How much can I compress a video?
Compression depends on the original video. Typically, you can achieve 30-70% size reduction with medium quality settings.
Tool Categories
Free Compress Video Online | 1ClickTools
Compress and reduce video file size while keeping quality. Free online video compressor — no upload, no watermark, runs in your browser.
Frequently Asked Questions
Will compression noticeably reduce quality?
With the High quality preset (CRF 23), quality loss is virtually imperceptible. Medium and Low presets trade more quality for smaller files.
What is CRF?
CRF (Constant Rate Factor) is a quality setting for H.264 encoding. Lower values mean higher quality (and larger files). Values 18-28 are typical.
Is my video uploaded to a server?
No. All compression happens locally in your browser using WebAssembly technology.
What formats are supported?
The compressor accepts MP4, WebM, MOV, AVI, and most common video formats.
How accurate is this compress video tool?
All processing runs entirely in your browser using verified algorithms. Results are computed with full double-precision — no server-side rounding or data transmission occurs.