Binary Structure Parser
Upload any binary file and define a structure template with field types (uint8, uint16, uint32, uint64, int8 through int64, float32, float64, string, hex, bytes, and nested struct) at specific byte offsets. The Binary Structure Parser reads each field, interprets the bytes according to type and endianness, and displays the parsed values alongside raw hex. Includes 10 pre-built templates for BMP, PNG, JPEG, GIF, ELF64, WAV, ZIP, PDF, and WebP file headers - all processing runs locally in your browser, no uploads, no signup, completely free.
Upload any binary file and define a structure template with field types (uint8, uint32, float32, string, hex, and more) at specific byte offsets. The parser reads each field, interprets the bytes according to the type and endianness, and displays the parsed values alongside raw hex. Includes 10 pre-built templates for common file format headers - all processing runs locally in your browser.
Drop a binary file here or click to browse
Supports files up to 256 MB
Why Use Our Binary Structure Parser?
Pre-Built Templates for Common Formats
Jump-start your analysis with 10+ pre-built templates for BMP, PNG, JPEG, GIF, ELF, WAV, ZIP, PDF, and WebP file headers. Each template has pre-defined fields with accurate offsets, types, and descriptions - just upload a file and parse instantly.
Custom Field Definitions
Create your own structure templates by defining fields with offset, type, name, and length. Supports 14 field types including unsigned/signed integers (8-64 bit), IEEE 754 floats, ASCII strings, hex dumps, raw bytes, and nested sub-structures with configurable endianness per field.
Big-Endian & Little-Endian Support
Every field supports independent endianness configuration - parse mixed-endian structures with ease. The Binary Structure Parser handles both multi-byte integer interpretation and IEEE 754 floating-point decoding in both byte orders, critical for analyzing cross-platform binary formats.
100% Private Browser Processing
Your files never leave your device. All binary parsing - from field extraction to hex dump generation - runs locally using the browser FileReader API and DataView. No server uploads, no data logging, no signup required. Completely free and private.
Common Use Cases for Binary Structure Parser
Reverse Engineering Binary Formats
Use the Binary Structure Parser to reverse-engineer proprietary binary file formats. Define fields based on hex patterns and documentation, then parse actual files to verify your understanding of the format structure. Iterate on your template until every field makes sense.
Forensic File Analysis
Examine the internal structure of suspicious or unknown files by parsing their headers field by field. The Binary Structure Parser reveals hidden metadata, unusual field values, and structural anomalies that could indicate tampering, corruption, or malware.
Game Save & Resource File Inspection
Analyze game save files, resource packs, and custom binary formats used in game development. Parse known header structures to extract metadata, verify integrity, and understand how game assets are stored. Ideal for mod development and game preservation.
Security Research & Malware Analysis
Parse PE, ELF, and Mach-O headers to analyze executable structure during security research. The Binary Structure Parser helps identify unusual header values, malformed fields, and packing signatures used by malware to evade detection.
Embedded Systems & Firmware Analysis
Inspect firmware images, bootloader headers, and embedded system binaries by defining custom structure templates. Parse manufacturer-specific header formats to extract version info, checksums, memory layout, and configuration data from IoT devices.
Learning Binary File Formats
Learn how common file formats like BMP, PNG, JPEG, and ZIP are structured at the binary level. Use the pre-built templates to see exactly how header fields are laid out, understand the role of each byte, and experiment with real files to deepen your understanding.
Understanding Binary Structure Parsing
What is Binary Structure Parsing?
Binary structure parsing is the process of interpreting raw bytes as structured data fields based on a known template or format specification. Every file format - from a simple BMP image to a complex ELF executable - defines its data as a sequence of fields at specific byte offsets. A Binary Structure Parser applies a template with field definitions (name, offset, type, length) to a file buffer and produces human-readable values for each field, making the invisible structure of binary files visible and understandable.
How Our Binary Structure Parser Works
- Upload a file - Select any binary file up to 256 MB. The tool reads the file into memory as an ArrayBuffer using the browser FileReader API. All processing is local - your file never leaves your device.
- Choose or build a template - Pick one of 10 pre-built templates for common formats (BMP, PNG, JPEG, GIF, ELF, WAV, ZIP, PDF, WebP) or create a custom template by adding fields with name, offset, type, endianness, and length. Each field can be independently configured.
