What is a .Sketch file?
A Sketch file is a UI-design document from the Mac app of the same name: pages holding artboards, artboards holding layers, and symbols that let one component be reused across the lot. Under the extension it is an ordinary ZIP archive full of JSON.
- Did you know
- Sketch switched from a binary format to zipped JSON in version 43, which is why a .sketch file can be read by anything - and why design tools can diff one in version control.
- Sketch is made by the Dutch firm Bohemian Coding, now Sketch B.V., and won an Apple Design Award in 2012.
- Since 2017 (Sketch 43) a .sketch file has been a ZIP archive of JSON describing the document, an open structure that let a whole ecosystem of plugins and developer-handoff tools read Sketch files directly.
- What Analyser shows you
- Open Sketch documents (.sketch) and read the whole design. The file is a ZIP of JSON, so nothing has to be guessed at: every page, artboard, group and layer appears in a browsable component tree with its type, child count and size in points. Components (Sketch calls them symbols) are listed with how many instances each one has, so you can see which parts of a design system are actually load-bearing and which are unused. All the copy in the document is pulled out into one readable list with the page each string sits on, the bitmaps placed into the design are extracted and shown, and the preview Sketch saves inside the file is displayed alongside the app version, fonts used, colour assets and shared styles.
- Open a .Sketch file
- Drag a .Sketch file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
- Related formats
- Browse the full list of supported file types.