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Video Processing: Compress Video Size Online Free, Reduce/Shrink Video Size Online to Smaller (MP4, AVI, MPEG)

Compress video size online with best free online video compressors. Detailed guide on how to reduce video file size without losing quality.

Q: I record some stunning 4K videos with my new DJI drone and want to share onto my social media accounts like YouTube, Facebook. Is there a recommended video reducer program that can help me compress the video size online for free without affecting the image quality?

Large video files not only occupy much storage space of your devices, but also are not easy to transfer, upload, or share. Compressing video size online free is a way out. This post lists some reliable ways to allow you to reduce video size online for free with least quality loss. Check the top online video compressors and detailed guide on how to shrink video size with best quality.

Reduce/Compress Video File Size to Smaller Without Best Quality

WinX HD Video Converter Deluxe - Best video size compressor to reduce file size of HD/4K/8K videos (MKV, M2TS, AVCHD, HEVC, etc.) or large AVI, H.264, MP4,MPEG, WMV or other videos to save storage, play on mobile devices, share online, send via email, etc.

>> Part 1: Best Free Online Video Size Compressors
>> Part 2: What Video Parameters Affect Video Size?
>> Part 3: How to Compress Video Size with WinX HD Video Converter Deluxe

Reduce Video File Size

When You Need to Compress Video Size

1. Reduce video file size for uploading videos to YouTube, Facebook, Vimeo, Instagram or other online video sharing websites.

2. Compress a video to embed into email to share with friends.

3. Compress a video to transfer to iPhone, Android or other mobiles, saving space in storage devices.

4. The movies, videos occupy too much space of your computer. Reduce the video file size to free up space of computer.

5. Compress recorded large camcorder/drone 4K/HD videos to share online.

Best Free Online Video Size Compressors

1. VideoSmaller (

Features: VideoSmaller is a free online video compressing service that allows you to downsize video file online free, compress video file size online free to make video file smaller with least quality loss. Reduce MP4/AVI/MPEG/MOV video size. Select the video file from computer and click "Upload Video" button to shrink video size.

Pros: Simple operation.
Cons: Only support MP4, AVI, MPEG, MOV video formats. The video uploading speed is a little slow. The input maximum video size is 500MB. Lack many other video editing features.
Sometimes it can't compress the video size, in the contrast, make the output video larger than the original video. For instance, I upload a source 3.9M video but it outputs a 4.8M video.

2. Clipchamp Free Online Video Compressor (

Features: A top free video size reducer program lets users to compress a wide range of videos, optimize and balance video output quality and file size compression, save compressed video files to computer or upload straight to YouTube, Facebook, Google Drive and Vimeo.

Pros: No input file size limits. Popular input video formats are included.
Cons: Need to sign up with Email before you can use the program. Besides, the basic free version only allows you to compress 5 videos per month and 5 min/video Webcam Recordings, while the full version costs $7.5/month or $90/year. Output formats are limited to: MP4, WebM, ASF, WMV, and FLV.

What Video Parameters Affect Video Size?

Video bit rate: Bit rate is the most important factor which determines the video size. The higher the bit rate, the larger the video file size and the better the video quality. If you want to reduce the video file size, you can drop the video bit rate to a degree while keeping the video quality in an accepted level.

Video codec: Codec is another factor affecting video size. Using different video codec to encode a video will output videos with different sizes. E.g., H.265/HEVC is more superior to H.264 in regards to video quality, size and compression rate. To put it much clearer, to get the same video quality, H.265 encodes a more compressed video that is about half the size of H.264, at only half the bit rate.

Video format, resolution & frame rate:
Video format/container doesn't affect video size. For instance, MKV (H.264) is not likely larger than MP4 (H.264).
Only changing video resolution but not changing the video bit rate isn't likely to improve the video quality.
Frame rate (image frames per second) can affect video quality and video smoothness. Normally 24-30 fps is recommended, and it's not advised to change it to shrink video size.

A formula helps you better understand their relationships:
Video size = video time * bit rate
1 bit = fps * resolution
E.g. A video is 100 minutes (6000s), its bit rate is 174kbps, then its video size is: 6000s * 174kbps = 1024*1024kb (1GB)

Alternative Way: Compress Video Size with WinX HD Video Converter Deluxe

Actually, for privacy concern, it is advised to use a top standalone video compressor program instead of an online video compressor to reduce video size.

WinX HD Video Converter Deluxe is a 100% clean and secure top video compressor and reducer program, offering many modes to compress the video size. It is also a professional video converter & video downloader for Windows (10).

1. Freely change video codec, resolution, bit rate, frame rate, aspect ratio, etc. to balance the video quality and video size. Numerous video codecs like H.265, H.264 are offered.

2. Easily edit videos. Trim video part, crop video frame, add external subtitles, etc.

3. No input and output limits. 8K/4K/1080p/720p videos are supported. Convert almost all videos from one format to another incl. MKV, HEVC, M2TS, AVCHD, MOD, camcorders/drones videos, MP4, AVI, MPEG, WMV, MOV, VOB, FLV and more. 370+ video & audio codecs, 420+ preset devices profiles are provided.

4. Free download 8K/4K/1080p/720p or other resolution movies, videos, MP3 songs from YouTube and 1000+ online sites.

5. Fully utilize Intel QSV, Nvidia CUDA/NVENC hardware acceleration to deliver ultrafast video processing speed.

Purchase benefits: Lifetime full license and free upgrade. 30-day money back guarantee. Time-limited: $49.95 Now only $35.95 (save $14)

How to Compress Video Size While Keeping Best Quality

Reduce Video File Size

Free download and install WinX HD Video Converter Deluxe on Windows 10/8/7, and follow the guide below to learn how to compress video size without sacrificing much quality.

Open WinX HD Video Converter Deluxe and click "+Video" button to import the source video file. Then choose a preferred output video format according to your needs by browsing the Output Profile column. MP4 is supported by most media players and devices.

Method 1 – Reduce Video Bit Rate, Resolution, Frame Rate

Click the wheel-like Settings button to freely adjust the video/audio parameters. Choose "VBR" to freely set video bit rate value. It's not recommended to lower the bit rate too much to compress the video size because it will affect the quality. You can also choose to reduce the video frame rate, resolution based on your needs.

Cut Video Clips to Reduce Video File Size

Method 2– Change Video Codec

You can also choose a much compressed video codec to encode the output video. For example, in regards to compression ratio, HEVC/H.265 > H.264 > DivX.

Method 3 – Trim, crop unwanted parts

Click "Edit" icon to open the video editing window. Click "Trim" to cut unnecessary part of the video to get your wanted clips by setting Start Time and End Time or directly drag the slide bar. Tap "Crop & Expand" to freely crop the video image frames.

When everything is settled, you can tick "Hardware Encoder" Intel or Nvidia hardware acceleration (if your computer supports) to speed up the video processing speed at most. Then hit "RUN" to start compressing video size for later uploading the video onto social video sharing sites like YouTube, Facebook, Vimeo, or email to friends, etc.

Still have trouble on how to reduce video file size, just Mail Us >>

WinX HD Video Converter Deluxe - All-in-One Video Resizer and Converter

Compress video size, trim video clips, remove black borders, change aspect ratio, adjust bit rate, etc.
Convert videos among MP4, MKV, HEVC, H.264, AVI, WMV, MPEG, MOV, etc. Compress Gopro/drone videos.
Free download 8K/4K/1080p/720p videos, movies, MP3 songs from YouTube, Dailymotion, Vevo, and 1000+ sites.
No.1 fast video converter supporting hardware acceleration (Intel QSV & Nvidia CUDA/NVENC).

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