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Progressive decoding: JPEG vs JPEG XL vs AVIF

Jon Sneyers · 21.4K views · 2020-11-18 · 0:40

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Overview

A short side-by-side demo of a large image loading over a slow connection in JPEG, progressive mozjpeg, JPEG XL and AVIF. It shows how each codec renders partial data.

On Hacker News

HN uses it as visual evidence that JPEG XL decodes progressively while AVIF shows nothing until fully loaded.

Recommended by 1 HN people across 1 months · HN mentions 2021–2026

Topics

Audio & video engineeringInformation theory & signal processingWeb development
Search by tags
jpeg xlavifprogressive decodingimage compressionweb performance

What people said

149765 · 2024-03 · Recommendation

A couple of videos comparing progressive decoding of jpeg, jxl and avif: [VIDEO] [LINK] There's more on the same channel, generation loss ones are really interesting.

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cubefox · 2026-07 · Reference

Progressive decoding isn't expected to speed up decoding, it's expected to speed up displaying large image files, especially for downloads via slow mobile connections. Example: [VIDEO]

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supermatt · 2023-09 · Reference

High quality progressive decoding at reduced filesizes is a big positive for me. There is no other format that supports that. [VIDEO]

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Sources

Video by Jon Sneyers, played through YouTube.

Data and selection notes

HN summaries and labels may contain AI errors. HN dates refer to discussions, not video publication.

HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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