fatcousin
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manifesto
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why fatcousin exists — local-first, no uploads.
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save this toolset to your device — works offline.
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hide a message inside an image · LSB pixel encoding · extract on the other end · runs locally
[
mode
]
(•)
hide message
( )
reveal message
[
image
]
png, jpg, webp, bmp — any image · output always saved as png
or click
Select file
[
secret message
]
[
hide & download png
]
[
how it works
]
encodes using LSB (least significant bit) — the lowest bit of each R/G/B channel
changes are sub-0.4% intensity per pixel · visually indistinguishable
output is always PNG — JPEG compression would destroy the hidden data
accepts any image format as input · png recommended for round-tripping
everything runs in your browser · no data is uploaded
[
status
]
>
ready