WMV Compressor
Compress WMV files locally — no upload, no watermark, free. Output is universal H.264 MP4 that plays everywhere.
Recommended FFmpeg settings
WMV (Windows Media Video) is Microsoft's video format, introduced in 1999 as part of Windows Media. WMV uses Microsoft's proprietary VC-1 codec (also known as WMV9). The format was widely used in the Windows XP/Vista era for video downloads, screen recordings, and Windows Media Center content. WMV lost ground to H.264/MP4 after 2010. This WMV compressor decodes WMV input and re-encodes to H.264 MP4 at CRF 26, typically reducing file size 50-80% while preserving quality acceptable for web and social media. The output is a universally-compatible MP4 file with AAC stereo audio and the +faststart flag for instant streaming playback across browsers, phones, tablets, and smart TVs. Compressing WMV before sharing means your video plays everywhere without compatibility headaches.
- 1Universal playback and modern codec efficiency. WMV→MP4 typically yields 30-50% size reduction with same perceived quality.
- 2WMV files commonly contain codecs like VC-1 (WMV9) is the primary codec. Older WMV files may use WMV7 or WMV8. Audio is WMA (Windows Media Audio) Standard or Pro.
- 3Typical sources include Windows Movie Maker exports (default on Windows XP/Vista), Windows Media Center recorded TV (.wtv/.dvr-ms often converted to WMV), Older corporate training and webinar recordings, and similar.
- 4Local processing means no upload bandwidth and no server storing your files.
- 5Free, no account, no watermark — compress unlimited videos.
- 6CRF 26 encoding is tuned specifically for typical WMV content profiles, preserving source quality.
Three steps, no account needed
From raw footage to shareable MP4 in seconds — all in your browser.
Upload your video
Drag-and-drop or click to browse. Files are processed locally — nothing is uploaded to any server.
Pick quality
Use the recommended preset or fine-tune CRF / resolution in advanced settings.
Download
Compression runs entirely in your browser. Grab your smaller MP4 in seconds — no account, no watermark.
Why people choose this compressor
Built for everyday use — fast, private, and free forever.
100% Browser-Based
Your video never leaves your device. No upload, no server-side processing, no privacy concerns.
No Watermark
Output is clean H.264 MP4 — no logos, no overlays, no time limits baked in.
Free & Unlimited
No sign-up, no credit card, no daily cap. Compress as many videos as you need.
Fast FFmpeg Engine
Powered by FFmpeg compiled to WebAssembly — the same engine professionals use, now in your browser.
Universal MP4 Output
Output is H.264 + AAC in an MP4 container — plays everywhere, uploads everywhere.
Cross-Platform
Works on Windows, macOS, Linux, iOS, and Android — any modern browser.
Who uses this tool
Windows Movie Maker exports (default on Windows XP/Vista)
Modernize windows movie maker exports (default on windows xp/vista) to universal H.264 MP4 without quality loss beyond the unavoidable CRF-based compression.
Windows Media Center recorded TV (.wtv/.dvr-ms often converted to WMV)
Modernize windows media center recorded tv (.wtv/.dvr-ms often converted to wmv) to universal H.264 MP4 without quality loss beyond the unavoidable CRF-based compression.
Older corporate training and webinar recordings
Modernize older corporate training and webinar recordings to universal H.264 MP4 without quality loss beyond the unavoidable CRF-based compression.
Pre-2010 Microsoft Stream/Office 365 video
Modernize pre-2010 microsoft stream/office 365 video to universal H.264 MP4 without quality loss beyond the unavoidable CRF-based compression.
Frequently asked questions
The tool decodes your WMV file and re-encodes the video stream to H.264 with Constant Rate Factor (CRF) compression. Audio is converted to AAC. The result is wrapped in an MP4 container for universal compatibility. Typical size reduction is 50-80% for WMV sources, depending on the original codec and bitrate.
Other tools you might need
MP4 Compressor
Compress MP4 files locally with smart H.264 CRF encoding. No upload, no watermark, free. Reduce file size 50-80% in seconds — works on any device with a modern browser.
Compress Video for Instagram
Hit Instagram's spec sweet spot — 1080×1920 for Reels and Stories, H.264 MP4. No upload, no watermark, runs entirely in your browser.
Compress Video to 1080p
Downscale or upscale to 1080p (1080p) with smart H.264 CRF encoding. Browser-based, free, no watermark, runs entirely client-side.
Compress Video Under 50MB
Shrink your video to fit under 50MB with adaptive bitrate. 50MB sits between email limits (25MB) and full messaging compatibility. It's the limit for Discord N Browser-based, free.