How to download only part of a long video
It's one of those things almost nobody realises is possible: downloading only a slice of a video, without fetching the rest. The usual way round it is to download the whole file and trim it afterwards in an editor — and to keep one minute of a two-hour talk, that means fetching an enormous file in order to throw away 98% of it.
How can it not download everything?
Videos on the internet aren't served as one indivisible block. They're delivered in parts, and the protocol allows asking for a specific range instead of the whole file: it's the same thing your player does when you jump to minute 40 of a video and it starts playing in a second, without having downloaded the previous 39.
Building on that, marking a start and an end requests only that interval. A 20-second section of a two-hour video takes seconds and weighs what 20 seconds weigh.
What it saves in practice
| Original video | What you want | Downloading all of it | Requesting the section |
|---|---|---|---|
| 2 h talk at 1080p | 1 minute | ~6 GB | ~50 MB |
| 3 h livestream | A 30 s play | ~9 GB | ~25 MB |
| 20 min tutorial | The step at minute 12 | ~1 GB | ~50 MB |
The figures are indicative — they depend on the actual bitrate — but that's the order of magnitude: from gigabytes to tens of megabytes. To sharpen the maths for your own case, it's laid out in how big a video is.
How to do it
- Copy the video link and paste it into trim a YouTube video.
- Mark the start and the end. The preview shows you the frame at each edge, so you aren't going blind on numbers.
- Choose whether you want it as an MP4 video or as a GIF.
- Download: what arrives is only that section.
When it ISN'T worth it
Worth being honest about the limits. If you're going to need several different sections of the same video, you're better off downloading it once and cutting locally: each section is a fresh request. And if you want to archive the video for good, download it whole — the section is a partial copy, and you won't get back what you left out without returning to the source, which can disappear.
The side effect nobody mentions
Trimming doesn't only save download time: it also improves the quality of what you share. When a video won't fit in a chat or an email, the normal reaction is to compress it, and compressing spreads the same data across the whole runtime. If only ten seconds actually matter, sending those ten seconds untouched looks far better than the whole video squeezed. We go into it in trim or compress?.
You can also cut from TikTok or Instagram, and if you want the full video, there's the downloader.
Frequently asked questions
Does it really not download the whole video?
It doesn't. Only the interval you marked is requested, taking advantage of the fact that videos are served in parts. That's why a 20-second cut from a two-hour video takes seconds: there's nothing more to fetch.
How precisely can I choose the section?
To the second. You set the start and the end and see the length of the section before downloading. For a frame-accurate cut on a file already on your disk, that's in the converter with Premium.
Can I do it with a finished livestream?
Yes, and that's where it shows most: on a multi-hour broadcast, requesting a section saves downloading gigabytes to keep one play. If you want the whole recording, see downloading a YouTube livestream.
Does the section lose quality?
Not relative to the original: the slice arrives at the same quality that stretch would have inside the full video. The only thing that loses quality is the GIF, because that format uses a very limited colour palette and carries no sound.
Can I download several sections of the same video?
Yes, by repeating the operation with a different start and end. If you're going to need many, consider downloading the video once and cutting locally: each section is a fresh request.
Use our free tool — no sign-up required.
Go to YouTube Downloader
Daniel Carter
Technical writer · PullVid team
Daniel writes about video downloading, formats, and web tools at PullVid.
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