Platform media requirements
Every network validates images and video against its own rules. Julexis checks your files as you upload them, so most problems surface while you are still editing — not at publish time. This page is the full reference.
What you can upload
Across the eight networks, JPEG and PNG images and MP4 video are accepted everywhere. GIF, WebP and the more specialised formats are supported per platform — the detail below says which.
- A single post can target several channels at once.
- The strictest channel in your selection sets the effective limit for the whole post.
- Two networks never accept a post without media: Instagram and Pinterest. TikTok needs either a video or an image slideshow.
Good to know
If a file doesn't meet a platform's requirements, Julexis shows a validation error with a red indicator instead of failing at publish time. You can fix the file, remove the incompatible platform, or let Julexis auto-crop and resize where that's possible. See Media and files.
Per-platform limits
| Platform | Max image | Video length | Max video | Text-only |
|---|---|---|---|---|
| 8 MB | up to 15 min | 300 MB | no | |
| 8 MB | up to 240 min | 4 GB | yes | |
| 8 MB | 3 s – 10 min | 5 GB | yes | |
| X (Twitter) | 5 MB | 0.5 – 140 s | 512 MB | yes |
| TikTok | 20 MB | up to 10 min | 4 GB | no |
| Threads | 8 MB | up to 5 min | 1 GB | yes |
| 20 MB | 4 s – 15 min | 1 GB | no | |
| Bluesky | 1 MB | 1 – 60 s | 100 MB | yes |
Bluesky's 1 MB image ceiling is the tightest in the set — if it is in your selection, it decides the image size for the whole post.
Per-platform detail
- Images: 0.8:1 to 1.91:1 aspect ratio, max 8 MB
- Videos: max 300 MB, up to 15 minutes
- Video aspect ratio: 0.01:1 to 10:1 (9:16 recommended)
- Video frame rate: 23–60 FPS
- Text-only posts: not supported — Instagram always requires media
- Formats: JPEG, PNG, GIF (images); MP4, MOV (videos)
- Images: no aspect ratio restrictions, max 8 MB
- Videos: max 4 GB, up to 240 minutes
- Reels: 9:16 aspect ratio, 3–90 seconds, 24–60 FPS
- Text-only posts: supported
- Formats: JPEG, PNG, GIF, WebP
- Images: no aspect ratio restrictions, max 8 MB
- Videos: 75 KB–5 GB, 3 seconds to 10 minutes
- Video aspect ratio: 1:2.4 to 2.4:1
- Video frame rate: 10–60 FPS
- Text-only posts: supported
- Formats: JPEG, PNG, GIF
X (Twitter)
- Images: max 5 MB, no aspect ratio restrictions
- Videos: max 512 MB, 0.5–140 seconds
- Video aspect ratio: 1:3 to 3:1
- Video frame rate: 30–60 FPS recommended
- Text-only posts: supported
- Max media per post: 4 files
- Formats: JPEG, PNG, GIF, WebP
TikTok
- Videos: MP4, WebM, MOV — max 4 GB, up to 10 minutes
- Video dimensions: 360–4096 px
- Video frame rate: 23–60 FPS
- Images: JPEG and WebP only, max 20 MB, 1080p
- Max media per post: 10 files (for slideshows)
- Both videos and image slideshows are supported
Threads
- Images: JPEG, PNG, max 8 MB, 320–1440 px wide
- Image aspect ratio: 0.01:1 to 10:1
- Videos: max 1 GB, up to 5 minutes (300 seconds)
- Video aspect ratio: 0.01:1 to 10:1 (9:16 recommended)
- Video frame rate: 23–60 FPS
- Text-only posts: supported
- Images: max 20 MB, 2:3 aspect ratio recommended
- Image dimensions: 600×900 to 2000×3000 px
- Videos: max 1 GB, 4 seconds to 15 minutes
- Video aspect ratio: 1:2 to 1.91:1
- Text-only posts: not supported — a pin always needs media
- Max media per pin: 1 file
- Formats: JPEG, PNG, GIF, WebP, BMP, TIFF
Bluesky
- Images: max 1 MB per image, max 4 images per post
- Videos: max 100 MB, 1–60 seconds
- Video dimensions: 360–1920 px
- Video frame rate: 10–60 FPS
- Text-only posts: supported
- Daily limit: 50 uploads (photos and videos combined)
- Formats: JPEG, PNG, GIF, WebP
Getting media accepted first time
- For Instagram, use a 4:5 aspect ratio for the best grid display.
- Always compress images to reduce file size while keeping quality.
- Test your content on different devices before publishing.
- Keep backup copies of your original media files.
- For the best results, consider creating platform-specific versions of the same asset.
Watch out
A file that passes validation in Julexis can still be refused by the network at publish time — the platforms apply their own checks on receipt. When that happens the post lands in Failed with the network's own error message attached, so you can fix the file and retry. See Common issues.
Tip
Upload the largest version you have. Downscaling one big file to each network's profile always beats upscaling a small one, and Julexis keeps your original untouched in the library.