Is it safe to convert FLV to MKV online?

Yes! Convert999 processes all files directly in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

How long does it take to convert FLV to MKV?

Conversion is nearly instant for most files. Large files may take a few seconds depending on your device's processing power.

Is there a file size limit?

Convert999 supports files up to 2GB. Processing happens locally, so larger files depend on your device's available memory.

Do I need to install any software?

No installation required. Convert999 works entirely in your web browser on any device.

Free · No Upload · Instant

Convertir FLV a MKV Online — Gratis y Rápido

Convertidor online gratuito de FLV a MKV. Convierte tus archivos Flash Video a formato Matroska Video al instante en tu navegador.

Elegir Archivos

o arrastra y suelta archivos aquí

Tamaño máximo: 2GB

Tus archivos se procesan localmente en tu navegador. Nada se sube a ningún servidor.

Cómo Convertir FLV a MKV

Sube tu archivo FLV haciendo clic en "Elegir Archivos" o arrástralo.

Selecciona MKV como formato de salida.

Haz clic en "Convertir Ahora" y descarga tu archivo convertido.

Sobre el Formato FLV

Extension: .flv
Full name: Flash Video

Sobre el Formato MKV

Extension: .mkv
Full name: Matroska Video

Preguntas Frecuentes

¿Es seguro convertir FLV a MKV en línea?

¡Sí! Convert999 procesa todos los archivos directamente en tu navegador. Tus archivos nunca se suben a ningún servidor.

¿Cuánto tiempo toma convertir FLV a MKV?

La conversión es casi instantánea para la mayoría de los archivos.

¿Hay un límite de tamaño de archivo?

Convert999 soporta archivos de hasta 2GB.

¿Necesito instalar algún software?

No se requiere instalación. Convert999 funciona completamente en tu navegador web.

Can I convert FLV to MKV on my phone?

Yes! Convert999 works on any device with a web browser — iPhone, Android, iPad, or desktop. No app installation required. Simply open the converter, upload your FLV file, and download the converted MKV file.

Will I lose quality converting FLV to MKV?

Convert999 uses high-quality conversion algorithms to minimize quality loss. For lossless formats, the conversion is exact. For lossy formats like images and audio, we use optimized settings that balance quality and file size.

Can I batch convert multiple FLV files to MKV?

Yes, Convert999 supports batch conversion. Select or drag & drop multiple FLV files and convert them all to MKV format at once. Each file is processed locally in your browser.

What is the difference between FLV and MKV?

Flash Video (FLV) and Matroska Video (MKV) differ in compression, compatibility, and features. FLV is optimized for its native use cases, while MKV may offer different advantages. Visit our FLV vs MKV comparison page for a detailed breakdown.

Why Convert FLV to MKV?

Advantages

✓Matroska Video offers better compatibility with modern applications and workflows
✓Converting is completely free with no file size limits on Convert999
✓Your files never leave your device — 100% private and secure conversion
✓Instant conversion without waiting for server processing

Key Differences

→FLV (Flash Video) is optimized for its native use cases
→MKV (Matroska Video) may offer different compression or feature set
→Choose based on your target platform, quality needs, and file size requirements

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