Drop an MP4 file here to compress
MP4 · up to 500 MB · smaller file, good quality
Select one MP4 file to compress and make it smaller
Select one MP4 file to compress and make it smaller
How to Compress an MP4 Online
Add an MP4 video from your device, or drag and drop it into the upload area to start compressing your MP4 online.
Keep Auto optimize turned on for automatic MP4 compression, or turn it off to choose Target file size and make the MP4 smaller for Discord, LINE, Gmail, WhatsApp, Slack, and more.
Click Compress to reduce the MP4 file size. Everything runs locally in your browser, so your video is never uploaded to a server. Download the compressed MP4 when it is ready.
Why Use UploadLess MP4 Compressor
Private MP4 compression
Compress MP4 files directly in your browser. Your video stays on your device and is never uploaded to a server.
Fast and free to use
Open the MP4 compressor and start right away. No account, no sign-up, and no watermark.
Auto optimize by default
Let UploadLess automatically reduce MP4 file size with balanced settings for everyday sharing.
Target any file size
Turn off Auto optimize to choose a custom target size or use quick tags for Discord, LINE, Gmail, WhatsApp, Slack, and more.
MP4 Compressor FAQ
Add your MP4 video, keep Auto optimize turned on, and click Compress. UploadLess will reduce the MP4 file size directly in your browser without uploading the video to a server.
Yes. UploadLess is a free online MP4 compressor. You can compress MP4 videos without creating an account, installing software, or adding a watermark.
No. MP4 compression runs locally in your browser using WebAssembly technology. Your video stays on your device and is never uploaded to our server.
Yes. You can make an MP4 smaller for Gmail, Discord, LINE, WhatsApp, Slack, and other platforms. Turn off Auto optimize to choose Target file size or use a quick size tag.
Auto optimize is the default mode. It automatically chooses balanced compression settings to reduce MP4 file size while keeping the video quality suitable for everyday sharing.
Yes. Turn off Auto optimize to use Target file size mode. You can enter a custom size or select a preset tag for common platforms like Discord, LINE, Gmail, WhatsApp, and Slack.
Usually, some quality reduction is expected when making an MP4 file smaller. Auto optimize is designed to balance file size and quality, so the compressed MP4 still looks good for most everyday uses.
You can compress MP4 videos up to 500 MB. For larger files, consider trimming the video first or using a desktop video compressor.