File Comparator

Compare two files bit-by-bit to see if they are identical. The tool checks the file content, not the name or date. Your files are never uploaded.

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Drop File 1 or Click to Select

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Drop File 2 or Click to Select

▸How to Compare Two Files

Verifying if two files are identical is a simple, three-step process.

  • ❶
    Select Your Files

    Drag and drop each file into one of the boxes, or click on a box to open the file selector. You must select two files to proceed.

  • ❷
    Start the Comparison

    Once two files are selected, the 'Compare Files' button will become active. Click it to begin the bit-by-bit comparison.

  • ❸
    View the Result

    The tool will instantly tell you if the files are identical or different. For large files, a progress bar will show the status. No data ever leaves your computer.

✦Key Features & Guarantees

  • ◆
    100% Client-Side & Private

    Files are read and compared directly in your browser. They are never uploaded to any server, ensuring complete privacy and security.

  • ◆
    Bit-by-Bit Accuracy

    This isn't a superficial check. The tool reads the entire binary content of both files to ensure they are truly identical, byte for byte.

  • ✦
    Large File Support

    By processing files in chunks, the tool can handle large files (many GBs) without crashing your browser, which is a common issue with other client-side tools.

  • ■
    Any File Type

    It doesn't matter if it's an image, a video, a PDF, or a program executable. The tool compares the raw data, making it universally compatible.

◈Frequently Asked Questions (FAQ)

Yes. The comparison happens entirely within your browser. Your files are not uploaded to any server. The code uses standard browser APIs to read file content into memory for comparison. After you close the page, it's gone. You can even disconnect from the internet after the page loads and the tool will still work.

Only the binary content of the files is compared. File names, creation dates, modification dates, and other metadata are completely ignored. If two files have different names but identical content, this tool will report them as 'Identical'.

It's useful for verifying file integrity. For example: confirming that a file you downloaded is not corrupt by comparing it to a trusted copy, ensuring a file was copied correctly to a USB drive, or checking that a backup file is an exact duplicate of the original.

It means the tool reads both files and checks if the first byte of File A is the same as the first byte of File B, then the second byte, and so on, all the way to the end. This is the most thorough way to confirm two files are exact copies, unlike just checking file sizes.