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ThumbHash Encoder and Decoder (~25-Byte Placeholders)

Hash any image into roughly 25 bytes, alpha included, and render the placeholder back as hex, Base64, or CSS, with the average color and aspect ratio.

A 25-byte placeholder for any image

or click to browse from your device
Select Files

Supports: PNG, JPG, JPEG, WEBP, AVIF, GIF, BMP, TIFF
encodedecode

ThumbHash (MIT) hashes RGBA, alpha included. Into roughly 20-25 bytes. This tool box-filters the input to 100 px on the long edge first (the codec ceiling); the hash is the same for a 4000 px original and its 100 px sample.
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Next door in Photos

- BlurHash (/images/blurhash)
- LQIP Placeholder (/images/placeholder)
All photos tools (/images)

Canonical HTML: https://nutter.tools/images/thumbhash
Markdown version: https://nutter.tools/images/thumbhash/index.md
Plain-text version: https://nutter.tools/images/thumbhash/index.txt
Agent index: https://nutter.tools/llms.txt