Compress Video Online — Private, Free, No Upload
Shrink any video under a target file size, entirely in your browser. Powered by FFmpeg WebAssembly — your file never leaves your device. No watermark, no sign-up, no file-size tricks.
Popular workflows
Compress for Discord
Fit short clips under a 10MB sharing target.
Compress for Email
Shrink videos toward a 25MB attachment workflow.
5MB Video Compressor
Reduce a video to 5MB or less for strict upload limits.
Compress for Outlook
Make a smaller video for an Outlook email attachment.
WhatsApp Video Compressor
Reduce video size for faster WhatsApp sharing.
Compress Video Without Losing Quality
Shrink files with a quality-first browser preset.
Video to GIF
Make a short, high-quality GIF with no upload.
Screen Recording to GIF
Create readable GIFs for issues, docs, and demos.
Compress Without Uploading
A private workflow for sensitive videos.
Bug Report GIF Guide
Recommended settings for GitHub, Jira, and Notion.
Compress for a specific platform
Compress to a target size
Compress by type & quality
Why in-browser compression is different
Most online video compressors upload your file to a server, process it there, and make you download the result. That means waiting through two large transfers and trusting a third party with your footage. This tool runs FFmpeg — the same engine professionals use — compiled to WebAssembly inside your browser. Nothing is uploaded, there is no queue, and confidential videos stay on your machine.
How target-size compression works
Enter a target size and the tool computes a video bitrate budget from your clip's duration: total bit budget = size ÷ length, minus a fixed audio allocation and container overhead. The encoder aims below that budget and can retry with a corrected bitrate if the first output is still too large.
Need a private workflow?
Read the step-by-step guide on how to compress a video without uploading it, or turn a short clip into a shareable loop with the private video to GIF converter, or browse all VidSlim guides.