WMV Compressor
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Supports: WMV
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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Need help?How to Compress WMV Files Online
- Upload Your WMV Files: Drag and drop or click "Add Files" to select WMV recordings — Windows Movie Maker exports, screen captures from older Camtasia / Snagit versions, conference call recordings, archived .wmv lecture videos. Batch is supported, so an entire folder of legacy clips can go in at once.
- Pick a Compression Mode: Choose a quality preset (Highest → Lowest), target a percentage of the original size (e.g., 50%), or set an exact target file size in MB / GB. Each file auto-scales to hit your number.
- Pick Codec and Resolution (Optional): Default keeps WMV2 inside the .wmv container so Windows Media Player / older PowerPoint embeds keep working. Switch to WMV1 for the broadest legacy playback or MSMPEG-4 for lighter encodes. Drop the resolution preset to 720p, 480p, or 360p when the source is downscaled or just needs to fit on a phone.
- Compress and Download: Click Compress. Files process in your browser session and download individually or as a ZIP — no sign-up, no watermark, no upload to a third-party server.
Why Compress WMV Files?
WMV (Windows Media Video) was Microsoft's default video format through Windows XP, Vista, and 7. It's still common in archives — old Movie Maker exports, classroom screen recordings, PowerPoint embedded videos, conference call captures, and corporate training libraries built before 2015. WMV files from that era are often larger than they need to be because they were authored before disk space and bandwidth got cheap. Common reasons to compress WMV:
- Shrinking decade-old archives — A folder of 2008-2014 family videos exported from Movie Maker can easily be 50-200 GB. A pass at the Medium quality preset typically drops the total 40-60% with no visible quality change on a modern screen.
- Email and chat attachments — Gmail caps at 25 MB per attachment, Outlook at 20 MB, Slack free at 1 GB per file. Most raw WMV recordings exceed these limits; compressing to a percentage target makes them fit.
- Loading into PowerPoint without bloating the deck — Embedded WMV files balloon .pptx file size. A 200 MB lecture clip compressed to 30-50 MB keeps the deck portable across email and SharePoint.
- Archival before deletion — Before retiring an old hard drive, compress the WMV library to a tenth of its original footprint and move it to cloud storage. Quality remains acceptable for "look back at it once a year" use.
- Web upload for legacy LMS / SharePoint — Some older internal portals still accept .wmv but cap individual uploads at 100-250 MB. Compressing to fit avoids a re-export from the source tool.
- Phone / tablet playback of training videos — Old corporate WMV training material plays fine on Windows but stutters on iOS. Compressing at 480p / 720p makes mobile review smooth.
For broader compatibility (smart TVs, phones, browsers, social media), convert WMV to MP4 instead — MP4 with H.264 or H.265 typically produces 30-50% smaller files than WMV at equivalent quality and plays everywhere.
WMV vs MP4 — Format Comparison
| Property | WMV | MP4 |
|---|---|---|
| Default codec | WMV (1/2/3, VC-1) | H.264, H.265, AV1 |
| Native player | Windows Media Player, older PowerPoint | Every modern OS, browser, phone, smart TV |
| Compression efficiency | Older, less efficient | 30-50% smaller at the same quality |
| Browser playback | Limited (Edge legacy / IE) | All major browsers |
| Mobile playback | Inconsistent on iOS / Android | Native everywhere |
| Best for | Legacy Windows workflows, .pptx embeds | Any modern use case |
Compression Mode Quick Guide
| Mode | What it does | Best for |
|---|---|---|
| Quality preset (Highest → Lowest) | Internal encoder tuning | One-click result, no decisions |
| File size percentage | Output ≈ N % of input | Predictable shrinkage across a batch |
| Exact target size | Output ≤ X MB / GB | Fitting an email or LMS upload cap |
| Resolution preset (1080p → 360p) | Downscale alongside re-encode | Phone / tablet review, big shrinkage |
Frequently Asked Questions
How much can I shrink a WMV file?
Typical reductions: 30-50% at default-quality presets while staying inside the .wmv container, 50-70% when dropping from 1080p to 720p alongside a Medium preset, 70-85% when also targeting an aggressive percentage. Old Movie Maker exports from the WMV3 / VC-1 era often shrink the most because they were encoded with conservative bitrates. Sample: a 1.2 GB 2010-era family WMV reliably comes out to 350-500 MB at the Medium preset with no visible change.
Should I keep WMV output or switch to MP4?
Keep WMV if the file feeds back into a Windows-only workflow — older PowerPoint decks, internal SharePoint portals that whitelist .wmv, or Movie Maker re-imports. Switch to MP4 for everything else: modern smart TVs, phones, browsers, social uploads, family sharing. MP4 is universally compatible and 30-50% more efficient. See WMV to MP4 for the conversion path.
Will my compressed WMV still open in Windows Media Player and PowerPoint?
Yes — keeping the default WMV2 codec inside the .wmv container preserves compatibility with Windows Media Player on every Windows version since XP, and with PowerPoint's embedded video on 2010 / 2013 / 2016 / 2019 / 365. PowerPoint can be picky about codecs; sticking with WMV2 is the safest pick for embeds.
Why is my WMV so much larger than an MP4 of the same length?
The WMV codec family (WMV1, WMV2, WMV3 / VC-1) predates H.264. At the same visual quality, WMV needs roughly 30-50% more bits than H.264 and roughly 2× the bits of H.265. That's why a 5-minute 1080p WMV from 2010 can be 400 MB while a 5-minute 1080p MP4 (H.264) is closer to 150-250 MB. Compression here re-encodes the WMV more aggressively, but converting to MP4 typically beats it on size.
Will Windows Movie Maker / Movie Maker Live still re-import the compressed file?
Yes when output stays .wmv with WMV2 — Movie Maker's import path matches that container and codec. If you switch the output to MP4, older Movie Maker versions may refuse it; in that case keep WMV output for round-trip editing.
Can I trim during compression to make the file even smaller?
Yes — use the trim section to cut intros, dead air at the start of screen recordings, or post-meeting silence at the end. Trimming is far more effective at shrinking files than tweaking quality. A 60-minute recording trimmed to 45 minutes of useful content is 25% smaller before any encoder settings.
Will audio quality drop noticeably?
At the High and Medium quality presets, the WMA audio track is re-encoded at a bitrate that preserves intelligibility for speech and reasonable fidelity for background music — most viewers won't notice. At the Low preset, dialogue stays clear but music loses sparkle. For voice-only content (lectures, screencasts, conference calls), even the Lowest preset is usually fine.
Can I compress dozens of legacy WMV files in one batch?
Yes — drop in an entire folder of archived WMVs. Files process in parallel within your browser session and download individually or as a single ZIP. Useful when retiring an old hard drive's worth of training material, family videos, or screen recordings to a single compressed archive.
Does this work on Mac or Linux for WMV files?
Yes. Compression runs entirely in the browser, so the operating system doesn't matter — Mac and Linux work the same as Windows. This is the practical answer for anyone who inherited a WMV archive but no longer has a Windows machine to play / process them on.