Answer: Postifys accepts reachable media URLs (with optional
proxyDownload) and still enforces its own temporary-media capacity. Provider caps below are the practical encoding targets - design fan-outs to the strictest destination in the set. Numbers are from official docs where cited; re-check before large encoding jobs.Postifys media handling
- Prefer public HTTPS media URLs; use
proxyDownloadfor Google Drive / Dropbox. - Large files can fail with temporary-media / size errors even when under a provider’s published cap - compress or stagger jobs.
- Async: Postifys acceptance ≠ final public post (especially TikTok inbox and YouTube processing).
Provider media limits (numeric)
| Platform | Max size (typical API/docs) | Duration | Formats / notes | Source |
|---|---|---|---|---|
| Facebook Page video / Reel | Feed/resumable often up to ~1-1.75 GB depending on upload method | Reels API: 3-90 s (story Reel ≤60 s) | MP4 recommended; 9:16 / 1080×1920 for Reels | Meta Reels Publishing; Graph video edges for larger feed uploads |
| Instagram Reel (Graph) | 300 MB (Reels specs in IG media docs) | 3 s-15 min API max; Reels-tab eligibility often shorter / 9:16 | MOV/MP4; H.264/HEVC; AAC | IG User Media |
| YouTube upload | API: 256 GB max file | Up to 12 hours (channel verification required for >15 min in product UI) | video/*; Shorts usually ≤60 s vertical in practice |
videos.insert; YouTube Help |
| Pinterest image Pin | Web image: 20 MB | n/a | JPEG/PNG/WEBP/… - Postifys documents image Pins | Pinterest Pin specs |
| Pinterest video Pin (platform) | Ads/docs often up to 2 GB; organic help lists video length rules | Help center organic video: 4 s-5 min | MP4/M4V/(MOV on mobile); not claimed in Postifys product today | Pinterest Pin specs |
| LinkedIn member video | Organic native: up to 5 GB (Help for Pages) | Help: 3 s-10 min (desktop UI sometimes longer) | MP4 and listed codecs; Postifys = members, not Company Pages | LinkedIn video specs |
| TikTok Content Posting API | 4 GB | API init max 10 min (creator account may trim lower) | MP4/MOV/WebM; H.264 recommended; 23-60 FPS; 360-4096 px | TikTok media transfer guide |
Postifys honesty: TikTok path is creator inbox unless Direct Post is separately approved. Pinterest video Pins and LinkedIn Company Pages are not claimed. Always match the Postifys account type in the compatibility matrix.
Fan-out encoding rule
- Pick destinations first.
- Encode to the strictest size/duration/aspect among them (often Instagram Reel or Facebook Reel for short vertical).
- If one network needs a different aspect, branch a second encode - do not stretch silently.
- Keep YouTube titles non-empty; keep TikTok completion steps explicit for inbox mode.
Related: compatibility matrix · temporary-media errors · unsupported formats · media docs · six-platform fan-out