---
title: "Embed data into PDF form on iOS | Nutrient SDK"
canonical_url: "https://www.nutrient.io/guides/ios/forms/submit-or-save/embed-data-into-pdf/"
md_url: "https://www.nutrient.io/guides/ios/forms/submit-or-save/embed-data-into-pdf.md"
last_updated: "2026-05-23T00:08:18.111Z"
description: "By default, Nutrient will save entered form field values into a PDF file if the file is writable, or to an external file if the PDF file isn’t writable."
---

# Embed data into PDF forms on iOS

By default, Nutrient will save entered form field values into a PDF file if the file is writable, or to an external file if the PDF file isn’t writable. This means the values will be retained the next time the document is opened. Read more about how to configure saving in our [annotation saving mechanism](https://www.nutrient.io/guides/ios/annotations/annotation-saving-mechanism.md) guide.

Auto-saving is enabled by default in [`PDFViewController`](https://www.nutrient.io/api/ios/documentation/pspdfkitui/pdfviewcontroller). For details about auto-saving triggers, see our [saving triggers for annotations and bookmarks](https://www.nutrient.io/guides/ios/annotations/annotation-and-bookmark-saving-triggers.md) guide.
---

## Related pages

- [Save and submit PDF Forms to Document Engine on iOS](/guides/ios/forms/submit-or-save/to-document-engine.md)
- [Submit and save PDF forms to external destinations](/guides/ios/forms/form-submission.md)
- [Submit and save PDF forms to custom destinations](/guides/ios/forms/submit-or-save/to-custom-destination.md)