Password Protect PDF Document without any Software
Characteristics
File extension | |
Internet media type | application/pdf |
Description: | The Portable Document Format (PDF) is a universal file format invented in 1993 year by Dr. John Warnock from Adobe Systems. This invention caused the paper-to-digital revolution, because the main purpose of inventing PDF was to make document look the same way as the original version on any computer or device. |
Technical Details: | Every PDF file has a structure with fixed formatting and information about fonts and graphic elements on each page of a document. PDF document may contain different types of elements, such as buttons, hyperlinks, bookmarks, or annotations. PDF documents have complete description of a fixed-layout flat document that makes PDF similar to vector graphics file formats. |
Developed by | ISO |
Initial Release: | 15 June 1993 |
Useful links: | https://acrobat.adobe.com/us/en/acrobat/about-adobe-pdf.html https://fileinfo.com/extension/pdf |
How-to guide
How to password protect a PDF online
- Type AltoPasswordPDF in your browser and open the web page.
- Find the Choose File option and select the document you need to encrypt from your device.
- Enter a password and press Protect File Now.
- Download the protected file to your device or save it to an online storage service like Google Drive.
- Use additional tools if necessary. Send the file, edit it or add an e-signature
- Proceed with another document or finish the process.
Le tableau de comparaison des caractéristiques suprêmes
En raison de la multitude de concurrents sur le Web, il peut être difficile de choisir un logiciel idéal, surtout si vous ne le comparez pas avec précision. Notre tableau comparatif vous aidera à identifier facilement votre solution préférée pour Protect PDF Documents. Veuillez vous familiariser avec les fonctionnalités avancées de AltoPassword.
Smallpdf | Adobe | ||||||||||||||||||||||||||
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View & edit
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Convert from PDF | |||||||||||||||||||||||||||
Convert to PDF | |||||||||||||||||||||||||||
Mac PDF converter | |||||||||||||||||||||||||||
Multi-platform | |||||||||||||||||||||||||||
Sign & secure | |||||||||||||||||||||||||||
No software downloads | ✔ | ✔ | ❌ | ||||||||||||||||||||||||
Cloud storage | Unlimited | No info | No info | ||||||||||||||||||||||||
Price | Free | Free 7-Day Trial paid | Free 7-Day Trial paid | ||||||||||||||||||||||||
Encryption and security | ✔ | ✔ | ✔ | ||||||||||||||||||||||||
Support | 24/7/365 | No info | ✔ | ||||||||||||||||||||||||
No ads | ✔ | ✔ | ✔ | ||||||||||||||||||||||||
How to Password PDF Files
FAQ
How do I encrypt a PDF to email?
If you need to send an important document via email, it has to be encrypted in advance. In order to do it, open AltoPasswordPDF, create a suitable password for your document and save the changes. After that, you can be sure that the information the file contains will be available only to people who you gave the PDF password to.