The direct Setup and Portable files for Smart GIF Optimizer on GitHub are distributed without a code signature. Because Windows cannot establish publisher reputation for them, Windows protected your PC may appear on first launch.
For a typical installation, we recommend the official Microsoft Store version. It provides a signed package through the Store installation flow, so you do not need to open an unsigned executable downloaded by your browser. The exact screen may vary with your Windows policy and environment.
A SmartScreen warning alone does not mean that a file is malware. Conversely, the absence of a warning does not guarantee that a file is safe. Always verify both the source and the file hash.
Verification steps before running the file
- If the Microsoft Store version is available, consider the Store installation before a direct executable.
- If you choose a direct download, confirm that it came from the GitHub Release linked by the official Smart GIF Optimizer page.
- Confirm that the file name matches the Setup or Portable entry in the direct-download area.
- Compare the SHA-256 value.
- Review the VirusTotal report linked for that exact file.
If every item matches and you decide to continue, select More info on the SmartScreen screen and verify the displayed file name and publisher details again. Depending on Windows policy or security settings, the Run anyway option may not be available.
What is SHA-256?
SHA-256 is a value that lets you compare a downloaded file with the file published in the release. Any change to the file changes the value. If it does not match the value on this website, do not run the file. Delete it and download it again from the official page.
For screen-by-screen details and the PowerShell verification command, see the Windows security section of the Smart GIF Optimizer guide.