Fix 'File Not Supported' Error on WhatsApp Web
Many users encounter the frustrating "the file you tried adding is not supported" error when trying to upload or send MP4 or MOV files via WhatsApp Web (especially on Chrome or Opera GX browsers). This usually happens because the video uses a high-efficiency codec (like HEVC/H.265), an unsupported profile, or is missing a proper 'faststart' header.
How We Fix Your Video
This tool re-processes your video using the most compatible settings for WhatsApp's web interface:
- H.264 Baseline Profile — ensures maximum compatibility with all browsers for successful uploading.
- YUV420p Pixel Format — the universal standard for web video playback and browser compatibility.
- Faststart Flag — moves metadata to the beginning of the file so WhatsApp Web can process and upload it immediately.
- AAC Audio — industry-standard audio compression recognized by all browser versions.
🔒 100% Private — Processed Locally
Unlike other converters, this tool runs entirely in your browser. Your private videos are never uploaded to a server. This is critical for WhatsApp users who value the privacy of their personal messages and media.
Step-by-Step Guide
- Drag and drop the video that WhatsApp Web won't accept (showing "File not supported").
- Wait a few seconds while FFmpeg re-encodes the file locally in your browser.
- Download the fixed MP4.
- Attach the new file to your WhatsApp Web chat — it will now upload and send successfully!
Technical Details
ffmpeg -i input.mp4 -c:v libx264 -profile:v baseline -level 3.0 \
-pix_fmt yuv420p -c:a aac -b:a 128k -movflags +faststart output.mp4