Vidsembly
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Video Compressor

Shrink video files directly in your browser. Upload one clip or a batch, pick a compression preset and max resolution, then download smaller MP4 files individually or as a ZIP. Your footage stays on your device. Free to use with no account or card needed.

Drop video files here

Bulk upload supported · H.264 MP4 export · ZIP download

Compression preset

Choose how aggressively to re-encode video and audio for a smaller MP4.

Max long edge

Downscale tall or wide videos before encoding to cut file size without changing the aspect ratio.

  • Free to use
  • No account required
  • Files stay in your browser
  • H.264 MP4 output
  • Bulk export + ZIP

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Frequently asked questions

How do I compress a video online?
Upload one or more video files, choose a compression preset and a max long edge, then click Compress videos. When processing finishes, download each MP4 individually or use Download All to get a ZIP archive.
Is this video compressor free?
Yes. This tool is completely free with no account, card, watermark, or desktop software install required.
Are my videos uploaded to a server?
No. Compression runs locally in your browser using FFmpeg compiled to WebAssembly. Your source videos and exported MP4s are not sent to Vidsembly or any third-party server.
Which video formats can I compress?
You can compress common formats such as MP4, MOV, WebM, AVI, MKV, and M4V. Each output is an H.264 MP4 file with a -compressed suffix added to the filename.
What does max long edge do?
It downscales the video so the longest side does not exceed 1920px, 1280px, or 720px while keeping the aspect ratio. Lowering resolution often saves more space than bitrate tweaks alone, especially for screen recordings and 4K camera exports.
Which compression preset should I use?
Balanced works for most sharing and LMS uploads. Choose Smaller file when you need to stay under a strict megabyte cap. Choose Higher quality when you are sending a client preview or keeping a review copy before final edits.
Can I compress multiple videos at once?
Yes. Add several videos before compressing, apply one preset and max long edge to the batch, then download finished MP4 files individually or package them together as a ZIP.

About this tool

When to compress video before upload

Email attachments, Slack uploads, form builders, and course platforms often enforce file size limits. Compressing video before you upload keeps handoffs fast, reduces buffering for viewers on cellular data, and helps you stay inside portal caps without re-editing the project.

Resolution and bitrate work together

A 4K screen recording may be far larger than viewers need on a laptop. Downscaling to a 1280px or 1920px long edge, then re-encoding with a sensible CRF preset, usually beats lowering quality on the original pixel dimensions alone.

H.264 MP4 for broad playback

This compressor exports MP4 with H.264 video and AAC audio, a pairing that plays across Windows, macOS, Android, and most web players. The faststart flag helps playback begin sooner while the file is still downloading.

Screen recordings and talking-head clips

Tutorial captures and webinar recordings often contain long static segments. Smaller file presets and a 1280px long edge are practical defaults for review links, while Higher quality preserves text edges when you are sharing UI walkthroughs with stakeholders.

Private browser-based compression

Draft ads, unreleased lessons, and internal recordings can be sensitive. This video compressor runs in your browser so you can create smaller MP4 copies without routing footage through an unknown upload queue.

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