Step 1: Drop the .ai file onto the canvas
Drag the file onto app.svgsketch.com, or choose File > Import... and pick it. The editor checks the first bytes rather than trusting the extension, so a file renamed from .pdf or .eps is recognized for what it is. Nothing leaves your machine.
Step 2: Review the import dialog
The dialog names the kind of file and the Illustrator version that saved it, and lists the artboards with their sizes. Select the artboards you want; each becomes a view in the document at its canvas position.
Keep "Keep text editable" for a document you will keep working on, or choose "Convert text to outlines" when the artwork has to match the file exactly. "Import hidden layers" brings hidden layers in as hidden, so nothing is silently lost. Choose "Replace the current document" for a fresh document or "Insert into the current document" to add the artwork to what is open.
Step 3: Find your layers in the Elements panel
Top-level layers and sublayers arrive as named groups. Locked layers lock their contents and hidden layers are hidden through the eye toggle. Objects named in Illustrator keep their names, and a layer the file left empty still appears in order.
Step 4: Read the import report
When something was approximated, rasterized or dropped, or a font is missing, a banner offers the report; it is also under File > Last Import Report.... Fonts the document needs are listed with "Load fonts" to fetch them, so type is never quietly swapped for a lookalike. "Copy report as JSON" keeps a record.
Step 5: Edit and export
From here the document is ordinary SVG: edit paths with the Edit tool (E), restyle in the Appearance panel, and export from the Export panel with "Optimize with SVGO" for a compact .svg.