Remove metadata from a GIF

What we deliberately keep

• The Graphic Control Extension carries frame delay, disposal method and the transparent colour index. Drop it and your animation loses its timing and transparency.
• The NETSCAPE2.0 block carries the loop count. Drop it and an infinitely looping GIF plays exactly once.
• An embedded ICC colour profile, if present, so colours still render correctly.

Both survive here, and both are covered by tests. We remove comment blocks, plain-text blocks, XMP, and any data appended after the trailer.

What a real dump looks like

GIF's metadata surface is small compared to a photo format, and that's by design of the format itself, not a limitation of this tool. A GIF has no equivalent of EXIF — no GPS, no camera serials — because the format predates digital cameras by years and was never extended to carry that data. What it does carry is Comment Extension blocks, free text occasionally used by tools that made or re-saved the file to stamp a signature or version string, and an XMP packet some editors wrap in an Application Extension block using the identifier XMP DataXMP.

The full block structure — including the two blocks this page deliberately keeps — comes from the original GIF89a specification, written by CompuServe in 1989 and never formally revised since. It's short enough to read in one sitting, and it's the reason every GIF decoder on Earth agrees on what a Graphic Control Extension does.

The one nobody expects: GIF can carry a colour profile

GIF's Application Extension block — the same mechanism NETSCAPE2.0 uses for the loop count — is a generic slot identified by an 11-byte application identifier and authentication code, and vendors have used it for more than looping. An application extension identified as ICCRGBG1 carries an embedded ICC colour profile, the same category of data a JPEG or PNG might carry for accurate colour rendering. It's rare in practice — most GIF encoders don't write one — but when it's present, it's kept by default here for the same reason an ICC profile is kept everywhere else on this site: it's rendering data, not identifying data, and removing it can shift how colours display without revealing anything about who made the file.

What survives common editors

Most GIF-making tools — screen recorders, meme generators, the export dialog in Photoshop — rebuild the file from raw frames rather than editing an existing one, so metadata from an original source GIF rarely survives a re-export at all. Where it does show up is GIFs re-saved without re-encoding, usually by command-line tools that patch metadata in place without touching the frame data. That's also the safest way to check a GIF is clean: compare the frame count and loop behaviour before and after, which is exactly what this page's animation-preserving strip verifies automatically.

Cleaning something else?

GIFs rarely carry much worth removing compared to a PNG screenshot or a JPG photo, both of which pick up far more from the tools that made them. Clearing out a whole meme folder? The batch cleaner processes any number of files at once.