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 your modern web-optimized WEBM files into legacy FLV containers for compatibility with older Flash-based players. This tool is essential for developers maintaining legacy systems that require the Adobe Flash Video structure.
WEBM is a modern, open-source container designed primarily for HTML5 video, typically utilizing VP8 or VP9 codecs. In contrast, FLV is an older container format originally developed for Adobe Flash Player. Converting from WEBM to FLV involves re-wrapping the video stream into the FLV container structure, which is optimized for streaming in legacy browser environments.
Since both formats are lossy, this process involves transcoding, which inevitably leads to a minor reduction in visual quality due to secondary compression.
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
