How to screenshot a Google Sheet

Google Sheets doesn't have a built-in "export as image" command, so screenshotting a sheet means either an OS-level screenshot or exporting the file first and using a tool built for spreadsheet data. Which one makes sense depends on whether you want the whole visible sheet or a clean, cropped range.
The OS screenshot tool
The same options as any other browser tab: Cmd+Shift+4 on Mac, Win+Shift+S on Windows. This captures exactly what's rendered on screen at your current zoom and scroll position — which means it includes Google's toolbar and row/column headers unless you crop them out, and it's limited to whatever fits in the viewport. A wide sheet with many columns, or a sheet zoomed out to fit more rows, ends up with either tiny illegible text or a screenshot that's simply cut off at the edge of the window.
Selected cells specifically
If you only want a range — a few rows, one table, a single column of totals — the OS screenshot tool still works, but you're manually drawing a rectangle over the right pixels rather than selecting the actual cells. Any header text taller or shorter than a row throws off your crop, and there's no way to include the exact cell boundaries without eyeballing it.
Long sheets: the scrolling problem
A sheet taller than one screen can't be captured in a single OS screenshot without scrolling and stitching multiple shots together — browser "capture full page" extensions handle this for a normal webpage, but Sheets renders as a virtualized grid, so some extensions capture a mostly-blank scroll area instead of the actual rows, since off-screen cells aren't in the page's DOM until you scroll to them. The more reliable fix for a genuinely long range is to reduce what you're capturing to the specific rows that matter rather than the whole sheet — see below.
Exporting the file and working from data instead
Google Sheets can export the whole spreadsheet as a real file: File → Download → Microsoft Excel (.xlsx) or Comma Separated Values (.csv). Once you have that file, a tool that reads spreadsheet data directly — rather than screenshotting pixels — sidesteps the viewport and zoom problems entirely, since it's working from the actual values instead of whatever's currently rendered on screen.
That's the workflow Celtrim is built for: download the Sheet as .xlsx or .csv, upload it, drag to select exactly the range you want — a full sheet, one table, or a handful of cells — and export a clean PNG. Because the selection isn't tied to your browser's viewport, it works the same way for a three-column table and a hundred-row sheet, and there's no scrolling or stitching involved.