Invert Image

How Invert Image works

Invert every colour in an image to get a photographic negative. Inversion is useful for reading light-on-dark documents and creating negatives. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Every channel flipped

Invert maps each channel to 255 minus its value. Black becomes white, a mid-grey stays mid-grey, and a saturated colour becomes its complement on the RGB wheel — red becomes cyan, green becomes magenta.

Because all three channels flip independently, the result is not a photographic negative in the film sense; it is the exact arithmetic inverse of the pixels.

Genuine uses

Turning light-on-dark UI mockups into printable dark-on-light versions, reversing a scanned negative, and making a mask for compositing where black and white need to swap.

Inverting a photo of a document produces white text on black — readable on a screen at full brightness and unusable in print.

Limits

Alpha is untouched, so transparent regions stay transparent rather than becoming opaque white. Colours shift in perceptual brightness — a dark blue can invert to a bright yellow that feels much lighter than the original felt dark.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions