Question 1

What if the image can't be compressed to my target size?

Accepted Answer

If the target is extremely small (e.g., 10KB for a high-resolution photo), the tool will compress to the lowest quality possible and show "Best effort —target not fully met." In that case, try resizing the image dimensions first using the Image Resizer , then compressing.

Question 2

How does the binary search algorithm work?

Accepted Answer

The algorithm starts at quality 50%, checks if the output is above or below the target, then halves the search range: if too large, try lower quality; if small enough, try higher quality. After ~15 iterations it converges to the highest quality that produces a file within your target size.

Question 3

Why does the output size sometimes exceed the target by a few KB?

Accepted Answer

JPEG compression is not perfectly predictable —the actual output size depends on image complexity. The algorithm tries to get as close as possible while staying under the target, but final blob size may vary by 1— KB. If strict compliance is required, set your target slightly lower (e.g., 95KB instead of 100KB).

Question 4

Should I use JPEG or WebP to achieve the smallest file?

Accepted Answer

WebP generally produces smaller files at the same visual quality. Use WebP if the platform you're uploading to supports it. Use JPEG for maximum compatibility with older systems and image editors.

圖片壓縮指定大小

什麼是 Compress to 100KB？

如何使用 Compress to 100KB

圖片壓縮指定大小

什麼是 Compress to 100KB？

如何使用 Compress to 100KB

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