X (Twitter) file size limit in 2026: 512 MB max per upload. Codec requirements, compression tips, common upload-failure fixes.
X (Twitter) max file size: 512 MB per single upload.
X (Twitter)'s maximum file size for a single upload in 2026 is 512 MB. Most creators never hit this ceiling — codec efficiency means even a long, high-quality clip rarely exceeds it.
When the limit actually matters: (1) you're uploading uncompressed or ProRes master files instead of delivery-spec H.264. (2) You're using an old codec (H.264 baseline profile) that bloats bitrate without quality gain. (3) You're working in 4K HDR for a platform that only renders 1080p — you're shipping pixels the player never uses.
Codec + format requirements X (Twitter) prefers: audio at AAC-LC, H.264 video (High profile, Level 4.0 or higher), MP4 container. HEVC/H.265 uploads work on most modern platforms but transcode slower on the server side, which can delay the post going live.
Note: Premium+ raises video to 4h and post text to 25k chars.
Common upload failures and fixes: - "File too large" error: re-export at CRF 23 (H.264) instead of constant bitrate. CRF preserves visual quality and cuts file size 40-60% versus high-bitrate CBR. - "Unsupported format": X (Twitter) wants MP4. If you exported MOV or MKV, re-mux without re-encoding (ffmpeg `-c copy`) — no quality loss. - Upload hangs: chunked uploads often fail when the connection is unstable. Wired ethernet or a stable 50Mbps+ uplink resolves most large-file uploads.
The comparison table below shows max file sizes across the platforms most creators cross-post to alongside X (Twitter) — useful when planning a single export that satisfies every destination's cap.
X (Twitter) compared against 4 platforms most creators publish to alongside it.
| Platform | Max file size | Category |
|---|---|---|
| X (Twitter) | 512 MB | social-text |
| Threads | 1 GB | social-text |
| Bluesky | 50 MB | social-text |
| 5 GB | social-text | |
| Facebook Feed | 10 GB | social-mixed |
512 MB per single upload as of 2026-05.
Most "upload failed" errors on X (Twitter) aren't file-size — they're codec or container issues. Re-export as H.264 MP4 first; only worry about file size if you're over 512 MB.
Yes, up to the 512 MB cap. X (Twitter) will downscale to its native player resolution, so you're paying upload bandwidth for pixels the viewer never sees unless you specifically need future-proofing.
Use H.264 with CRF 18-23 (visually lossless to nearly-lossless), AAC audio at 192-256kbps. This typically cuts file size 40-60% versus a high-CBR master with no visible quality loss.
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