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Introduction2026-02-092026-02-072026-01-242026-01-222026-01-122025-11-152025-09-232025-09-182025-07-282025-07-132025-06-262025-06-012025-05-302025-05-192025-05-172025-05-142025-04-172025-04-142025-03-312025-03-252025-03-012025-02-262025-02-122025-02-062025-01-022024-12-312024-12-302024-12-142024-12-112024-12-102024-12-092024-12-052024-09-302024-08-152024-08-012024-07-132024-06-272024-06-212024-05-222024-04-032023-08-232023-08-212023-07-232022-11-242022-11-192022-03-082021-11-262021-08-272021-01-022020-12-232020-12-09
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2026-02-07

The POST /v1/images endpoint now rejects SVG uploads by default, returning a 400 error. SVG files aren't reliably rendered by most email clients, so this protects you from accidentally sending broken images to subscribers.

If you need to upload SVGs anyway (for instance, if they're only used in your web archive), you can bypass this restriction with the X-Buttondown-Live-Dangerously header:

curl -X POST "https://api.buttondown.com/v1/images" \
  -H "Authorization: Token YOUR_API_KEY" \
  -H "X-Buttondown-Live-Dangerously: true" \
  -F "image=@logo.svg"

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