PDF Koru
YeniPassword-protect your PDF
PDF Koru Nasıl Kullanılır
- 1Bir PDF yükleyin
- 2Şifre girin ve onaylayın
- 3PDF'yi Koru'ya tıklayın
- 4Korunan dosyayı indirin
PDF Koru Hakkında
PDF Koru, pdf-lib kullanarak belgenizi bir şifreyle şifreler. Alıcıların dosyayı açmak için şifreye ihtiyacı vardır. Hiçbir dosya yüklenmez — her şey tarayıcınızda çalışır.
PDF Koru Temel Özellikleri
- Fast and accurate Protect Pdf processing
- No installation required — works in browser
- Free to use with no limitations
- Privacy-focused — data never leaves your device
- Mobile and desktop compatible
- Instant results with live preview
- No watermarks or content changes applied
- No account or installation required
Desteklenen Formatlar
Giriş Formatları
Çıkış Formatları
Only user (open) password protection is applied. The PDF must not already be encrypted — unlock it first if needed.
Örnekler
Protect a contract before emailing
Add a password to a PDF contract so only the intended recipient can open it.
Giriş
Unprotected contract PDF
Çıkış
Password-protected PDF — recipients need the password to open
Secure a financial report
Encrypt a sensitive financial PDF before uploading to a shared drive.
Giriş
Financial report PDF
Çıkış
Encrypted PDF with password access control
Yaygın Kullanım Senaryoları
- Professional Protect Pdf tasks
- Quick everyday calculations
- Educational purposes and learning
- Business and workplace productivity
- Personal projects and hobbies
- Securing academic thesis drafts during external review
Sorun Giderme
Unexpected results
Çözüm
Double-check your input format and ensure all required fields are filled correctly.
Tool not working
Çözüm
Clear browser cache and refresh. Ensure JavaScript is enabled.
Trying to protect a PDF that is already password-protected
Çözüm
Unlock the PDF first with the Unlock PDF tool to remove the existing password, then add the new one.
Sıkça Sorulan Sorular
Şifreleme bir sunucuda mı yapılıyor?
Hayır. pdf-lib dosyanızı tamamen tarayıcınızda şifreler.
Şifremi unutursam ne olur?
Kurtarma yolu yoktur. Şifrenizi güvenli bir yerde saklayın.
What encryption algorithm is used?
pdf-lib applies RC4 128-bit encryption, which is the standard user-password protection scheme supported by Adobe Acrobat, macOS Preview, and all major PDF viewers.
Can I restrict printing or copying while still allowing opening?
Currently only user (open) password protection is supported. Owner permission restrictions — such as disabling printing or text copying — are not separately configurable in this tool.
Will password protection work in all PDF readers?
Yes. Standard PDF user password encryption is a core part of the PDF specification and is supported by Adobe Acrobat, macOS Preview, browser PDF viewers, mobile apps, and all major PDF software.
Can I protect a PDF that already has a password?
No. The tool requires an unprotected PDF as input. Use the Unlock PDF tool to remove the existing password first, then apply the new password.
Can the password contain spaces or special characters?
Yes. Any printable character is allowed including spaces, punctuation, and symbols. Avoid extremely unusual Unicode characters for maximum compatibility across PDF readers.
What is the maximum password length?
Standard PDF encryption supports passwords up to 32 characters. For strong security, use at least 12 characters combining uppercase letters, lowercase letters, numbers, and symbols.