File Offsets Finder
Explore any file byte by byte with our free online File Offsets Finder. Upload a file and jump to any byte position using decimal (1024), hex (0x400), or percentage (50%) notation. Each byte is displayed as a hex value, decimal value, and ASCII character, along with a plain-English interpretation explaining what the byte represents - from NUL terminators and control characters to printable text and extended ASCII. The surrounding context table shows 8 bytes before and after your target, making it easy to understand the data structure around any position. The hex dump view shows the raw bytes in traditional offset + hex + ASCII format. All processing stays in your browser - your files are never uploaded to any server. No signup required.
File Offsets Finder
Upload any file to explore its bytes at specific offsets. Enter an offset in decimal, hex (0xNN), or percentage (NN%) format to see the byte value, ASCII interpretation, and surrounding context.
Drop a file here or click to browse
Any file type - up to 1 MB displayed, supports files of any size
Offset Formats
- Decimal: Type a plain number like
1024for byte 1024 - Hex: Type
0x400or$400for offset 1024 - Percentage: Type
50%to jump to the midpoint - Byte value is shown as hex, decimal, and ASCII with full interpretation
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What is the File Offsets Finder and how does it work?
The File Offsets Finder lets you upload any file and explore its raw bytes at specific positions (offsets). You can enter an offset in decimal (1024), hex (0x400), or percentage (50%) format to jump directly to that byte. The tool shows the byte's hex value, decimal value, ASCII character, file position, and a plain-English interpretation. You can also step through bytes one at a time and view surrounding context in a table.
What do the different offset formats mean?
Offsets can be entered in three formats: (1) Decimal: type a plain number like "1024" for byte 1024. (2) Hex: type "0x400" or "$400" - hex is the standard in low-level computing and file format specs. (3) Percentage: type "50%" to jump to the exact midpoint of the file. The tool also provides quick-jump buttons for common positions: start (0), 25%, 50%, 75%, and end (last byte).
How many bytes of a file are loaded?
By default, the tool loads and analyzes the first 1 MB (1,048,576 bytes) of your file. This provides enough data for thorough exploration while keeping performance fast even on mobile devices. Larger files can be uploaded - the tool will read the first 1 MB for analysis and display the total file size so you know the full extent of the file.
What do the byte interpretations mean?
Each byte value (0-255) has a standard ASCII/control interpretation. Our tool categorizes bytes into groups: NUL (0), control characters (1-31, 127), space (32), punctuation (33-47, 58-64, 91-96, 123-126), digits (48-57), uppercase letters (65-90), lowercase letters (97-122), C1 controls (128-159), and extended ASCII/UTF-8 (160-255). This categorization helps you quickly understand what kind of data you are looking at.
How do I navigate through a file byte by byte?
After jumping to an offset, use the "Prev" and "Next" buttons to step through bytes one at a time. The context table below the offset bar shows 8 bytes before and 8 bytes after your current position, with the current byte highlighted. You can also use the hex dump view to see a broader section and click through lines.
Can I search for specific byte patterns?
The File Offsets Finder is designed for navigation by position rather than pattern search. For searching byte patterns (e.g., finding all occurrences of "FF D8 FF" in a file), use our Binary Pattern Finder tool, which provides hex pattern search with wildcards and regular expressions.
What file types are supported?
Any file type is supported - the tool reads raw bytes regardless of format. This includes images (JPEG, PNG, GIF), documents (PDF, DOCX), audio (MP3, WAV), video (MP4, AVI), archives (ZIP, RAR), executables (EXE, ELF), and any other binary or text file. Since all processing is local, there are no format restrictions.
Is my data safe and private?
Absolutely. All file processing happens entirely in your browser using JavaScript. Files are read with the FileReader API, analyzed locally, and discarded when you close or refresh the page. Nothing is uploaded to any server. You can verify this by checking your browser's network tab - no requests are made.