Is there a file size limit?

There is no strict file size limit. However, very large files (over 500MB) may be limited by your device's available memory.

What are the advantages of PFX over CER?

PFX Certificate offers identical to P12 with Windows-friendly extension, while CER Certificate is known for identical use to CRT — just an alternative extension name. The best choice depends on your specific needs — compatibility, quality, or file size.

How does Xonvert compare to desktop software?

Xonvert offers comparable quality to desktop converters with the convenience of browser-based access. No installation, no updates, instant availability.

Is it safe to convert my CER files here?

Absolutely. Your files never leave your device — all processing happens in your browser using WebAssembly technology.

Is there an API for CER to PFX conversion?

Xonvert is a browser-based tool without a server API, since all processing happens client-side. For automated conversion, you can use Xonvert's PRO features or integrate the underlying open-source libraries directly.

Are my files uploaded to a server?

No. Zero files are transmitted anywhere. Xonvert processes everything using client-side JavaScript and WebAssembly. Your files stay on your machine.

Can I preview the PFX output before downloading?

Yes. Xonvert shows a preview of your converted file so you can verify the result before saving it to your device.

Convert CER to PFX

Fast, free, and secure CER to PFX conversion. No registration required.

cer

pfx

Certificate

Fast, free, and secure CER to PFX conversion. No registration required.

Drag & drop your file here

or click to browse

Loading limits...

Related Conversions

PEM→PFX

CRT→PFX

P12→PFX

High Quality

Maintain maximum quality during conversion

Fast Processing

Convert files in seconds with our optimized engine

Secure & Private

Files automatically deleted after conversion

How to Convert CER to PFX

Upload CER File

Click the "Select File" button to upload your cer file from your device.

Start Conversion

Click the "Convert" button to instantly start converting to PFX.

Download PFX

Download your converted pfx file immediately after processing.

Related Conversions

PEM to PFX — Instant Certificate Conversion | XonvertTurn DER into PFX — Free Online ConverterConvert Certificate File to PFX Certificate Online — Fast & FreeConvert CER to PEM — Free Online Certificate ConverterCER to DER Converter — Free, Private, No UploadConvert .cer to .crt Free — Certificate Converter | XonvertCER to P12 Converter — Free, Private, No UploadConvert .cer to .p7b Free — Certificate Converter | XonvertConvert CER to P7C — Free Online Certificate ConverterTurn P12 into PFX — Free Online ConverterConvert P7B Certificate Chain to PFX Certificate Online — Fast & FreeP7C to PFX — Instant Certificate Conversion | Xonvert