Video Downloader Glossary
50+ terms explained simply — codecs, containers, quality, formats, DRM, subtitles, and more. Every term you need to understand video downloading in 2026.
Video Quality & Resolution
1080p (Full HD)
A video resolution of 1920×1080 pixels, the most common HD standard. Most YouTube and TikTok content is available in 1080p. It offers a good balance of quality and file size for mobile and desktop viewing.
4K (2160p / Ultra HD)
A video resolution of 3840×2160 pixels — four times the detail of 1080p. YouTube and Vimeo offer 4K on many videos. 4K files are significantly larger (often 1-3 GB for a 5-minute video).
8K (4320p)
A video resolution of 7680×4320 pixels — the highest quality available on YouTube. Very few devices can display 8K natively, and file sizes can exceed 5 GB for short clips. Downloads require fast internet and significant storage.
720p (HD)
A video resolution of 1280×720 pixels. Often used for mobile streaming to save data. Downloads at 720p are typically 30-60 MB for a 5-minute video.Download 720p YouTube videos →
Bitrate
The amount of data processed per second of video, measured in kbps or Mbps. Higher bitrate means better quality but larger file size. YouTube typically uses 8-50 Mbps for 1080p-4K content.
Frame Rate (FPS)
The number of images displayed per second. Standard is 30fps; 60fps is common for gaming; 24fps is cinematic. Higher FPS means smoother motion but larger files.
SD (Standard Definition)
Video resolution of 480p or lower (typically 640×480). Rarely used today except for legacy content. Downloads are very small (10-20 MB for 5 minutes).
Video Codecs
Codec
Software that compresses and decompresses video. Common codecs include H.264, H.265, AV1, and VP9. The codec determines quality, file size, and device compatibility.
H.264 (AVC)
The most widely supported video codec — works on virtually every device, browser, and player. YouTube uses H.264 for 720p-1080p downloads. Best choice for guaranteed compatibility.Download H.264 YouTube videos →
H.265 (HEVC)
A newer codec that offers 50% better compression than H.264, but licensing restrictions limit browser support. Common on Apple devices and for 4K Blu-ray.
AV1
The newest open-source video codec (by the Alliance for Open Media). 30% more efficient than VP9. YouTube increasingly uses AV1 for 4K and 8K. Most 2020+ devices support it in hardware.
VP9
Google's open-source video codec, used for YouTube 4K and 8K content before AV1. Supported by Chrome, Firefox, and Android. Not supported on older Safari versions.
Container Formats
MP4
The most universal video container format. Works on all devices, browsers, and players. Combines H.264 video with AAC audio. Best for downloads meant to be shared or played anywhere.
MKV (Matroska)
A flexible container that can hold multiple audio tracks, subtitles, and video codecs. Common for high-quality movie downloads and anime. Supported by VLC, MPV, and most desktop players (not Safari).
WebM
An open container format designed for the web, optimized for VP8/VP9/AV1 codecs. Used by YouTube. Smaller than MP4 but less compatible with media players.
MOV
Apple's container format, used by QuickTime and iPhones. High quality but large file size. Can contain H.264 or H.265 video.
FLV (Flash Video)
A legacy Adobe Flash format, now obsolete. Some older YouTube content still uses FLV. Modern downloaders convert FLV to MP4 automatically.See our downloader tools →
Audio Formats
MP3
The most popular audio format. Compressed lossy audio at 128-320 kbps. Compatible with every device. Use when you only need audio from a video (music, podcasts, interviews).Convert YouTube to MP3 →
M4A
An audio container using AAC codec. Better quality than MP3 at the same bitrate. Used by iTunes and Apple Music. Compatible with most modern players.
AAC (Advanced Audio Coding)
The standard audio codec for YouTube, TikTok, and Instagram. Better compression than MP3. Typically 128-256 kbps for downloaded videos.
Opus
An open audio codec used by YouTube for WebM/Opus audio streams. Better quality than AAC at low bitrates. The default audio format when downloading high-quality YouTube content.
Lossless
Audio compressed without any quality loss (FLAC, ALAC, WAV). File sizes are 5-10× larger than MP3. Rare for video downloads — usually for music production or archival.
Lossy
Audio compressed by discarding inaudible data (MP3, AAC, Opus). Reduces file size at the cost of some quality. Standard for video downloads.
Downloading Concepts
Watermark
A logo, username, or platform branding overlaid on a video. TikTok, Instagram Reels, and Snapchat add watermarks to downloads. Our downloader removes watermarks for clean, share-ready files.Download TikTok without watermark →
No-Watermark Download
Downloading a video without the platform's branding overlay. Essential for repurposing content on other platforms. Our TikTok downloader uses API methods that skip watermark injection.Try TikTok no-watermark download →
Direct Download
Downloading a video file directly to your device without going through a separate streaming server. Faster than screen recording and preserves original quality.See all direct download tools →
Batch Download
Downloading multiple videos at once (entire playlists or channels). Useful for archiving or offline access. YouTube playlist downloads require all video URLs to be processed sequentially.
