Adobe Illustrator file viewer
An .ai file is famous for opening in the wrong way. Modern Illustrator puts the drawing in a PDF container but keeps the artwork itself in a private stream — and when the "Create PDF Compatible File" box was unticked on save, every other program shows Adobe's housekeeping notice asking you to re-save, instead of the picture. The owner concludes the file is broken. This tool reads the private data directly, so it shows the artwork where others show a refusal. Illustrator 8 and older files are pure PostScript, and the same code handles them: the language inside both generations is the same one.
Drop an .ai or .eps. Any age will do — yesterday's file from Illustrator 2025 and one saved in the nineties alike.
Beside it: the artboard size, how many shapes and layers there are, which fonts the file asks for, and the Illustrator version it was made in.
SVG keeps the curves and opens in any browser, editor or layout program. PNG is there for when a picture is all you need.