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How to open .SPNG files on Android

To open .SPNG files on Android, there is typically no standard Android viewer for sealed .SPNG; if it won’t open, transfer it to a desktop with the IRM/unsealer client or use your organization’s approved IRM app if available.

Step-by-step instructions

  1. There is typically no standard Android viewer for sealed .SPNG; if it won’t open, transfer it to a desktop with the IRM/unsealer client or use your organization’s approved IRM app if available.

Common issues

It won’t open in Photos/Preview or an image editor

.SPNG is usually sealed/protected content, not a standard PNG image, so normal image viewers can’t decode it.

  1. Install and use the correct IRM/SealedMedia “unsealer” client used by your organization.
  2. If you expected a normal PNG, ask the sender to provide an unsealed .png (if policy allows).

Access denied / cannot unseal the file

Sealed files enforce permissions. Even with the client installed, you may need to sign in and have rights to view the content.

  1. Sign in to the IRM client with the correct account used for protected documents.
  2. Contact the sender or your administrator to request access rights to the sealed content.

The file type is misidentified or opens in the wrong app

MIME/extension mappings can vary by system configuration; some environments may not recognize .spng automatically.

  1. On Linux, check the detected type using: file --mime-type filename.spng and verify whether it’s image/vnd.sealed.png.
  2. Manually choose the IRM/unsealer application via “Open with” and set it as the default for .spng if needed.

The file seems corrupted or incomplete

If a download or transfer was interrupted, the sealed container may fail integrity checks in the unsealer client.

  1. Re-download or re-copy the file from the original source.
  2. Ask the sender to reseal/resend the content if the original is no longer available.

Security note

.SPNG is designed to enforce access controls; if you receive one unexpectedly, verify the sender and the reason it is sealed before attempting to open it.

Back to .SPNG extension page