evanw/thumbhash

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

4197 stars · 91 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

ThumbHash is a compact encoding of an image placeholder that can be stored inline with data and rendered while the real image loads. It is a BlurHash alternative with more detail, aspect ratio, accurate colors, and alpha support, with implementations in JavaScript, Rust, Swift, and Java.

Use cases

• generate tiny image placeholders for smoother lazy loading
• store compact image previews inline in a database
• show blurred placeholders while images load in a feed
• encode image aspect ratio and colors in a few bytes
• replace BlurHash with better color accuracy and alpha support

When to choose

• you need compact image placeholders with alpha and aspect ratio support
• you want more detail and accurate colors than BlurHash in similar space
• you work in JavaScript, Rust, Swift, or Java

When to avoid

• you need configurable encoding parameters
• you need a full-featured image format rather than a placeholder
• you rely on the broader BlurHash ecosystem

Facets

library · maturity stable

image-processing serialization image-processing web-development frontend cross-platform rust jvm image-placeholder blurhash-alternative lazy-loading thumbhash javascript swift

Member repositories

For agents

markdown · JSON · MCP: product_card(name="evanw/thumbhash")