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A 150 KB file-size match does not tell you whether three images look equally good. To make that comparison meaningful, you need to identify the formats, use the same source image, and explain whether 150 KB is an exact size, a target, or a maximum. The available evidence does not identify which three formats this title means or provide a matching 150 KB test, so it cannot support a format-by-format verdict.
What “same 150 KB” can—and cannot—tell you
File size measures how much storage an encoded image occupies. It does not measure visual quality. Different formats can encode the same source image to the same size while producing different visible results; the comparison depends on the image, encoding settings, and how quality is judged.
The 150 KB condition also needs definition. An exact-size requirement, an approximate target, and a maximum-size ceiling are different tests. A useful report states which one it uses and gives the actual output sizes.
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Why there is no supported three-format winner here
The title does not name the three formats, and the available comparison evidence covers four formats—JPEG, PNG, WebP, and AVIF—not a three-format test at 150 KB. The evidence therefore cannot establish what three particular formats deliver at that size.
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A September 22, 2026 comparison by works.tools encoded its selected photographs until they reached SSIM 0.98, then measured file size. In that test, AVIF files were 40–45% smaller than JPEG, while WebP did not achieve the same advantage. This is a result for that source’s photographs and method; it is not a 150 KB comparison or a universal ranking.
What a fair fixed-size test needs to show
Use the same input image
Encode each format from the same original, rather than comparing unrelated images. If the test covers photographs, screenshots, graphics, or transparent artwork, identify those categories separately: results from one kind of image should not be generalized to all the others.
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State the size rule and encoding choices
Say whether 150 KB is an exact target, an approximate target, or a ceiling, and report the resulting file sizes. Disclose the encoding settings or procedure used to reach the target. Different settings can change what the output looks like.
Explain how quality was judged
Show the outputs at a consistent display scale and explain the visual-quality criterion. A perceptual metric such as SSIM can make a method more transparent, but a score is not the same as a complete account of every visible difference. The works.tools comparison’s SSIM 0.98 threshold is one disclosed method, not a universal standard.
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Include practical constraints
Depending on the use case, compare transparency support, suitability for the image type, and compatibility with the intended software or delivery environment. The available evidence does not establish winners for these factors in a three-format, 150 KB test.
How to interpret broader benchmark findings
A research paper indexed on arXiv reports that, in its study, WebP and AVIF improved page-load time relative to compressed JPEG by 21% and 15%, respectively. It also reports WebP at 4% in the dataset measured by its web-scraping analysis. These are findings from that paper’s study and dataset, not guarantees for a particular website or a statement of current market-wide format use. See the paper’s abstract.
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Page-load performance and visual quality at a fixed file size answer different questions. A result about one does not, by itself, establish which format looks best at 150 KB.
What you can conclude
At the same 150 KB, you know the files occupy the same amount of space only if the test defines and verifies that match. You do not know whether they look equally good, or which format is preferable, without the named formats, common image inputs, disclosed encoding settings, and a stated quality method. The available comparisons offer useful examples of how to report methods and study-specific findings, but they do not supply that missing head-to-head.
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