# How to write on a PDF: fill in and sign forms without printing, and edit the text when you must

> **The short answer**: To write on a PDF for free, upload it to Adobe Acrobat's online Fill & Sign tool, type into the fields or add a text box and your signature, then download it with a free Adobe account. On iPhone, Preview fills and signs forms. Changing text already in the file needs Word or Acrobat Pro.

**Key takeaways**

- Writing on top of a PDF is free; changing its original text is a different job.
- Adobe's browser tool needs a free account before you can download the filled file.
- On iPhone: Preview > Form Filling button, then the Add button for a signature.
- Word converts a PDF into an editable copy and leaves the original alone, but the layout can shift.

![Write on a PDF: fill in and sign forms without printing](https://tiswa.app/assets/blog/write-on-pdf/write-on-pdf-cover-en.webp)

## How do I write on a PDF for free in my browser?

1. **Open Adobe's tool**: Go to the Fill & Sign page on the official Adobe Acrobat site. It is free and runs in the browser with nothing to install.[^1]
2. **Upload the file**: Choose the file from your device or drag it onto the page.
3. **Type in the fields**: Click into each field and type. On a form with no fields, add a text box anywhere on the page; the original content is not altered.[^2]
4. **Add your signature**: Choose Sign > Add signature, then type, draw or upload an image of your handwritten signature and place it in the student box.[^1]
5. **Sign in**: A free Adobe account is required to download or share the file.[^1]
6. **Download and check**: Choose Next > Download, open the file and check every entry sits inside its box without covering the next line.

![5-step flow: Open the tool / Upload the file / Sign in / Fill in the fields / Add your signature](https://tiswa.app/assets/blog/write-on-pdf/write-on-pdf-inline-1-en.webp)


> **Tip**: University forms carry your ID and phone number, sometimes your IBAN for the stipend. Do not upload them to a site you do not know, and delete the copy from your account once the request is approved.

## How do I write on a PDF on my phone?

On iPhone, use the built-in Preview app. If the file came in a message, save it to Files first.[^4]

1. **Open the file**: Open the PDF in Preview.
2. **Turn on form filling**: Tap the Form Filling button, then tap a blank field and type.[^3]
3. **Use AutoFill**: Tap the AutoFill suggestion above the keyboard to fill your name and number from your card in Contacts.[^3][^4]
4. **Sign**: Choose Add > Signature, draw it with your finger and drag it into place.[^3][^4]
5. **Share it**: Send it from the Share button to your university email or portal.

On Android, or on iPhone if you prefer, the Adobe Acrobat mobile app has the same fill and sign tools.[^1] If the form is on paper in your hand, scan it into a clean PDF first with [scan documents to PDF on iPhone](https://tiswa.app/en/blog/iphone-scan-documents-pdf/).

## How do I edit the text already in a PDF?

With Word. Adobe's free tool does not edit existing text; that is in Acrobat Pro, which has a 7-day free trial.[^2] Word opens a PDF directly:

- Go to File > Open and pick the PDF.
- Word makes a copy and converts it into an editable document; your original PDF is left untouched.[^5]
- Edit the text like any document.
- Save it back in the same format: File > Save As or Save a Copy, then choose PDF from the list.[^6]

Expect the layout to move a little and footnotes to land in odd places. It works best on files that are mostly text; a page that is all graphics comes in as a single image you cannot edit.[^5] The full walkthrough is in [convert PDF to Word](https://tiswa.app/en/blog/pdf-to-word/).

## Writing on a PDF vs editing it: which do you need?

| What you need | Tool | University example |
|---|---|---|
| Fill in fields and sign | Fill & Sign in the browser, or Preview on iPhone | Co-op form, declaration, equivalency request |
| Type on a form with no fields | A text box in Adobe's tool | Your name and ID on a scanned form |
| Change words already in the file | Word after converting, or Acrobat Pro | Fixing a typo in your paper saved as PDF |
| Handwritten study notes | A notes app on iPad | Highlighting lecture slides |

![Comparison card of the guide table](https://tiswa.app/assets/blog/write-on-pdf/write-on-pdf-inline-2-en.webp)


Only the third row needs a conversion; everything else is writing on top of the page. Pen apps are compared in [note-taking apps for iPad](https://tiswa.app/en/blog/note-taking-apps-ipad/).

