Does cropping preserve the animation in an APNG?

Yes. The crop is applied to every frame at the same coordinates, so frame count, per-frame delays, loop count, and blend/dispose settings are all preserved. APNG stores the loop count in the acTL chunk at the file level, not per frame, so a forever-looping APNG keeps looping forever after the crop.

Will cropping keep the transparency in my APNG?

Yes. APNG carries true 8-bit alpha (256 levels of opacity per pixel), and the crop preserves it exactly — soft drop shadows, anti-aliased edges, and partial-transparency gradients all come through cleanly. This is the main reason to keep an animation as APNG rather than crop it to GIF, whose 1-bit transparency would turn smooth edges jagged.

Why does my cropped APNG sometimes come out larger than the original?

Heavily optimized APNGs store only the changed pixels between frames using blend and dispose operations. Cropping requires the encoder to coalesce frames (rebuild each one as a complete image) before re-cropping, and if it doesn't re-optimize aggressively the output can grow. Following the crop with a pass through compress APNG usually brings it back below the original size.

Can I crop an APNG to a circle?

The crop selection is rectangular. APNG does support a clean circular cutout because of its 8-bit alpha, but that requires masking rather than cropping — crop to a tight square first, then apply a circular alpha mask in an image editor. The rectangular crop itself only changes the canvas dimensions.

What's the largest APNG I can upload to crop?

The practical limit is upload size and time rather than your device — most animated PNGs are well under the cap, and even multi-megabyte sticker sets and long UI-motion loops upload and crop without trouble. If your APNG is large mainly because of dimensions, cropping (and optionally resizing) is the most direct way to shrink it.

Should I crop or resize first?

Crop first, then resize. Cropping removes pixels at the source resolution; resizing afterwards downscales only the region you kept. Doing it the other way wastes detail by downscaling pixels you're about to throw away. In our testing, a 600×600 APNG sticker cropped to a 1:1 subject and then scaled to 320×320 stayed visibly sharper than the same file resized first and cropped second — xconvert applies the crop before the resize internally, so you get the better order automatically.

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