Original video preview
View the uploaded video, duration, resolution, and source file size before applying a compression preset to the current clip.
Compress Video
Upload a video, choose a compression level, compare the original and compressed previews, and download a smaller MP4 for sharing or upload.
High Quality preserves detail; Maximum Compression is for uploads where size matters most.
Compare both previews to catch softened text, artifacts, or audio problems before download.
- Reduce MP4 file size in the browser
- Compare original and compressed previews
- Download a compressed MP4
How to use Compress Video
Compress a video by uploading the source file, choosing the level that fits your destination, then checking the preview and file size before download.
- 1
Upload the source video
Choose the video you want to make smaller and wait for the preview metadata to load. Check the source size, resolution, and duration before starting compression.
- 2
Pick a compression preset
Select High Quality, Balanced, High Compression, or Maximum Compression based on whether you need sharper detail or the smallest practical upload size for this upload.
- 3
Review compressed video file
Run compression, compare the compressed preview with the original, check the percentage saved, then download the MP4 only if the quality still works for your upload.
Compressed preview
The result panel shows the compressed MP4 with its new size and reduction percentage, so quality checks happen before download.
H.264 MP4 output
The export uses H.264 video, AAC audio, and fast-start MP4 settings for broad playback support after compression finishes.
Quality presets
Four CRF-based presets give quick control over the tradeoff between visible quality, audio bitrate, and final file size.
Browser processing
Compression runs from the open page with progress feedback, so closing the tab or refreshing stops the active job.
Downloadable result
Save the compressed file with a clear filename and test it in the platform where you plan to upload or send it.
Compress Video privacy and processing
Compress Video keeps the working source, selected preset, preview, and compressed result in the active browser session. Download the MP4 before refreshing because the page is not permanent storage.
Processing Browser
Compress Video loads the source file in the browser, applies an H.264 MP4 compression preset, and shows the compressed result before download.
Storage Local
The source preview, selected preset, and compressed object URL live in the current tab until you download, switch files, or refresh.
Compress Video account access
You can reduce video file size without signing in, although daily usage limits can apply before the compression job starts.
Before You Use Compress Video
Review these notes before reducing video size, especially when the clip contains small text, fast movement, private footage, or audio that must stay clear.
Privacy
Check the video for faces, screens, names, locations, or client material before creating a smaller version that may be easier to share.
Keep the original file available until the compressed version has been approved or uploaded to the intended destination.
Accuracy
Every meaningful size reduction can reduce quality, especially around text, fast motion, dark scenes, and fine detail.
Compare the original and compressed previews before download rather than judging only from the file size percentage.
Compatibility
The output is MP4, but the browser still needs to read the source video and load FFmpeg successfully before compression can start.
If a preset looks too soft, rerun with Balanced or High Quality instead of using the smallest file automatically.
Output
Open the downloaded MP4 and check playback, audio, captions burned into the video, and small on-screen text.
If your destination has a file-size cap, leave room below the cap because some platforms reprocess video after upload.
Limits
Compress Video runs FFmpeg in the browser; large source files, high resolutions, and stronger quality settings can take longer to process.
Daily operation limits apply when compression runs, and the final file size depends on source quality, motion, resolution, audio, and the selected CRF preset.
Questions about Compress Video
How can I reduce video file size online?
Upload the video, choose a compression preset, run the browser compressor, compare the result, and download the smaller MP4 after previewing it.
Which compression preset should I choose?
Use Balanced for most uploads, High Quality when text or detail matters, and High or Maximum Compression when you need the file to be much smaller.
Does Compress Video require an account?
No account is required for the normal page, but daily compression limits can apply before the browser compression job runs successfully.
Will compression reduce video quality?
Usually, yes. Stronger compression can soften detail or add artifacts, so preview the compressed result and pick a higher-quality preset when needed.
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