Compress video files online — shrink MP4, MOV and WebM with a quality level you pick, and download a much smaller MP4.
AI-powered audio review & delivery for voice production teams
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Quality-level compression.
Want the math behind the numbers? See the Video Bitrate Calculator and Video File Size Calculator. Changing aspect ratio? Try the Aspect Ratio Calculator. Need the words from a clip? Use Video Transcription.
Upload a video, pick a level, and download a much smaller MP4
Compressing a video means re-encoding it: the tool decodes your file and writes a new one with a more efficient codec (H.264) and a quality target you set. The quality target is a number called CRF (Constant Rate Factor). A lower CRF keeps more detail and produces a larger file; a higher CRF throws away more of what the eye is least likely to notice, producing a smaller file. Because the encoder spends bits where they matter, a single pass at a sensible CRF usually shrinks a clip dramatically with no visible quality loss.
If the result is barely smaller, the file was probably already efficiently encoded — try Strong or step the resolution down.
The output is always an MP4 containing H.264 video and AAC audio. That combination plays everywhere — phones, browsers, editors, social platforms and messaging apps — with no extra codecs. It is also why this tool doubles as a quick way to convert WebM or MKV to MP4: feed in the less-compatible container and get a universal MP4 back.
Keeping the source resolution preserves the most detail. Stepping down to 1080p or 720p removes pixels before encoding, which compounds the savings — a 4K screen recording shrinks far more at 720p than CRF alone can manage. A practical rule: match the resolution to where the video will actually be watched. Phone and social feeds rarely need more than 1080p, and 720p is plenty for email or quick review copies. (Even with keep resolution, anything larger than 1080p is scaled down to fit within 1920px on the long edge so playback stays smooth.)
A browser tool like this wins when you have one file and want it smaller now: nothing to install, no encoder settings to learn, and it works the same on Windows, macOS, Linux, Chromebooks and phones.
HandBrake wins when you need to compress a whole folder of files in a batch, want fine-grained control over every encoder knob (two-pass, B-frames, custom audio tracks), or are working with files larger than the size and length limits here. Many people use both: this tool for the quick one-off, HandBrake for the big or repetitive jobs.
H.264 requires even pixel dimensions, so the tool always rounds width and height to even numbers — that is what keeps an odd-sized phone clip legal and playable. It also writes the file with +faststart, which moves the index to the front so the video can begin playing while it is still downloading instead of only after the whole file arrives.
Use Light or Balanced and keep the source resolution. These re-encode with H.264 at a high quality target (CRF), which removes data the eye barely registers — most clips come out much smaller with no visible difference. If you need it even smaller, try Strong or step down to 1080p/720p and compare.
Start with Balanced — it is the best size-to-quality trade-off for most footage. Choose Light when quality is the priority and the file just needs trimming, or Strong when you have to get under a tight size limit and can accept a little softness.
Without an account you can compress one file up to 100 MB and 5 minutes. A free account raises that to 200 MB and 10 minutes per file. The length cap keeps each compression fast, because the video is encoded while you wait.
MP4 with H.264 video and AAC audio is the most widely compatible format — it plays on phones, browsers, editors and social platforms without extra codecs. It also means you can drop in a WebM or MKV and use this tool to convert it to a universal MP4.
For a single file it is faster: nothing to install and it runs on any operating system. HandBrake is the better choice when you need to batch many files, tune every encoder setting, or compress files larger than the limits here. They complement each other.
No. The audio is re-encoded to AAC and kept in the file. If your source has no audio track, the output is simply a silent MP4 — compression still works normally.
VoiceDeck adds AI-powered audio & video review and delivery for your whole team — so every file ships in spec, automatically.
