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Does anyone know a decent open source tool to edit PDF form fields (create them, assign a name, ...)?

Or even fill the forms of the existing PDFs... I'm struggling with many PDF forms, usually from various government agencies. They all seem to require Adobe Reader and can't open them anywhere else. And the few that I can open and input the values have broken field calculation (for example they won't add values from field A and B into field C).

There also seems to be two ways to fill a field. I notice this when I fill fields on a PDF in Chrome and save it. And then open it in Preview.

Preview doesn't show the values I put into the fields in Chrome.

Also kinda unrelated but also worth mentioning, if you have a PDF document with a version less than 1.7, opening and reexporting or even reprinting it in Preview.app as PDF will not actually manage to get you a document that's PDF1.7 or above.

I had to use postscript to do it.

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