Playlist Download
Downloading every video in a YouTube playlist at once. The downloader fetches the playlist metadata, then iterates through each video. File sizes can be very large (10+ GB for 100 videos).
Region Lock (Geo-Restriction)
When a video is only available in certain countries. YouTube, TikTok, and streaming platforms enforce this via IP detection. Our downloader routes requests through the server's location, which may bypass some restrictions.
Streaming & DRM
DASH (Dynamic Adaptive Streaming over HTTP)
YouTube's streaming protocol. Video and audio are split into separate streams and merged during download. This is why downloaded YouTube videos need ffmpeg merging.Download YouTube videos (DASH-supported) →
HLS (HTTP Live Streaming)
Apple's streaming protocol using segmented `.m3u8` playlists with `.ts` segments. Used by Twitch, Dailymotion, and most iOS platforms. Downloads require segment concatenation.
DRM (Digital Rights Management)
Encryption that prevents unauthorized copying. Used by Netflix, Disney+, Hulu, Spotify. DRM-protected content cannot be downloaded with standard tools — it requires decryption keys.See why Spotify is DRM-blocked →
Widevine
Google's DRM system used by Chrome and Android. Protects content from Netflix, YouTube Premium, and others. Three levels: L1 (hardware), L2 (software), L3 (fallback).
FairPlay
Apple's DRM system for Safari, iOS, and tvOS. Protects Apple Music, Apple TV+, and licensed content. Most difficult DRM to bypass for downloading.
Subtitles & Transcripts
SRT (SubRip Subtitle)
The most common subtitle file format. Plain text with timestamps. Compatible with all video players. Can be downloaded separately or merged into video files.Download YouTube transcripts as SRT →
VTT (WebVTT)
The W3C standard subtitle format for the web. Similar to SRT but supports styling and positioning. YouTube uses VTT for its subtitle tracks.
Transcript
A text version of a video's spoken content. Transcripts are useful for accessibility, SEO, content repurposing, and AI training. YouTube auto-generates transcripts for most videos.Download YouTube transcripts →
Closed Captions (CC)
Subtitles that can be toggled on/off. YouTube provides auto-generated captions in many languages. Some videos have professionally authored captions with sound descriptions.
Hardsubs (Burned-in Subtitles)
Subtitles permanently rendered into the video pixels — cannot be toggled off. Common in anime and foreign films. The subtitles are part of the video file itself.
Platform-Specific Terms
Reel
Instagram's short-form video format (up to 90 seconds). Competes with TikTok. Reels use vertical 9:16 format and can be downloaded without watermark using our tool.Download Instagram Reels →
Short
YouTube's short-form video format (up to 60 seconds), vertically oriented. Competing with TikTok. Shorts are available in the main YouTube app and can be downloaded via our YouTube downloader.Download YouTube Shorts →
Story
Ephemeral content on Instagram, Facebook, Snapchat, and WhatsApp that disappears after 24 hours. Stories are time-sensitive — download before they expire.Download Snapchat Stories →
Spotlight
Snapchat's short-form video tab, similar to TikTok's For You feed. Spotlight videos can be downloaded without Snapchat branding using our tool.Download Snapchat Spotlight videos →
Fleek
A short-form video format on some social platforms. Usually refers to content that looks exceptionally good ("on fleek").
Carousel
A multi-image or mixed-media post format on Instagram and LinkedIn. Carousels can contain photos, videos, or a mix. LinkedIn carousels can include PDF documents.
Channel
A YouTube creator's page containing all their uploaded videos. You can download individual videos or entire channels (via playlist URLs).
Tools & Software
yt-dlp
The open-source command-line video downloader we use on our backend. Supports 1000+ sites, auto-fetches best quality, and handles cookies for private content. The successor to youtube-dl.
ffmpeg
The industry-standard multimedia processing tool. Used to merge separate video and audio streams (DASH), convert formats, extract audio, and add/subtract subtitles. Our backend processes all downloads through ffmpeg.
Online Downloader
A web-based video downloading tool that requires no software installation. Visit a URL, paste your link, and download. Our tools at TechEvangelistSEO run entirely in the browser — no downloads required.Browse all free tools →
yt-dlp Cookie File
A text file containing login session cookies that yt-dlp uses to access age-restricted or members-only content. Our server stores cookies securely for supported platforms.
PO Token
A proof-of-origin token YouTube requires for some protected videos. Our backend uses a dedicated PO token server to ensure downloads work reliably.
Image Formats
Thumbnail
The preview image shown for a video before playback. YouTube thumbnails are 1280×720 JPG. Our tool extracts the original high-resolution thumbnail alongside the video.Download YouTube thumbnails →
WebP
A modern image format developed by Google. 30% smaller than JPG at the same quality. Used for YouTube and TikTok thumbnails. Supported by all modern browsers.
AVIF
The newest image format, based on the AV1 video codec. 50% smaller than JPG. Supported by Chrome, Firefox, and Android. Not yet supported by older Safari versions.
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Last Updated: July 8, 2026 · Maintained by TechEvangelistSEO