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 heavy AVI video files to the highly compatible MP4 format instantly. This tool is ideal for users who need to play legacy video files on modern mobile devices or upload them to web platforms.
AVI (Audio Video Interleave) is an older container format developed by Microsoft that often results in large file sizes due to low compression. MP4 (MPEG-4 Part 14) is the modern standard that uses advanced H.264 or H.265 codecs to maintain high visual fidelity while significantly reducing the file size, making it perfect for streaming and storage.
By using efficient compression settings during the AVI to MP4 conversion, you can retain original visual quality while drastically reducing the overall file size.
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