## Why is my text missing, or why was the form rejected?

Most often because the copy you sent is not the copy you filled. The other causes we see:

- You sent the blank file: the filled one downloaded under a different name. Open the attachment before you hit send.
- Text ran out of the box and covered the next line: shrink the font or shorten it.
- The form changed shape: you converted it to Word and back. Use the fill tool for official forms.
- The portal rejected it for size after you added your transcript and CV: shrink it with [compress a PDF](https://tiswa.app/en/blog/compress-pdf/).
- The signature landed in the advisor's box instead of yours.

If the form must go in one file with your transcript and CV, combine them with [merge PDF files](https://tiswa.app/en/blog/merge-pdf/). For the CV itself, see [CV for students](https://tiswa.app/en/blog/cv-for-students/).

## Worked example: a co-op acceptance form

The placement sends an acceptance form as a PDF and wants it back signed, in one file with your CV and transcript. Start by saving an untouched copy under a clear name, so a mistake in one box costs you nothing.

Gather your details before opening the tool: full name as in your record in Arabic and English, student ID, major, university email and the training period your department set. Fill the boxes in the order they appear, sign the student box only, and leave the advisor and company boxes empty. Open the download on your phone too; small text that reads fine on a laptop can vanish on a phone screen. Then merge it with the CV and transcript and name the final file with your name and ID.

## Do universities accept an electronic signature on a form?

Most internal forms do, but some offices insist on a handwritten signature on paper or a signature through their own official system. Read the form's instructions or ask the department before sending. Never sign a file you have not read in full: an added signature means you agree to its contents, exactly as on paper. And never edit a file that is not yours, such as an official letter or a transcript; that is a disciplinary matter, not a technical one.

> **tiswa's take**: Our view at tiswa: do not convert official forms. Fill the fields, add the signature and leave the file as the office designed it, because a form that changed shape tends to come back. Keep a blank original before you start, since fixing one wrong field is easier than starting over. Keep Word for your own files: an old paper, or a summary you want to update.

File, design and study software has student pricing. tiswa collects it in [study tools](https://tiswa.app/en/deals/study/). [Join tiswa](https://tiswa.app/en/join/)

## Questions

### How do I write on a PDF for free?

Upload it to Adobe's free Fill & Sign tool in your browser, type or add a text box and your signature, then sign in with a free account to download it.

### How do I write on a PDF on my phone?

On iPhone, open it in Preview and tap the Form Filling button. On Android, use the Adobe Acrobat app.

### Can I edit the text in a PDF for free?

Yes, with Word: File > Open converts the PDF into an editable copy, which you save back as PDF. Adobe's free tool only adds text on top.

### How do I add a signature to a PDF?

In Adobe's tool choose Add signature, then type, draw or upload an image of it and place it on the page.

### Does converting a PDF to Word change the layout?

It can. Microsoft says the converted copy may not match the original exactly, and it works best on mostly-text files.


## Sources

[^1]: Adobe Acrobat: Sign PDFs with a free PDF form filler, https://www.adobe.com/acrobat/online/sign-pdf.html
[^2]: Adobe Acrobat: Free online PDF editor, https://www.adobe.com/acrobat/online/pdf-editor.html
[^3]: iPhone User Guide: Fill out and sign PDF forms in Preview, https://support.apple.com/guide/iphone/fill-out-and-sign-pdf-forms-iphd7e3c0c74/ios
[^4]: iPhone User Guide: Fill out forms, sign documents, and create signatures, https://support.apple.com/guide/iphone/fill-forms-sign-documents-create-signatures-iph1d3607e5c/ios
[^5]: Microsoft Support: Opening PDFs in Word, https://support.microsoft.com/en-us/word/opening-pdfs-in-word
[^6]: Microsoft Support: Save or convert to PDF or XPS in Office desktop apps, https://support.microsoft.com/en-us/office/save-or-convert-to-pdf-or-xps-in-office-desktop-apps-d85416c5-7d77-4fd6-a216-6f4bf7c7c110