Open .crt Files Online — Free CRT Viewer
Open CRT File Online — Free & Instant
No signup required. Works in your browser.
📁 Drag & drop your file here
or click to browse • Max 100MB
✅ Free • ⚡ Instant • 🔒 Secure • 💻 No install
What Is a .crt File?
A .crt file is a security format known as CRT. CRT is a security certificate file. This format is created by Various and is widely used by security analysts.
CRT files contain structured security data that requires compatible software to open. With OpenAnyFile, you can inspect and validate .crt files directly in your browser without installing any software.
How to Open .crt Files Online
- Visit OpenAnyFile CRT page
- Drag and drop your .crt file onto the upload area, or click "Browse" to select it
- OpenAnyFile automatically detects the CRT format using magic byte analysis
- View, analyze, and inspect and validate your file contents in the browser
- Optionally convert to PEM, DER, CER or download
Software That Opens .crt Files
.crt files are primarily created by Various. In the security space, you may encounter .crt files from third-party tools, online converters, or export functions. Regardless of the source, OpenAnyFile handles them all.
Open .crt on Different Platforms
- Windows: Use the original software or upload to OpenAnyFile for instant access
- macOS: Preview may not support .crt — use OpenAnyFile as a universal viewer
- Linux: Open-source alternatives exist, or use OpenAnyFile in any browser
- Mobile (iPhone/Android): OpenAnyFile works on all mobile browsers
Common .crt File Problems
Must match private key for SSL.
Other common issues include: your OS not recognizing the file extension, the file appearing corrupted after download, or lacking the required software. OpenAnyFile bypasses all these issues with universal format detection.
Convert CRT to Other Formats
CRT files can be converted to 3 formats including PEM, DER, CER.
Related Security Formats
If you work with .crt files, you may also encounter these security formats:
- 1Password Vault (opvault) — Open & convert opvault files online
- ACME Account (acme.json) — Open & convert acme.json files online
- AGE (.age) — Open & convert .age files online
- Age Encrypted (age) — Open & convert age files online
- ANSIBLE_VAULT (.yml) — Open & convert .yml files online
- ASC (.asc) — Open & convert .asc files online
- Authorized Keys (authorized_keys) — Open & convert authorized_keys files online
- Bitwarden Export (bitwarden.json) — Open & convert bitwarden.json files online
- CER (.cer) — Open & convert .cer files online
- ClamAV (.cvd) — Open & convert .cvd files online
Popular CRT Conversions
Frequently Asked Questions
What is a .crt file?
A .crt file is a security format called CRT. CRT is a security certificate file.
How do I open a .crt file without installing software?
Upload your .crt file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .crt files?
.crt files are typically created by Various.
Can I convert .crt to another format?
Yes. OpenAnyFile converts .crt to PEM, DER, CER.
Is it safe to open .crt files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .crt on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.