Edit, Sign & Secure · 15 guides

Edit, Sign and Secure PDFs

How to change a PDF without starting again: fix a typo, fill in a form, add a signature, then password-protect the file, watermark it or black out what others shouldn't see. These guides also cover the limits, such as which PDF passwords are easy to remove and why drawing a black box over text is not the same as redacting it.

15 articles in Edit, Sign & Secure

Aadhaar Card PDF Password: Format, Examples and How to Remove It
The Aadhaar card PDF password is the first four letters of your name in capitals plus your birth year. See UIDAI's examples, common mistakes and fixes.
4 Oct 20267 min read
How to Fill a Non-Fillable PDF Form (Type, Tick, Sign, Done)
Fill a non-fillable PDF form without printing it: type into any box, add ticks, dates and a signature, keep answers aligned, and flatten before you submit.
4 Oct 20268 min read
How to Edit a PDF for Free: Text, Images, Pages and Signatures
How to edit a PDF for free: fix existing text, add images and signatures, fill in forms, remove pages or hide details, and know when Word is the better route.
4 Oct 20269 min read
How to Password Protect a PDF (Free, on Windows, Mac or Online)
Password protect a PDF for free in your browser, in Word or with Preview on a Mac. Learn which password type to use, how to pick one and how to share it.
4 Oct 20267 min read
How to Sign a PDF Electronically (Draw, Type or Upload)
Sign a PDF without printing it: draw, type or upload your signature, add initials and the date, sign on a phone, and know what a drawn signature proves.
4 Oct 20268 min read
How to Remove a Password From a PDF You Can Already Open
Remove the password from a PDF you can open, such as a bank statement or salary slip: in your browser, through Chrome or Edge, or with Preview on a Mac.
4 Oct 20267 min read
How to Add Text to a PDF (Type Anywhere, on Any Device)
How to add text to a PDF for free: type anywhere on the page, match the size and font, use Preview or Edge's built-in tools, and keep your text from moving.
4 Oct 20269 min read
How to Edit Existing Text in a PDF (and Match the Font)
How to edit text in a PDF that's already on the page: change words step by step, get the font as close as possible, fix scans with OCR, and when to use Word.
4 Oct 20269 min read
Electronic Signature vs Digital Signature: What's the Difference?
Electronic signature vs digital signature in plain English: what each proves, what India's IT Act and other laws say, and how to check a signature in a PDF.
4 Oct 20269 min read
How to Redact a PDF Properly (So the Text Is Really Gone)
How to redact a PDF so the text is really gone: mark what must go, rebuild those pages as images, then prove it by searching, copying and extracting the text.
4 Oct 20268 min read
How to Add a Watermark to a PDF (Text or Logo, Free)
Add a text or logo watermark to a PDF free: readable settings, CONFIDENTIAL and DRAFT presets, chosen pages only, and how easily watermarks can be removed.
4 Oct 20268 min read
How to Compare Two PDF Files and Spot What Changed
Compare two PDF versions free in your browser: text and visual diffs, what each one misses, scanned files, and a checklist for reviewing contract changes.
4 Oct 20269 min read
How to Make a PDF Non-Editable (3 Methods, From Light to Locked)
Make a PDF non-editable three ways: flatten it, set a permissions password or turn pages into images. See what each stops, what it costs and its limits.
4 Oct 20267 min read
How to Remove Metadata From a PDF Before You Share It
See the hidden author, software and dates in a PDF, remove metadata or fix the title in one click, and catch the hidden details a metadata scrub misses.
4 Oct 20266 min read
What Does Flattening a PDF Mean? When and How to Do It
What does flattening a PDF mean? Form fields, comments and layers become fixed page content. See what changes, when to flatten, and how to do it free.
4 Oct 20267 min read

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