File size and format limits

File upload failures are almost always caused by one of three things: a format Flamel does not accept, a file that exceeds Flamel's upload limit, or a file that passes Flamel's limit but exceeds the destination platform's limit at publish time.

Flamel upload limits

Type	Accepted formats	Max size
Images	JPG, PNG, WebP, GIF	30 MB
Videos	MP4, MOV	4 GB

Platform limits at publish time

Flamel warns you when a file exceeds a platform's limit before it attempts to publish.

Platform	Image	Video
Instagram feed	Within Flamel's image limit	60 min
Instagram Reels	n/a	90 sec
Stories (Facebook or Instagram)	Within Flamel's image limit	60 sec each
Facebook	Within Flamel's image limit	240 min
LinkedIn	Within Flamel's image limit	10 min
TikTok	n/a	10 min, max 287.6 MB (mobile) or 500 MB (web)
X (Twitter)	Within Flamel's image limit	2 min 20 sec standard, 60 min Premium

Troubleshoot a failed upload

Symptom	What to try
Unsupported format error	Convert to JPG, PNG, or MP4 using a desktop tool
File too large	Compress or resize before uploading
Progress bar stuck	Refresh, then try uploading a smaller batch (5 to 10 files)
Colors look wrong or distorted	Save as a standard RGB color profile, not CMYK

Compress images

Most photo editors let you adjust JPG quality — setting it to 80% typically reduces file size by 70%+ with no visible quality loss.

Free tools:

• ImageOptim (Mac desktop)
• Squoosh (web, squoosh.app)
• Sharp (command line)

Compress video

Handbrake (free desktop) or FFmpeg (command line) can dramatically reduce video file size. H.264 encoding at an 8 Mbps target bitrate handles most social content while staying well under platform limits.

Recommended dimensions

Use these sizes for the best results across platforms:

Asset	Recommended size
Square image	1080x1080
Vertical video, Stories, Reels	1080x1920 (9:16)
Horizontal video	1920x1080 (16:9)
Link share image	1200x630