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1200×628 JPEG · summary_large_image
Design assets often have to ship at a single canonical size — an icon set, a profile picture, a thumbnail — because platforms or frameworks will reject anything off-spec. Twitter Card Summary Large Image produces 1200×628 JPEG, the size Twitter Card Summary Large Image expects.
| Output dimensions | 1200×628 pixels |
|---|---|
| Aspect ratio | 1200:628 (1200:628) |
| Output format | JPEG @ 90% quality |
| Processing | 100% in your browser — no upload |
| Cost | Free, unlimited |
| Source | Official guidelines |
Audience: around 500 million active users.
How Twitter / X ranks images: real-time feed with For You ranking that weighs replies, reposts, and bookmarks above likes. Posting at the platform's exact native dimensions (1200×628 px) preserves your original framing and avoids the softening that happens when the platform's own resampler runs to fit its expected size.
Platform-specific note: Twitter's image preview crops aggressively to 16:9 in the timeline; clicking opens the full image.
This preset is a deterministic recipe — every step has fixed parameters so the result is byte-identical across runs of the same input.
Twitter Card Summary Large Image crops your input to 1200:628 and resizes it to 1200×628 px as JPEG — a 753-kilopixel output. The work runs through canvas APIs and a WebAssembly image-encoder; the source image is decoded into an off-screen canvas, transformed in place, and re-encoded without any network upload.
Design deliverables to clients often require an exact pixel-size; this preset's deterministic output makes the deliverable repeatable. The browser-side path also means the file never leaves your device — relevant when the input contains personally identifiable information, screenshots of private documents, ID scans, or proprietary product photography.
1200×628 px, saved as JPEG at quality 90%.
The target platform — see the cited spec — uses 1200:628 as its native frame. Submitting any other ratio means the platform's own crop runs, which often clips faces or text near the edge.
The target accepts JPEG, and JPEG compresses photographic content 5-10× smaller than PNG with no visible difference at quality 90%. PNG is the right choice only when the image has hard edges or transparency — which photo-ID, social posts, and product photos don't.
No. This preset runs entirely in your browser using WebAssembly + canvas APIs — no server round-trip. You can verify this in your browser's network panel: only static asset requests, no image upload. The file never leaves your device.