YouTube, being the largest video-sharing platform, offers content creators a vast audience and unparalleled visibility. To make the most of this platform, understanding YouTube video size and its optimization is crucial.

We will explain the importance of YouTube video size, explore various formats, resolutions, and aspect ratios, and provide practical tips for optimizing YouTube video size to maximize visual impact.

YouTube Video Size

YouTube video size refers to the file size of your video content, which directly influences the video’s quality, streaming speed, and user experience. It is primarily determined by two factors: video resolution (dimensions measured in pixels) and file size (measured in bytes or kilobytes).

Understanding YouTube video size is crucial for content creators and uploaders as it directly impacts the video’s quality, loading times, compatibility, and viewer experience. It ensures smooth playback and prevents buffering issues, ultimately enhancing viewer satisfaction and engagement.

Factors Affecting YouTube Video Size

Several factors contribute to the overall YouTube video size. Understanding how each of these elements affects the file size is crucial for creating high-quality videos without compromising loading times.

Here are factors affecting YouTube video size:

  1. Video Resolution: The resolution of a video is the number of pixels in each dimension (width x height). Higher resolutions, such as 1080p (1920×1080) or 4K (3840×2160), contain more pixels and typically result in larger file sizes. Lower resolutions, like 480p (720×480) or 360p (640×360), have fewer pixels and lead to smaller file sizes.
  2. Video Duration: The length of the video also affects its size. Longer videos contain more frames and audio data, resulting in larger file sizes compared to shorter videos.
  3. Bitrate: Bitrate refers to the amount of data processed per second in the video file. Higher bitrates preserve more video details, leading to better quality but also larger file sizes. Lower bitrates reduce quality but result in smaller files.
  4. Codec and Compression: Video codecs (such as H.264, VP9) and compression techniques impact YouTube video size. Efficient codecs and compression algorithms can reduce file sizes while preserving video quality, whereas inefficient ones may inflate the video size.
  5. Frame Rate: The frame rate determines the number of individual frames displayed per second in the video. Higher frame rates (e.g., 60fps) require more data to be processed, leading to larger file sizes compared to lower frame rates (e.g., 30fps).
  6. Audio Quality: The audio component of the video also contributes to its overall size. Higher audio quality (bitrate and sample rate) increases the video’s size.
  7. Editing and Export Settings: The way a video is edited and exported can impact its final size. Some editing software allows users to control compression settings, which can affect the video’s file size.

YouTube Video Formats

Supported Video Formats on YouTube

YouTube supports various video formats, including MP4, AVI, MOV, and WMV. Each format has its own unique characteristics, impacting the video’s size and quality during the upload process.

Some of the supported video formats on YouTube include:

  1. MP4 (MPEG-4 Part 14): This is the most common and widely used video format on YouTube. It provides a good balance between video quality and file size, making it ideal for online streaming.
  2. MOV (QuickTime Movie): Developed by Apple, MOV files are also supported on YouTube. They are commonly used for videos created on Apple devices.
  3. AVI (Audio Video Interleave): AVI files are generally supported on YouTube, but some codecs used in AVI videos may not be compatible with the platform.
  4. WMV (Windows Media Video): YouTube also supports WMV files, which are commonly associated with Windows operating systems.
  5. FLV (Flash Video): While less common today, YouTube used to primarily use the FLV format in its early days. Many older videos on the platform are still in FLV format.
  6. MKV (Matroska Video): YouTube supports MKV files, but certain codecs used in MKV videos might not be compatible.
  7. WebM: YouTube actively encourages the use of the WebM format, as it is optimized for web use and provides good video quality with smaller file sizes.
  8. MPEGPS (MPEG Program Stream): This format is used less frequently, but it is still supported on YouTube.
  9. 3GPP (3rd Generation Partnership Project): Designed for mobile devices, 3GPP files are supported on YouTube.
  10. AVCHD (Advanced Video Codec High Definition): This format, commonly used in camcorders, is supported on YouTube.

