MP4 Compressor — Compress & Convert Video Online Free
Shrink large clips with a free MP4 compressor that also works as a video compressor and lightweight video converter. Upload MP4, MOV, M4V, or WebM, choose compression quality and max resolution, then download a smaller MP4 ready for Instagram Reels, TikTok, YouTube Shorts, email, or messaging — all processed locally in your browser with no cloud upload.
How to use this tool
- Open the MP4 compressor and upload your video (MP4, MOV, M4V, or WebM).
- Pick a compression quality: high, balanced, small file, or max compress.
- Optionally cap resolution at 1080p, 720p, or 480p to reduce size further.
- Click Prepare compression to build the preview, then download the compressed MP4.
- Use the smaller file for posts, shares, or as a video converter step before editing.
Frequently asked questions
- Is this an MP4 compressor or a full video converter?
- Both. It is primarily an MP4 compressor / video compressor that re-encodes footage to a smaller MP4. It also acts as a simple video converter when your source is MOV, M4V, or WebM and you need an MP4 download.
- Will compressing reduce video quality?
- Lower quality presets use a smaller bitrate and may downscale resolution, which reduces file size and can soften detail. Start with Balanced and move to Small or Max compress only if you need a much smaller file.
- Do I upload my video to a server?
- No. Compression runs in your browser. Your file stays on your device during processing.
- What formats can I compress?
- Upload MP4, MOV, M4V, or WebM. The export is always a compressed MP4 suitable for social platforms.
- Can I compress video for Instagram Reels or TikTok?
- Yes. Use Balanced or Small with 1080p or 720p max for a lighter upload that still looks good on mobile feeds.