Binary Compare Online
Compare two files byte by byte. Find binary differences between any files.
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About Binary Compare Online
Compare two files byte by byte and find binary differences in hex format. Upload any two files to see their sizes, match percentage, and detailed byte-level differences. Free online tool — no signup, 100% private. All processing happens in your browser — nothing is uploaded to any server.
What Is Binary File Comparison?
Use our binary diff online tool for examining two files at the most fundamental level — individual bytes. Unlike text comparison tools that work with lines and characters, a binary compare tool reads the raw byte data of each file and identifies every single position where the two files differ. This is essential for verifying file integrity, detecting corruption, and comparing compiled executables or media files that cannot be meaningfully compared as text.
How Does the Hex View Work?
When you upload two files to our binary compare tool, the application reads each file into memory as an ArrayBuffer and converts the data to a Uint8Array for byte-level access. Each byte is then displayed in hexadecimal (base-16) notation, which represents every byte as a two-character code ranging from 00 to FF. The hex view presents differences in a structured table showing the offset (memory address), the hex value from File 1, the hex value from File 2, and the decimal equivalents. Bytes that differ between the two files are highlighted in red, making it immediately obvious where changes have occurred.
Understanding Checksums and File Integrity
Checksums are mathematical fingerprints generated from file data using algorithms like MD5, SHA-1, or SHA-256. When two files have identical checksums, they are byte-for-byte identical. Our binary compare tool goes beyond simple checksum comparison by showing you exactly where differences exist. This is invaluable when you need to know not just that files differ, but precisely which bytes changed. Common use cases include verifying downloaded files against published checksums, comparing firmware versions, validating backup integrity, and forensic analysis of modified files.
Use Cases for Binary Comparison
Developers frequently use binary comparison when working with compiled code, ROM files, firmware images, or encrypted data. System administrators rely on binary diff tools to verify that backup copies are identical to source files. Security researchers use byte-level comparison to analyze malware variants or detect unauthorized modifications to system files. Game modders compare ROM dumps to identify specific data structures. Quality assurance teams compare build artifacts across different compilation environments to ensure reproducibility.
Privacy and Security
Our binary compare tool processes everything locally in your browser using JavaScript ArrayBuffer and Uint8Array APIs. Your files never leave your computer — there is no upload to any server. This makes it safe to compare sensitive files including proprietary software, confidential documents, or private media. The comparison happens instantly in memory and results are displayed directly in your browser without any network requests.
Technical Limitations
The tool displays up to 100 byte differences to maintain browser performance. For very large files, the comparison still calculates the total number of differing bytes and the overall match percentage, but only the first 100 differences are shown in the hex table. File size is limited by available browser memory, but modern browsers can typically handle files up to several hundred megabytes.
Frequently Asked Questions
What types of files can I compare with the binary compare tool?
You can compare any two files regardless of type — executables (.exe, .bin), images (.png, .jpg), documents (.pdf, .docx), archives (.zip, .tar), firmware files, ROM dumps, or any other file format. The tool reads raw bytes, so file type does not matter. It works equally well with text files, though for text you may prefer a dedicated text diff tool that shows line-level changes.
How does hex view differ from a regular text diff?
A regular text diff compares files line by line as readable text, ignoring the underlying byte representation. Hex view shows every byte as a two-digit hexadecimal code (00–FF), revealing differences invisible in text mode — such as encoding changes, null bytes, binary headers, or non-printable characters. Hex view is essential for comparing compiled binaries, images, and encrypted files where text-based comparison is meaningless.
Can I use this tool to verify file checksums?
While this tool does not compute checksums directly, it performs a more thorough analysis by comparing files byte by byte and showing the exact match percentage. If two files show 100% match with zero different bytes, they are identical — equivalent to having matching checksums. For explicit checksum computation (MD5, SHA-256), you would use a dedicated checksum tool, but our binary compare gives you deeper insight into where differences actually exist.
Is there a file size limit for binary comparison?
There is no hard-coded file size limit. The tool runs entirely in your browser, so the maximum file size depends on your device's available memory. Most modern computers can handle files up to 500 MB or more without issues. For very large files (over 1 GB), you may experience slower processing or memory constraints depending on your browser and system resources.
Are my files uploaded to any server during comparison?
No. All processing happens 100% locally in your browser using JavaScript. Your files are read into memory using the FileReader API and compared entirely on your device. No data is transmitted over the network, making this tool completely safe for comparing confidential, proprietary, or sensitive files. You can verify this by disconnecting from the internet — the tool will still work perfectly.