| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Caption length | 2,200 characters | 2,200 characters | Meta docs (opens in a new tab) |
| Hashtags | Up to 30 | Up to 30 | Meta docs (opens in a new tab) |
| Needs a photo or video | Yes | Yes | Meta docs (opens in a new tab) |
| Photo shape | 9:16 to 1.91:1 Looser: a 9:16 carousel posts fine, so we let tall photos through. | 4:5 to 1.91:1 | Meta docs (opens in a new tab) |
| Carousel shape | Every slide is cut to the first slide's shape | Cut to the first photo's shape | Meta docs (opens in a new tab) |
| Photos per post (carousel) | Up to 20 | Up to 20 | Meta docs (opens in a new tab) |
| Photo type | JPEG. sprkly turns most other photos into JPEG for you. | JPEG only | Meta docs (opens in a new tab) |
| Reel length | 3 s to 15 min | 3 s to 15 min | Meta docs (opens in a new tab) |
| Reel shape | Any shape. 9:16 fills the screen. | Almost any shape. 9:16 is best. | Meta docs (opens in a new tab) |
| Video shape | Posts as 9:16 or 3:4 Stricter: we post video as 9:16 or 3:4, and offer to crop other shapes. | 0.01:1 to 10:1 | Meta docs (opens in a new tab) |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Caption length | 63,206 characters | Not in their docs | No link |
| Text-only posts | Yes | Not in their docs | No link |
| Photo shape | Any shape works | Any shape. Facebook resizes it. | Meta docs (opens in a new tab) |
| Photos per post (carousel) | Only the first photo posts for now | Not in their docs | No link |
| Video shape | Posts as 9:16 or 3:4 Stricter: we post video as 9:16 or 3:4, and offer to crop other shapes. | 9:16 to 16:9 | Meta docs (opens in a new tab) |
| Reel shape | 9:16. Other shapes post to your Page feed. | 9:16 | Meta docs (opens in a new tab) |
| Reel length | 3 to 90 s | 3 to 90 s | Meta docs (opens in a new tab) |
| Reel size | At least 540 x 960 | At least 540 x 960 | Meta docs (opens in a new tab) |
| Video type (HEVC) | H.264 and H.265 both post | H.264 and H.265 both work | Meta docs (opens in a new tab) |
| Video file | MP4 or MOV. We warn you about WebM and AVI. | MP4 is best | Meta docs (opens in a new tab) |
| Hashtags | Up to 30 | Not in their docs | No link |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Text length | 500 characters | 500 characters | Meta docs (opens in a new tab) |
| Topic tags | Up to 1 | Up to 1 | Meta docs (opens in a new tab) |
| Photos per post (carousel) | Up to 20 | Up to 20 | Meta docs (opens in a new tab) |
| Photo shape | Almost any shape works | Up to 10:1 | Meta docs (opens in a new tab) |
| Video shape | Posts as 9:16 or 3:4 Stricter: we post video as 9:16 or 3:4, and offer to crop other shapes. | 0.01:1 to 10:1 | Meta docs (opens in a new tab) |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Video caption | 2,200 characters | 2,200 characters | TikTok docs (opens in a new tab) |
| Photo title | 90 characters | 90 characters | TikTok docs (opens in a new tab) |
| Photo caption | 4,000 characters | 4,000 characters | TikTok docs (opens in a new tab) |
| Title needed | Yes Stricter: we ask for a title on every TikTok post. | No | TikTok docs (opens in a new tab) |
| Photos per post (carousel) | Up to 35 | Up to 35 | TikTok docs (opens in a new tab) |
| Photos or video | Photos, or one video. Not both. | Photos and video post in different ways | TikTok docs (opens in a new tab) |
| Photo type | JPEG. sprkly turns most other photos into JPEG for you. Stricter: we send JPEG only. | JPEG or WebP | TikTok docs (opens in a new tab) |
| Photo width | Up to 1080 wide. sprkly resizes for you. | Up to 1080p | TikTok docs (opens in a new tab) |
| Same size photos | sprkly makes every photo in a set the same size | Not in their docs | No link |
| Video length | Up to 10 min | Up to 10 min | TikTok docs (opens in a new tab) |
| Video file | MP4, MOV or WebM | MP4, WebM or MOV | TikTok docs (opens in a new tab) |
| Hashtags | Up to 30 | Not in their docs | No link |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Title | Needed. Up to 100 characters | Up to 100 characters. No < or >. | YouTube docs (opens in a new tab) |
| Description | 5,000 bytes A plain letter is 1 byte. An emoji is 4, so emoji use up more room. | 5,000 bytes | YouTube docs (opens in a new tab) |
| Hashtags | Up to 60 | Over 60 and YouTube ignores them all | YouTube Help (opens in a new tab) |
| Short shape and length | Posts as 9:16 or 3:4, up to 3 min Stricter: we post video as 9:16 or 3:4, and offer to crop other shapes. | Square or taller, up to 3 min | YouTube Help (opens in a new tab) |
| Photo posts | No. Video only. | Video only | YouTube docs (opens in a new tab) |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Text length | 300 characters | 300 letters and emoji | Bluesky spec (JSON) (opens in a new tab) |
| Photos per post (carousel) | Up to 4 | Up to 4 | Bluesky spec (JSON) (opens in a new tab) |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Text length | 280 characters Stricter: we count the whole link. | 280 characters. A link counts as 23. | X docs (opens in a new tab) |
| Photos per post (carousel) | Up to 4 | Up to 4 | X docs (opens in a new tab) |
| Rule | sprkly checks | Platform says | Source |
|---|---|---|---|
| Text length | 3,000 characters | Not in their docs | No link |
| Photos per post (carousel) | Up to 20 | 2 to 20 in one post | LinkedIn docs (opens in a new tab) |
| Rule | sprkly checks | Why |
|---|---|---|
| Photo file size | Up to 50 MB | Our upload limit |
| Video file size | Up to 300 MB on TikTok, YouTube and Facebook | So the video can finish sending in time |
| Video shape | Posts as 9:16 or 3:4. We offer to crop other shapes. | Our own choice |
| HEIC and AVIF photos | Not taken | We cannot change them into JPEG yet |