Comparing Different Video Formats and Their Impact on Size

The choice of video format can significantly impact the file size of a video, even if the video content remains the same. Here’s a general comparison of the impact of different video formats on size:

Video FormatVideo CodecAudio CodecTypical File SizeImpact on Size compared to MP4 (H.264)
MP4H.264AACModerate to SmallStandard
MOVH.264AACModerate to LargeSlightly Larger
AVIVarious CodecsVarious CodecsLargeLarger
WebMVP9OpusSmall to ModeratePotentially Smaller
Please note that the file sizes can vary based on the video’s content, resolution, bitrate, and other factors.
  1. MP4 (H.264 codec): This format is widely recommended due to its good balance between video quality and file size. It provides relatively smaller file sizes compared to other formats like AVI or MOV, making it an efficient choice for YouTube uploads.
  2. AVI: AVI files tend to have larger file sizes compared to MP4 because they use different video codecs. This can result in longer upload times and increased bandwidth usage for viewers.
  3. MOV: Similar to AVI, MOV files can have larger file sizes compared to MP4. The size difference may not be as significant as AVI, but it’s worth considering when optimizing for YouTube.
  4. WMV: While WMV files are compressed, they can still have larger file sizes compared to MP4. Additionally, compatibility with YouTube may not always be guaranteed.
  5. FLV: FLV files are not as commonly used nowadays due to the prevalence of newer and more efficient formats like MP4 and WebM.
  6. WebM (VP9 codec): WebM with the VP9 video codec can offer smaller file sizes compared to MP4 with the H.264 codec, while maintaining similar video quality. This format is gaining popularity as an alternative for high-quality uploads.

Optimizing YouTube Video Size

To achieve the best balance between video quality and file size for optimal YouTube video uploads, it’s crucial to use the right format, resolution, and encoding settings.

A. Video Format

YouTube recommends using the MP4 (MPEG-4 Part 14) format for uploading videos. MP4 is one of the most commonly used video formats, as it provides a good balance between video quality and file size.

MP4 files are compatible with a wide range of devices and video players, making it an ideal choice for online streaming platforms like YouTube.

MP4 files can contain both video and audio streams, allowing you to combine these elements into a single file. This makes it convenient for YouTube’s video delivery system to handle and process your uploads.

B. Video Resolution

The video resolution refers to the number of pixels that make up the video’s display area. Higher resolutions result in clearer and more detailed videos, but they also lead to larger file sizes. YouTube supports a variety of resolutions, but for optimal quality, it’s best to upload videos in the highest resolution available for your content.

Common resolutions used on YouTube include:

  • 1080p (1920×1080): This is the standard resolution for high-definition (HD) videos. It provides excellent quality for most content types.
  • 1440p (2560×1440): Also known as 2K resolution, this option is ideal for videos that require higher visual fidelity, such as gaming content or videos with fine details.
  • 2160p (3840×2160 or 4K): This is the highest resolution supported on YouTube. 4K resolution is perfect for videos with ultra-high definition visuals, offering exceptional clarity and detail.

While higher resolutions offer better quality, they also require more bandwidth for streaming and may take longer to upload. Choose the resolution that best suits your content and your audience’s viewing capabilities.

C. Video Bitrate

Bitrate is the amount of data used to represent video per second. Higher bitrates result in better quality but also lead to larger file sizes. YouTube’s recommended video bitrates for optimal quality are as follows:

  • 1080p: 8 Mbps (Megabits per second): This is a good balance of quality and size for full HD videos.
  • 720p: 5 Mbps: Suitable for videos at 720p resolution, which is commonly used for online content.
  • 480p: 2.5 Mbps: Lower-quality videos or videos for slower internet connections can use this bitrate.
  • 360p: 1 Mbps: Minimal resolution for low-bandwidth situations or lower-quality videos.

These bitrates are just recommendations, and you can adjust them based on your specific needs. Higher bitrates will provide better quality, especially for fast-moving or complex scenes, but they will also result in larger file sizes.

D. Frame Rate

Frame rate represents the number of individual frames (images) displayed per second in the video. The standard frame rates supported by YouTube include 24, 30, and 60 frames per second (fps).

