Supported formats
- Images: JPG, PNG, GIF, WebP
- Videos: MP4, MOV
How media validation works
Each social platform has its own file size, dimension, and duration limits. When you create a post and select multiple platforms, solnk automatically checks your media against every selected platform's requirements before publishing.
If a file doesn't meet a platform's specs, you'll see a warning telling you exactly what's wrong — for example, "Video exceeds X/Twitter's 2 min 20 sec limit" or "File too large for Bluesky (max 1 MB)". You can then fix the issue before the post goes out.
Key things to know
- Images and videos can't be mixed in the same post on most platforms (Threads is the exception)
- Some platforms require media — Instagram, TikTok, Pinterest, and YouTube don't allow text-only posts
- YouTube only accepts video — no image posts
- TikTok Photo Mode requires at least 4 images
Tips
- Use high-resolution images (at least 1080px wide) for best quality
- Vertical video (9:16) works best for Instagram Reels and TikTok
- Horizontal video (16:9) works best for YouTube and X
- When in doubt, just upload your media — solnk will tell you if anything needs to change