Image requirement guide
The 20 KB preset prioritizes a passing file size while retaining the strongest quality that fits the limit.
Twenty kilobytes is a strict ceiling for a photographic image. The tool first searches the available JPEG quality range and then shows a fail state when the requested canvas still cannot fit. That makes the tradeoff explicit: a passing file may need smaller dimensions, a simpler source, or a destination that accepts a larger limit.
For avatars, signatures, and application thumbnails, the canvas often matters more than the original camera resolution. Set the required width and height if the destination provides them, choose crop or fit deliberately, and confirm the measured bytes in the validation report before downloading.
Questions people ask
No. Some dimensions and images cannot reach that ceiling without severe quality loss. Aftermath reports the failure rather than pretending the requirement passed.
The preset starts with JPEG because it offers a useful quality search for small photographic files. You can change the output format when the destination requires PNG or WebP.
The 20 KB route starts with JPEG output and a strict 20 × 1024-byte maximum. The local encoder first tunes quality; because this preset fixes no pixel dimensions, it can reduce the canvas if quality alone cannot pass. The result panel reports actual output bytes and fails the requirement if the ceiling is still missed. Use it only when the destination genuinely states a 20 KB maximum.
A legacy upload form states a strict 20 KB maximum for a small identification photograph.
Observed operation: Encode a JPEG locally, search quality first and reduce the canvas only when quality search alone cannot meet 20 × 1024 bytes.
Review the result: Check the actual byte count and inspect facial or text legibility at normal viewing size before downloading the copy.
Boundary: Passing an unusually small byte ceiling can produce visible damage and does not prove the portal will accept the image.
Produce a JPEG no larger than 20 KB for an exceptionally restrictive image-upload ceiling.
The selected image stays in the current browser session and is not sent to an Aftermath processing service. How local processing is verified.
Checks the displayed limits and reports or creates a separate processed image copy or local measurement report from one supported local image.
A local measurement or export does not guarantee acceptance by an external destination.
