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640×640 JPEG · square
Each social platform crops uploaded media to its own aspect ratio before showing it in feeds. Uploading at the platform's native size — here, Weibo feed posts — preserves the framing you intended and avoids the soft-focus that comes from the platform's own resampler. This preset outputs 640×640 JPEG at the square ratio that Weibo expects.
| Output dimensions | 640×640 pixels |
|---|---|
| Aspect ratio | 1:1 (square) |
| Output format | JPEG @ 90% quality |
| Processing | 100% in your browser — no upload |
| Cost | Free, unlimited |
| Source | Official guidelines |
Audience: 580+ million monthly users in China.
How Weibo ranks images: real-name verified; algorithmic feed similar to Twitter. Posting at the platform's exact native dimensions (640×640 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: Weibo image servers re-encode all uploads; the platform's own watermark is added on share.
This preset is a deterministic recipe — every step has fixed parameters so the result is byte-identical across runs of the same input.
Weibo Profile Avatar crops your input to 1:1 and resizes it to 640×640 px as JPEG — a 409-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.
Social-platform uploads frequently re-encode the file at the platform's CDN; running this preset locally before upload lets you see the exact pre-upload state. 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.
640×640 px, saved as JPEG at quality 90%.
The social this preset targets uses 1:1 framing. For passport photos this matches the printed-photo standard; for social posts it's the safe ratio that fills the feed without horizontal cropping.
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.