Robust DCT steganography

Hide one image inside another.

Embed a secret image into the DCT coefficients of a cover image so it survives JPEG/WebP re-compression and proportional rescaling. Everything runs locally in your browser — no uploads, no server.

Zero dependencies
Blind extraction
Anti-rescale
GPL-3.0

Cover image Click to choose, or drop a file. Recommended ≥ 512×512. Secret image Hidden inside the cover.

Capacity —

Cover enhance

High qualityAnti-compression

Balanced Visual subtlety and compression resistance

Pairs / block 2

Repeat 1

ECC strength 48

Min margin 40

Margin gain 1.4

Max margin 200

Secret long edge 1280

Cover

Secret

Stego result