SkyyCastFree Tools for Publishing, Media & Marketing
Practical browser-based tools to validate content, optimize media, and build cleaner campaigns before you publish.
- Free to use
- Runs in your browser
- No account required
- Nothing uploaded
Bluesky publishing
Three checkers for the steps before you post: your images, your text and your video.
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Image Size Checker
Check the size, dimensions and format of up to four images, and prepare oversized ones for Bluesky.
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Post Validator
Check a post's length against Bluesky's official limits, along with its images and alt text, before you publish.
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Video Upload Checker
Check a video's file size, duration and format against Bluesky's limits before you upload it.
Image & media
A general-purpose image optimizer for any photo, screenshot or graphic, not just Bluesky posts.
Marketing & tracking
Build clean campaign links and catch tracking mistakes before you publish.
How these tools work
Every tool runs in your browser. Your images, text and videos are checked on your own device and are not uploaded to SkyyCast. Each tool states the limits it checks, links to Bluesky's official source for them, and shows the date they were last verified.
SkyyCast is an independent third-party service. It is not affiliated with, endorsed by or sponsored by Bluesky.
Ready to schedule the post too?
SkyyCast helps you plan and schedule Bluesky content. The Free plan includes 15 published posts a month.
See how it works