Any file up to 500 MB. Drop several files and they come back as one ZIP. Many image, audio and video conversions run in your browser; anything else is uploaded and removed within the hour.
Convert FLV video files to AAC audio format efficiently. This tool is perfect for extracting high-quality audio tracks from legacy Flash video files.
FLV (Flash Video) is a container format historically used for streaming web content, while AAC (Advanced Audio Coding) is a specialized audio container designed for efficient digital compression. When you convert FLV to AAC, you are performing a stream extraction and transcoding process, effectively stripping the video layer and isolating the audio data. Because both formats utilize lossy compression algorithms, this transformation involves re-encoding, which inherently leads to a minor loss in signal fidelity.
Since both formats are lossy, repeated re-encoding will reduce audio quality; however, the file size will remain relatively similar to the original audio stream found within the FLV container.
We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.
Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.
Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.
A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.
Clips, streams, screen recordings, and movies.
Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG
Raster and vector graphics for web, print, and photography.
Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF
Office files, PDFs, ebooks, and plain text.
Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT
Music, podcasts, voice recordings, and sound effects.
Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS
