reduced MB after putting text on my photo

[hildev499825]

Dear,

A Jpg foto of 5.0 MB is reduced to 3.95 MB after putting a text on it in Photoshop.

how come? this surely means los of quality...

grts, Hilde

[c.pfaffenbichler]

Resaving any jpg means damaging the image. 

jpg employs lossy compression and the effect cumulates with each re-save … 

Edit: If I remember correctly jpg would theoretically allow for non-lossy compression methods, but practically when we speak about jpg in Photoshop we are speaking about jfif with lossy compression.