexadecimal format. Browse file contents, edit bytes, and save changes with real-time hex and ASCII display.
Features
- View binary files in hexadecimal and ASCII format.: Synchronized hex/ASCII panes with offsets make raw bytes readable and easy to inspect.
- Edit individual bytes with real-time preview.: Type-safe hex input with instant diff highlights and undo/redo safeguards.
- Navigate large files with virtualized scrolling.: Virtualized rendering keeps navigation smooth even for multi‑MB/GB files.
- Save modified files with all changes preserved.: Export edited bytes without metadata loss; checksum integrity optionally retained.
Usage Guide
- Step 1: Click 'Open File' to select a binary file from your computer.
- Step 2: Browse the file content in hexadecimal and ASCII format, click on any byte to edit.
- Step 3: Make your changes and click 'Save File' to download the modified file.
Technical Details
What is a Hex Editor
A hex editor is a specialized tool for viewing and editing binary files in hexadecimal format, displaying raw byte data as human-readable hexadecimal values. Each byte is represented by two hexadecimal characters (00-FF), with an ASCII column showing printable characters. Hex editors are essential for reverse engineering, debugging, file format analysis, and low-level data manipulation. They provide direct access to file contents at the byte level, enabling precise control over binary data.
Binary Data Processing and Display
Hex editors process binary data by reading file bytes, converting them to hexadecimal representation, and displaying them in a structured format with address offsets, hex values, and ASCII characters. The process includes file loading, memory mapping for large files, real-time hex-to-ASCII conversion, and efficient data rendering. Advanced features include virtualized scrolling for large files, search functionality, pattern recognition, and support for different endianness and data types.
Byte Editing and File Modification
Hex editors enable direct byte-level editing by allowing users to modify hexadecimal values, which are then converted back to binary data and written to the file. The editing process includes input validation for hex values, real-time preview of changes, undo/redo functionality, and change tracking. Advanced features include bulk editing, pattern replacement, checksum calculation, and backup creation.
Frequently Asked Questions
- Does this tool upload files?
- No. All parsing and editing happen locally in your browser.
- How do I locate a signature in a file?
- Use hex view and the search box to find magic numbers (e.g., 50 4B 03 04 for ZIP).
- How to avoid corrupting files?
- Edit small regions, keep backups, and verify checksums after saving changes.
- Can I switch endianness?
- Endianness impacts interpretation, not raw bytes. Toggle view helpers; bytes remain unchanged.
- Large files feel slow—what can I do?
- Enable virtualized view, reduce bytes per row, and limit live ASCII rendering when possible.
Related Documentation
- Hexadecimal Number System - Understanding hexadecimal (base-16) number system and representation
- Binary File Formats - Understanding binary file structure and hex representation
- MDN - ArrayBuffer and Binary Data - JavaScript APIs for binary data manipulation and hex conversion
- Hex Dump Format - Standard hex dump format and conventions for displaying binary data
- MDN - Blob API - Working with binary large objects