  • 24 fps: This frame rate is commonly used in filmmaking and provides a more cinematic and traditional look to videos.
  • 30 fps: This frame rate is widely used for online content and provides smooth motion suitable for most types of videos.
  • 60 fps: This higher frame rate is ideal for videos that involve fast motion or gaming content, as it offers smoother playback and better representation of motion.

The choice of frame rate depends on the type of content you’re creating. For most videos, 30 fps is sufficient and standard. However, if your content involves fast-paced action or gaming, consider using 60 fps for a smoother viewing experience.

E. Video Codec

A video codec is a software or hardware-based algorithm that compresses and decompresses digital video data. It determines how efficiently the video is compressed and affects both the video quality and file size. YouTube supports various video codecs, but the most commonly used and recommended codec is H.264 (also known as AVC – Advanced Video Codec).

H.264 is a widely adopted and highly efficient codec that provides excellent video quality at relatively low bitrates. It is compatible with a wide range of devices and browsers, making it an ideal choice for YouTube uploads.

In addition to H.264, YouTube also supports the newer H.265 (also known as HEVC – High-Efficiency Video Codec). H.265 offers even better compression and quality, allowing for smaller file sizes without sacrificing visual fidelity. However, not all devices and browsers may support H.265 playback, so it’s essential to consider the compatibility of your target audience.

F. Audio Codec

For the audio component of your video, YouTube recommends using the AAC-LC (Advanced Audio Codec – Low Complexity) format. AAC-LC offers good audio quality at lower bitrates, making it suitable for online streaming.

AAC is a widely supported audio format, compatible with most modern devices and browsers. Using AAC-LC ensures that your viewers will experience clear and high-quality audio while keeping the overall file size reasonable.

G. Audio Bitrate

The audio bitrate determines the amount of data used per second to represent the audio. YouTube’s recommended audio bitrate for optimal audio quality is 320 kbps (kilobits per second).

A bitrate of 320 kbps provides high-quality audio, but you can use lower bitrates, such as 128 kbps, for spoken content or videos where audio quality is not the primary focus. However, keep in mind that lower bitrates might result in a slight degradation in audio quality.

H. Container Format

The container format is the file format that holds together the video and audio streams, along with other metadata. YouTube’s recommended container format is MP4 (MPEG-4 Part 14), as mentioned earlier.

MP4 is a versatile container format that can store H.264 or H.265 video streams and AAC audio streams, making it perfect for YouTube uploads. By using MP4, you combine both video and audio into a single file, simplifying the upload and streaming process.

To summarize, to achieve the best format for optimal YouTube video size and quality, use the MP4 format with H.264 or H.265 video codec, AAC-LC audio codec, and follow the recommended resolutions and bitrates based on your content and target audience’s preferences.

Keep in mind that the ideal settings may vary depending on the content and type of video you are uploading. For example, videos with fast motion or lots of details might benefit from higher bitrates, while less complex videos may work well with lower bitrates.

Experiment with different settings and check the video’s quality before uploading it to YouTube to ensure you achieve the best results. Additionally, always check YouTube’s official documentation for any updates or changes to their recommended settings for video uploads.

YouTube Video Upload Tips

Maximum YouTube Video Size

The maximum YouTube video size depends on whether your account is verified or not. Here are the details:

  • Unverified Accounts: If your YouTube account has not been verified, you can only upload videos that are 15 minutes or less in length.
  • Verified Accounts: Verified accounts have more flexibility with the YouTube upload limit. Verified accounts can upload videos longer than 15 minutes, with a maximum video length of 12 hours. The maximum file size you can upload is 256 GB or 12 hours, whichever is less. It’s worth noting that YouTube may cut off videos that exceed 12 hours, even if they are longer, such as live streams.

It’s important to ensure that you are using an up-to-date version of your browser when uploading files greater than 20 GB. Additionally, compressing your video using video editing software can help if your video is larger than 256 GB.

