This is a tool that I vibecoded yesterday with Google Gemini 2.5 Pro.
https://mattmontag.com/tilemap.html
It works with 8x8 pixel tiles in sequential sprite order (e.g. as exported from MAME with the F4 tileviewer). You click on the top left tile of your sprite in the Tilemap Source, click on "Auto Assemble" and adjust the width/height of the sprite until it matches up. Then, Add to Queue. Be sure to enable "Autopilot mode" to automatically advance the tilemap cursor and auto-assemble the following sprite.
The "Text Spec" is a copy/paste friendly format so that you can pick up where you left off or make manual edits. One sprite per line: [sourcerow],[sourcecol];[spriterows],[spritecols].
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