# How to sign a PDF on iPhone (in seconds) | Nimbo

> Sign any PDF on your iPhone with your finger: draw once, reuse your saved signature, add a stamp, then share or password-protect the signed file.

On iPhone with Nimbo

# How to sign a PDF on iPhone (in seconds)

Written by the Nimbo team · Last updated October 3, 2026

Short answer

To sign a PDF on iPhone, open it in Nimbo, tap PDF Tools, then Sign. Draw your signature once with your finger, place it on the page, and save. Nimbo keeps your signature for next time and can add a company stamp or a password before you send the file.

## Step by step

1. Open the PDF in Nimbo (from Files, Mail, or the Library).
2. Tap PDF Tools, then Sign.
3. Draw your signature with your finger, or pick a saved one.
4. Drag it where it belongs and resize it with a pinch.
5. Optional: add a stamp such as APPROVED, or protect the PDF with a password.
6. Tap Done, then Share to send the signed PDF.

## Why Nimbo

- Saved signatures: sign the next contract in one tap.
- Stamps and password protection in the same place.
- No account: your signature never leaves your iPhone.

## Frequently asked questions

### Is a signature drawn on iPhone legally valid?

A simple electronic signature may be enough for many everyday documents, such as quotes, leases or school forms, but legal requirements vary by country and document type. Some documents require a specific or qualified signature: check with the other party if you're unsure.

### Can I sign a PDF someone emailed me?

Yes. In Mail, tap the attachment, then Share, and choose Nimbo. The PDF opens ready to sign.

### Is my signature uploaded anywhere?

No. Signatures are stored on your device only. Nimbo has no account and no tracking.

## Related tools

[Sign PDF](https://nimbopdf.com/sign-pdf/)[Fill PDF form](https://nimbopdf.com/fill-pdf-form/)

## More guides

- [How to scan a document to PDF on iPhone](https://nimbopdf.com/how-to-scan-a-document-to-pdf-on-iphone/)
- [How to translate a whole PDF on iPhone and keep the layout](https://nimbopdf.com/how-to-translate-a-pdf-on-iphone/)
- [How to ask questions to a PDF on iPhone (with the exact source)](https://nimbopdf.com/how-to-ask-questions-to-a-pdf-on-iphone/)
- [How to create a designed PDF with AI on iPhone](https://nimbopdf.com/how-to-create-a-pdf-with-ai-on-iphone/)

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Source: https://nimbopdf.com/how-to-sign-a-pdf-on-iphone/ · Nimbo (English) · https://nimbopdf.com/llms.txt