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Photos and video

Upload once, at full quality. Postatron prepares a copy for each platform that fits its rules.

Uploadup to 5 GB
Checktype and size
Preparea copy per platform
Publisheach one fits

Formats

Kind	Formats
Photos	JPEG, PNG, GIF, WebP, HEIC
Videos	MP4, MOV, M4V, 3GP, WebM

A single file can be up to 5 GB; large files upload in parts.

How files are prepared

A photo larger than a platform takes is shrunk for that platform only. Bluesky, for example, takes photos up to 1 MB, while LinkedIn takes 10 MB.
A format a platform does not take is converted: a WebP becomes a JPEG for X and Pinterest, and a PNG becomes a JPEG for TikTok.
A video over a platform's size limit is re-encoded for it. The post waits while that happens and then goes out on its own.
Your original file is never changed, so each platform gets the best copy it can take.

Alt text

Add a description to each photo for people using screen readers. It goes out with the photo to X, Instagram, LinkedIn, Threads and Bluesky.

From the API and AI assistants

Send a public link to a file, up to 300 MB, and Postatron fetches it. For a file on your own device, ask for an upload link: your assistant hands you a page to drop the file on, and the upload goes straight to storage at any size up to 5 GB.

POST https://api.postatron.com/v1/posts
{ "content": "Behind the scenes", "platforms": ["instagram"],
  "media_urls": ["https://example.com/photo.jpg"] }