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What to Do When a Form Rejects Your Image Format

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

Key points
  • Many forms accept only JPG or PNG
  • Just renaming the extension often doesn't work
  • Convert the format properly with a tool

When uploading an ID photo or document image, you may see "This format is not supported".

Main causes

Fix

  1. Open "Convert Image Format".
  2. Choose the image and pick JPG (photos) or PNG.
  3. Upload the converted image.

Avoid just renaming the extension

Changing .heic to .jpg in the file name leaves the contents as HEIC, and it may not be recognized. Convert it with a tool.

If it still fails

Use "Convert Image Format (JPG, PNG, WebP)" (free)

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