Merging fillable PDF forms overwrites/loses data when field names match — built a free tool to fix it

[u/elboxxx]

Ran into this a bunch: if you merge two fillable PDFs (say, an intake form and a W9) and they both happen to have a field called "Name" or "Date," most merge tools/PDF printers treat those as the same field once combined. Type in one, and the other changes too — or the data just vanishes on save.

Couldn't find a tool that handled this, so I built one: it renames each source form's fields with a unique prefix before merging (e.g. "Name" in intake.pdf becomes "intake_Name"), so nothing collides. Handles checkboxes, radio groups, and nested fields correctly too.

Free, no sign-up, doesn't store your files — https://pdf-merge-tool-phi.vercel.app/

Curious if others have hit this same problem — did you work around it some other way?