A 150 KB file-size match does not tell you which image looks better. That depends on the image being encoded, the format and settings, and how quality is judged. The title does not specify which three formats or images it means, and no available test establishes a direct three-format comparison at exactly 150 KB. The useful answer is therefore how to interpret such a comparison—and what evidence a fair test needs.
What does “same 150 KB” mean?
It could mean files are exactly 150 KB, encoders were adjusted to get close to that target, or each file is no larger than 150 KB. Those conditions are not interchangeable. A maximum-size test may leave one format below the limit, while an exact-size comparison may require adjusting settings until each file reaches the same byte count.
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The title also leaves the three formats unnamed. A recent works.tools comparison covers JPEG, PNG, WebP and AVIF, but it is not a three-format test at 150 KB. It cannot establish which three formats this title intends or supply a result for that specific condition.
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Why equal file size does not mean equal quality
Image formats encode image data differently, and settings determine how much detail is retained. At the same file size, one encoded image may preserve edges or texture better than another; the result can also vary between photographs, screenshots, graphics and transparent artwork. A meaningful comparison needs the same source image, comparable output sizes, disclosed encoding settings and a stated way to judge quality.
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What a disclosed quality method can show
In its September 22, 2026 comparison, works.tools encoded selected photographs until they reached SSIM 0.98, then compared file sizes. It reported that AVIF files were 40–45% smaller than JPEG in that test, while WebP did not achieve the same advantage. This is a result for that source’s selected photos and method—not a finding about three formats at 150 KB, every image, or which format looks best at a fixed size.
SSIM is one way to quantify similarity to an original image. A score makes a method more explicit, but it does not by itself show every visual difference a person may notice. A strong fixed-size comparison should include the encoded images at a consistent display scale as well as its metric and settings.
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What performance studies add—and what they do not
A separate study, “Web Image Formats: Assessment of Their Real-World-Usage and Performance across Popular Web Browsers”, reports that WebP and AVIF improved page-load time relative to compressed JPEG by 21% and 15%, respectively, under the study’s conditions. It also reports WebP at 4% in its measured web-scraping dataset. These are study-specific findings, not guarantees for a particular site or a measure of current market-wide format prevalence. They address browser performance and observed usage, not visual quality at 150 KB.
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What a fair three-format, 150 KB test should report
- Formats and inputs: Name all three formats and identify the exact source image or images. Separate photographs from screenshots, graphics and transparency-dependent artwork when those differences matter.
- Size rule: State whether 150 KB is an exact target, an approximate target or a strict maximum, and show the actual output sizes.
- Encoding procedure: Disclose the encoder and settings, including how each file was adjusted to meet the size rule.
- Quality assessment: Name any metric and its score or threshold, explain its limits, and show outputs at the same display scale so readers can inspect visible differences.
- Delivery context: Note whether the intended software, browser or workflow supports the formats and features being compared, such as transparency.
Without those details, a claim that one format “wins” at 150 KB cannot be checked or generalized. The available comparisons offer useful examples of disclosed methods and study-specific results, but they do not answer the title as a completed head-to-head test.
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