Preparing Video Files for Upload


  1. Use High-Quality Source Footage: Start with the best possible source footage. High-resolution and high-bitrate videos will result in better quality uploads.
  2. Choose Supported Formats: Stick to commonly supported video formats like MP4, AVI, MOV, and MKV. These formats are widely accepted on most platforms and devices.
  3. Check Resolution and Aspect Ratio: Confirm the recommended resolution and aspect ratio for the platform where you’ll be uploading the video. Common resolutions are 720p (1280×720) and 1080p (1920×1080).
  4. Optimize Video Compression: Compress your video without sacrificing too much quality. Use modern codecs like H.264 or H.265 to achieve a good balance between file size and video quality.
  5. Trim and Edit Videos: Trim unnecessary footage and edit the video to ensure it’s concise and engaging. Shorter videos are often preferred by viewers.
  6. Add Captions and Subtitles: If applicable, include captions or subtitles to make your video more accessible and improve its reach.
  7. Audio Quality Matters: Ensure your video’s audio is clear and well-balanced. Avoid background noise and use a separate audio track if needed.
  8. Test the Video Playback: Before uploading, play the video on different devices and platforms to ensure it looks and sounds as intended.
  9. Upload a Thumbnail: Most platforms allow you to upload a custom thumbnail image. Choose an eye-catching thumbnail that represents your video content.
  10. Comply with Copyright Rules: Use royalty-free or licensed content in your videos to avoid copyright violations. If using copyrighted material, ensure you have the necessary permissions.


  1. Don’t Use Unstable Footage: Avoid shaky or unstable footage as it can be distracting and negatively impact the viewer’s experience.
  2. Avoid Extremely Large Files: While high-quality videos are essential, excessively large file sizes can lead to long upload times and may deter viewers with slow internet connections.
  3. Don’t Use Unsupported Formats: Stay away from obscure video formats that might not play properly on all devices or platforms.
  4. Don’t Overuse Special Effects: Overusing visual effects can make your video appear unprofessional. Use them sparingly and purposefully.
  5. Avoid Poorly Timed Transitions: Ensure smooth transitions between scenes and shots. Poorly timed transitions can disrupt the flow of your video.
  6. Don’t Neglect Video SEO: Pay attention to video titles, descriptions, and tags to optimize search engine discoverability.
  7. Avoid Overcomplicating Visuals: Keep your video visually engaging, but avoid overwhelming the audience with excessive graphics or cluttered visuals.
  8. Don’t Mislead Viewers: Be honest in your video’s content and title. Misleading viewers can lead to negative feedback and decreased trust.
  9. Avoid Copyrighted Music Without Permission: Using copyrighted music without proper authorization can result in copyright strikes and video takedowns.
  10. Don’t Rush the Upload Process: Take the time to follow the best practices for video preparation to ensure a positive viewer experience.


By choosing the right video format, resolution, aspect ratio, and employing efficient compression techniques, creators can strike the perfect balance between YouTube video size and video quality.

Following best practices for uploading and adhering to YouTube’s guidelines will further elevate your content’s appeal, providing viewers with an enjoyable and immersive experience. If you want to know about Instagram Post Size, File Formats and Compression Tips, Please read here.


Why is YouTube video size optimization crucial for content creators?

YouTube video size optimization is crucial as it directly impacts video quality, loading times, and viewer engagement. Well-optimized videos lead to a smoother viewing experience, reducing the risk of buffering issues and keeping viewers invested in your content.

Does increasing video resolution always result in better visual quality?

While higher resolutions can enhance visual clarity, they also lead to larger file sizes. Creators should consider their audience’s devices and the content type when deciding on the optimal resolution.

What are the best practices for video compression to minimize file size?

To minimize file size without compromising quality, creators should use modern compression techniques, adjust bit rates, and utilize appropriate codecs. Proper compression ensures a smaller video size while maintaining visual appeal.

How can content creators ensure they meet YouTube’s video dimension guidelines?

To meet YouTube’s dimension guidelines, creators must set their video dimensions to match the recommended aspect ratio and resolution, ensuring the content displays correctly across various devices.


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