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FILEDOCTOR REPAIR PLAYBOOK / 5 STEPS

BMP Picture Will Not Open: Diagnose Headers and Pixel Data

Check BMP file length, pixel offset and DIB headers before trying conversions.

Work from a copy. Some damage cannot be recovered. Avoid uploading private files to untrusted services or overwriting the only original.

Step-by-step troubleshooting

  1. 01

    Keep the source image

    Save the exact BMP and do not repeatedly overwrite it during conversions.

  2. 02

    Confirm the signature

    Use File Type Detector to see whether the file actually starts with the BMP signature.

  3. 03

    Check the DIB header

    Run BMP Header Validator to identify implausible dimensions or pixel offsets.

  4. 04

    Try another trusted viewer

    An alternative editor may support unusual valid BMP compression or DIB variants.

  5. 05

    Re-export from the source

    If the pixel array is missing, use the original editing project or backup rather than guess pixels.

NEXT ACTION / TEST YOUR FILE

Check before repairing.

Run an appropriate browser-side check to understand what can be verified about the file.

Open BMP Image Header Validator ↗

What if the file is still broken?

Structural checks can identify evidence of truncation, checksum errors or a format mismatch, but a successful check does not prove every application can decode the file. If critical data is missing, restore from backup, request a new copy or use a reputable specialist with permission to access the content.

For important or sensitive files, retain a copy of the original and document each recovery attempt. Avoid tools that promise guaranteed reconstruction of missing bytes.

For a practical recovery order that minimizes accidental damage, see our safe file recovery checklist. For format-specific limits, see supported formats and test scope.

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