Video
The complete video file hub. Tools and guides for MP4, MOV, AVI, MKV, WMV, WebM, and every major video format. Fix playback errors, understand codecs, and learn when to use each container format.
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Common Video Problems
Diagnose the issue, then fix it with the right tool.
Video File Too Large to Send by Email or Upload
Your video file is too large to attach to an email, upload to a form, or share on social media — you need to reduce its file size.
Video Cannot Play — Codec Not Supported or Missing
Your video player shows an error like "codec not found", "format not supported", or plays with no video/audio because the required codec is missing.
Video Plays But Has No Sound
Your video file plays back visually but there is no audio — either the audio track is missing, the codec is unsupported, or the volume is muted.
MKV File Not Playing on Windows — Codec Error Fix
MKV video files produce codec errors, play with no video, or do not open in Windows Media Player.
MOV File Not Playing on Windows — Fix QuickTime Error
MOV video files from iPhone or Mac show an error or play without video on Windows Media Player.
Video Thumbnail Shows Wrong Frame
The video file's preview thumbnail shows the wrong frame — a black frame, the last frame, or an unrelated still.
Audio Is Out of Sync With Video
The audio in a video file plays ahead of or behind the video — lips do not match what is being said.
Video File Is Too Large to Share or Upload
Your video file exceeds the upload limit for WhatsApp (16 MB), email (25 MB), or a web platform.
Video Has Picture But No Sound
A video file plays visually but there is no audio — the video track is fine but the audio track is silent or missing.
Deep-Dive Guides
Understand the why behind every fix.
How to Reduce Video File Size Without Losing Quality
Reduce a large video from gigabytes to hundreds of megabytes with no visible quality change, using the right codec and settings.
Best Video Format for YouTube, TikTok, and Social Media
Each social platform re-encodes your video regardless of format. Here is what to upload for the best output quality.
Video How-To Guides
Step-by-step walkthroughs for common video tasks.
How to Play MKV Files on a TV or Streaming Device
Stream or play MKV files on your smart TV, Chromecast, Roku, Firestick, or Apple TV without conversion.
How to Convert WMV to MP4 (Windows Media Video to Universal Format)
Convert legacy WMV files to universally compatible MP4 for sharing, uploading to YouTube, or playing on non-Windows devices.
How to Compress a Video Without Losing Quality
Reduce video file size for sharing, uploading, or storage while keeping the video looking sharp.
How to Convert MOV to MP4 (Free, No Quality Loss)
Convert MOV videos from iPhone, iMovie, or QuickTime to universally compatible MP4 format on Windows or Mac.
Video Comparisons
Side-by-side breakdowns to help you choose the right format or tool.
AVI vs MP4 — Legacy Format vs Modern Standard
AVI is a 1992 container with limited features. MP4 is the modern standard. Here is whether you need to convert your AVI files.
MKV vs MP4 — Flexible Container vs Universal Compatibility
MKV handles multiple audio tracks, subtitles, and chapters; MP4 works everywhere. Here is which to use for storage vs sharing.
MOV vs MP4 — Apple QuickTime vs Universal Standard
MOV is Apple's native video format; MP4 is the universal standard. Here is when each is the right choice.
Video File Formats
Detailed reference pages for every video format.
AVI (.avi)
Microsoft's Audio Video Interleave container from 1992. A legacy video format still widely used for storing uncompressed and DivX/Xvid-encoded video files.
MKV (.mkv)
Matroska Video container — the most versatile open-source video format. Supports unlimited audio/subtitle tracks, chapters, and any codec. Preferred for HD movie storage.
MOV (.mov)
Apple QuickTime Movie format. Native video container on macOS and iOS, used by iPhones, iMovie, and Final Cut Pro for high-quality video recording and editing.
MP4 (.mp4)
The universal video format — used for streaming, downloading, and sharing video content across all devices.
WebM (.webm)
Open-source web-optimised video format developed by Google. Uses VP8/VP9/AV1 video and Vorbis/Opus audio — royalty-free and natively supported by all modern browsers.
WMV (.wmv)
Windows Media Video — Microsoft's proprietary video format for Windows. Common in older Windows software and legacy corporate video archives.