WTV Compressor

Compress WTV (Windows Recorded TV Show) Files Online

WTV is the container Windows Media Center wrote when it recorded live TV, and the recordings are enormous for a simple reason: they store the broadcast stream at close to the bitrate the station sent, with essentially no re-encoding. This tool rebuilds the video stream to a size you choose and hands back a smaller .wtv file. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours.

WTV Format at a Glance

How to Compress a WTV File

1. Upload Your WTV File: Drag the .wtv recording onto the page or click "Add Files". Recorded-TV files are routinely several gigabytes, so the upload is usually the longest part of the job — not the encode.
2. Pick a Compression Method: "Target file size (%)" is the default and is marked (Best); the slider sits at 80% out of the box, which is a mild trim, so drag it toward 30-50% for a real reduction. The alternatives are "Specific file size", "Constant Bitrate", "Variable Bitrate", "Constant Quality" and "Constraint Quality".
3. Leave Auto Scale On, or Trim the Recording: Auto Scale is on by default and reports "[Smart Scaling Active]" — it picks output dimensions that fit your size target instead of letting the picture turn to mush. Switch it off and the "Video resolution" controls appear, with 1080p / 720p / 480p presets, a percentage, or an explicit width and height. Under "Trim", choose "Time Range" and set a start time and duration to drop the padding Media Center recorded either side of the show.
4. Compress and Download: Click Compress and download the result. No sign-up, no watermark.

What Actually Makes a Recorded-TV File Smaller

There is no lossless shortcut here. A WTV recording is already a compressed broadcast stream, so making it smaller means re-encoding the video — decoding every frame and writing new ones at a lower bitrate. That costs picture quality, and the loss is permanent; keep the original if the recording matters. Three levers move the number:

• Bitrate — the dominant one. Broadcast MPEG-2 spends 8-19 Mbit/s on HD; halving that halves the file. Fast motion (sport, action) shows the loss first.
• Resolution — dropping 1080i to 720p removes about 55% of the pixels, which lets the same bitrate look considerably cleaner. Auto Scale does this for you when a size target is aggressive.
• Runtime — Media Center padded recordings before and after the scheduled slot. Trimming that padding and the ad breaks is the only reduction that costs zero quality.

Because the output of this page stays in the WTV container, there is no video or audio codec choice here — the codec lists have no selectable entries when the target extension is .wtv. Choosing a codec is a conversion job, not a compression job.

Why Converting to MP4 Usually Beats Compressing in Place

Media Center is gone, and .wtv went with it. Nothing outside old Windows builds — no phone, no smart TV, no console, no browser — opens the format, and most editors refuse it. If you are re-encoding anyway, convert the recording to MP4 with H.264 instead: the same quality loss buys you a file that plays everywhere and is typically far smaller, because H.264 reaches comparable picture quality at roughly a third to a half of the bitrate broadcast MPEG-2 needs. Compressing in place only makes sense when something in your workflow specifically requires a .wtv file.

Copy-Protected Recordings Cannot Be Decoded

Media Center honoured the copy-protection flags broadcasters and cable operators set. Recordings from channels marked copy-once or copy-never — typically premium cable channels received through a CableCARD tuner — were encrypted with Windows Media DRM and licensed to the PC that made them. That protection is part of the file, so no converter, compressor or remuxer can read the video: not this tool, not FFmpeg, not a desktop app. If a recording plays only on the original machine, or a copy prompts for a licence elsewhere, it is protected and the job will fail or produce an empty result. Free-to-air recordings from an antenna tuner are almost always unprotected and process normally.

Frequently Asked Questions

Why is my WTV file so large?

Because Media Center recorded the broadcast almost verbatim. An ATSC over-the-air multiplex carries up to roughly 19 Mbit/s across a 6 MHz channel, and an HD programme can claim most of that. At 8-19 Mbit/s, one hour of recording is 3-8 GB before you count the AC-3 audio, captions and guide data the container also stores.

Can I compress a WTV file without re-encoding it?

No. Everything except trimming requires decoding and re-encoding the video, which loses quality. The only zero-loss reduction available is cutting footage you do not need — the padding at the start and end, or the ad breaks.

Should I compress the WTV or convert it to MP4?

Convert, in almost every case. Both operations re-encode, so the quality cost is the same, but MP4 with H.264 plays on hardware that has never heard of Media Center and reaches a given quality at a much lower bitrate than the MPEG-2 inside a typical recording. Stay on .wtv only if a specific legacy Media Center setup still needs to read the file.

My WTV recording will not convert — is it copy protected?

Very likely. Recordings flagged copy-once or copy-never are DRM-encrypted and readable only on the recording PC, so the decode step fails no matter which tool you use. Check whether the file plays on a second computer: if it asks for a licence, the content is protected and there is no legitimate way to re-encode it.

What compression method should I use for a recorded TV show?

Start with "Target file size (%)", which the interface labels (Best). In our testing, percentage targets are the method that lands closest to the requested size on broadcast material, because bitrate on a recorded programme swings sharply between dialogue and action and a fixed bitrate has to be set for the worst case. Use "Specific file size" only when you have a hard ceiling to hit, and "Constant Quality" when the size does not matter but the picture does.

Will compressing keep the episode title and channel information?

The show title and basic descriptive fields normally survive a re-encode into another .wtv file, but treat the richer Media Center guide payload — series metadata, thumbnails, chapter and caption data — as expendable. If that metadata is the reason you are keeping the recording, archive the original file alongside the compressed copy.

Can I cut the ad breaks and the recording padding?

Yes, one range at a time. Set "Trim" to "Time Range", give a start time and a duration, and only that section is encoded — which is both the fastest and the only quality-free way to shrink a recording. If cutting is all you need and you do not want to re-encode the whole programme, use Trim WTV instead of this page.

What happens to my recording after it is compressed?

The file is uploaded over an encrypted connection, processed on our servers and deleted automatically after a few hours. Nothing is shared, published or kept for training, and there is no sign-up or watermark. Because recordings are large, expect the upload to dominate the total time — that is the real limit on this job, not the encode.