- Parse and explore - Click Parse to apply the template to the file buffer. The Binary Structure Parser reads each field at its defined offset, interprets the bytes according to the type (uint32, float32, string, etc.), and displays the parsed value alongside the raw hex and offset.
Supported Field Types & Interpretation
- Unsigned Integers (8-64 bit): uint8, uint16, uint32, uint64 - decoded with configurable endianness using DataView. Perfect for sizes, counts, flags, and offsets.
- Signed Integers (8-64 bit): int8, int16, int32, int64 - two's complement interpretation for negative-capable fields like dimensions and coordinates.
- IEEE 754 Floats: float32 (single) and float64 (double) precision - handles both integer and fractional binary values used in 3D models, audio samples, and scientific data.
- Strings & Hex: Fixed-length ASCII strings for text identifiers (like "RIFF" or "IHDR"), hex dumps for bit-packed or raw bytes, and decimal byte arrays for numeric inspection.
- Nested Structures: Recursive sub-structures with relative offsets - model complex formats like RIFF containers, ZIP entries, or custom hierarchical layouts.
Privacy, Security & Availability
The Binary Structure Parser processes everything locally in your browser using the Web FileReader API and DataView for binary parsing. No files are ever uploaded to any server- all template application, field extraction, and hex dump generation happens on your device. There are no signup requirements, no usage limits, no premium features, and no data logging. The tool is completely free to use for any purpose - reverse engineering, forensics, education, or curiosity. For very large files (>256 MB), use a hex editor or command-line tool instead.
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Frequently Asked Questions About Binary Structure Parser
A Binary Structure Parser is a tool that reads raw binary data from a file and interprets specific bytes as structured fields based on a user-defined template. Instead of viewing a wall of hex values, you define fields by offset, type, and length - and the tool extracts and displays human-readable values like integers, strings, and floating-point numbers. It is essential for reverse engineering, forensics, and learning how file formats work at the binary level.
The Binary Structure Parser includes 10 pre-built templates covering the most common file format headers: BMP File Header (BITMAPFILEHEADER + BITMAPINFOHEADER with 16 fields), PNG Signature & IHDR Chunk, GIF Header & Logical Screen Descriptor, JPEG SOI + APP0 (JFIF), ELF64 Header, WAV RIFF Header, ZIP Local File Header, PDF Header, WebP File Header (VP8L), and a generic PNG Chunk Header template. Each template has accurate offsets, types, endianness, and field descriptions.
The Binary Structure Parser supports 14 field types: uint8, uint16, uint32, uint64 (unsigned integers), int8, int16, int32, int64 (signed integers), float32, float64 (IEEE 754 floating-point), string (fixed-length ASCII), hex (raw hex display), bytes (decimal byte values), and struct (nested sub-structures with child fields). Every field type supports per-field endianness configuration for mixed-endian format analysis.
Click the "Add Field" button to add a new field definition. For each field, enter a name, set the byte offset (in decimal or hex using 0x prefix), choose the field type from the dropdown, specify the length (required for string, hex, and bytes types), and select the endianness. For nested structures, add child fields after selecting the "struct" type. You can remove fields with the delete button or clear all fields to start fresh.
Yes - the offset input accepts both decimal numbers and hexadecimal values (using the 0x prefix). For example, you can enter "0x1A" for offset 26, or just "26" directly. The displayed offset in the results always shows both the hex and decimal format for clarity.
The Binary Structure Parser processes files up to 256 MB. Since most binary format headers are only a few dozen to a few hundred bytes, this limit is more than sufficient for header analysis. For larger files or full-file parsing, consider using a command-line hex editor or a dedicated binary analysis tool.
If a field's offset falls beyond the end of the uploaded file, the Binary Structure Parser marks that field as "out of bounds" and continues parsing the remaining fields. This is useful for checking whether a file is truncated or for verifying that expected header fields are actually present.
Yes - every field has its own endianness setting (little-endian or big-endian). This is essential for formats like ELF (which uses little-endian for most fields but big-endian for some), TIFF (which switches endianness based on the II/MM magic bytes), or mixed-endian network protocol headers. Simply set the endianness per field in your template.
Yes - 100% free, forever. No signup, no account, no premium tier, no usage limits, and no ads. Parse as many files and templates as you need. All processing is done locally in your browser with zero server uploads, ensuring complete privacy for your binary analysis work.