The Short Answer

Open Edit PDF, upload your file, choose the Add Text tool, and type or paste your Hindi text. Place it on the page, adjust the size and colour, and download the edited PDF. The Hindi is shaped properly, so conjuncts such as क्ष, त्र and ज्ञ and vowel signs such as कि, की, कु and कू appear correctly. Everything runs in your browser, so your file is not uploaded.

Why Hindi Is Hard in Most PDF Editors

Hindi is written in the Devanagari script. Letters join into conjuncts, and vowel signs move around the letter they belong to. Many PDF editors only know basic Latin fonts, so Hindi turns into question marks, empty boxes, or letters with the signs in the wrong place.

PDF Section handles Hindi using the Noto Sans Devanagari font, which is applied only when your text contains Hindi characters.

How to Add Hindi Text to a PDF

Open Edit PDF.
Select your PDF.
Choose the Add Text tool and click where the text should go.
Type Hindi with your keyboard, or paste text you have copied from somewhere else.
Set the size and colour. You can also make it bold.
Download the edited PDF.

You can mix Hindi and English in the same line.

How to Type Hindi on Your Device

Windows: add the Hindi keyboard in Settings, under Time and Language, then Language and Region.
Mac: add a Hindi input source in System Settings, under Keyboard.
Android and iPhone: add the Hindi keyboard in your keyboard settings.
Without changing settings: type in a Google Input Tools style transliteration site, then copy and paste the Hindi into the editor.

What to Know About the Result

Hindi text is drawn as shapes. This gives the correct letter forms, but the Hindi text you add cannot be selected or copied from the finished PDF, and it will not be found by a search.
Regular and bold are available. There is no italic style for Hindi.
Your original file is not changed. You download a new copy.
Scanned pages need OCR first. A scan is a picture. To get real text from a scanned page, use OCR PDF.

Other Things You May Need

Fill in a form or add a name or date: use Add Text.
Sign the document: Sign PDF.
Translate the text of a PDF into Hindi: Translate PDF. It sends text to a translation service, so avoid it for confidential files.
Shrink the file before emailing it: Compress PDF.

Is It Private?

Yes. The editing happens in your browser, and the file never goes to a server. This matters for Aadhaar, bank, school and government forms. See why uploading private PDFs is risky.

Quick Answers

Is it free? Yes, with no sign-up.
Can I edit Hindi text that is already in the PDF? Adding new Hindi text is the reliable route. For existing text, check the result carefully, because the original font may not be reusable.
Does it work on a phone? Yes, in a mobile browser, though a laptop is easier for placing text precisely.

Hindi PDF Editor Online: How to Add Hindi Text to a PDF (Free)