01
Video Converter
Converts between MP4, WebM, MKV, MOV and AVI in your browser, so an unplayable file becomes…
Video Compressor
Shrinks a video so it fits an email or a WhatsApp limit, re-encoding with H.264 in your browser. Nothing is uploaded.
Video & Audio
Nothing uploaded
No sign-up
Free, unlimited
Drop a video hereor click to choose — the file never leaves your device
Add a file to begin.
In short
Video Compressor is a free online tool on inputtesthub.com that shrinks a video so it fits an email or a WhatsApp limit, re-encoding with H.264 in your browser. Nothing is uploaded. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Video Compressor
- Add your PDF file or files by dropping them in.
- Arrange or configure them as needed.
- Download the finished PDF. Processing happens on your own device.
About the Video Compressor
The Video Compressor shrinks a video so it fits an email or a WhatsApp limit, re-encoding with H.264 in your browser. Nothing is uploaded. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Getting a clip under an email or WhatsApp attachment limit.
- Reducing a screen recording before sharing it.
- Saving space on a phone full of video.
Details
| Codec | H.264 (libx264) with AAC audio |
|---|---|
| Quality scale | CRF 18 (near-lossless) to 40 (small and soft) |
| Default | CRF 28, a good balance for sharing |
The first tool you run downloads the 31 MB WebAssembly engine once; after that it starts instantly. Processing speed depends on your own machine — a browser build is several times slower than desktop FFmpeg, so a long 4K file will take a while. The trade is that nothing is uploaded and nothing is queued behind other people.
Frequently asked questions
What quality setting should I use?
Start at the default. CRF 23 looks close to the original and roughly halves the size; 28 is a good sharing balance; above 34 the picture visibly softens. Lowering the width is often more effective than raising CRF — a 4K clip scaled to 1080p drops enormously with no visible loss on a phone.
Is my video uploaded to a server?
No. FFmpeg is compiled to WebAssembly and runs inside this browser tab, on your own processor. You can watch the Network tab while it works — no request carries your file. That is also why there is no queue, no size cap set by us and no watermark.
Why is the first run slow to start?
It downloads the 31 MB engine once. Your browser caches it, so every later run on this site starts immediately. The processing itself is unaffected.
How big a file can I use?
There is no limit we impose — the ceiling is how much memory your browser will hand the tab, typically 2–4 GB on desktop and much less on a phone. If a very large file fails, try trimming it first or use a lower output resolution.
Why is it slower than a desktop program?
WebAssembly runs at roughly half to a third of native speed, and this build is single-threaded because the multi-threaded one needs security headers that would break other parts of the site. For a short clip the difference is seconds; for a feature-length 4K file, use a desktop tool.
Is the Video Compressor free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is the Video Compressor safe to use with private information?
No. The Video Compressor runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
When would I actually need the Video Compressor?
The jobs it is built for: getting a clip under an email or WhatsApp attachment limit. Reducing a screen recording before sharing it. Saving space on a phone full of video. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
The first tool you run downloads the 31 MB WebAssembly engine once; after that it starts instantly. Processing speed depends on your own machine — a browser build is several times slower than desktop FFmpeg, so a long 4K file will take a while. The trade is that nothing is uploaded and nothing is queued behind other people.
Which values should I know?
Codec is H.264 (libx264) with AAC audio. Quality scale is CRF 18 (near-lossless) to 40 (small and soft). Default is CRF 28, a good balance for sharing. These are printed on the page itself, so you do not have to take them on trust.
Is there a file size limit?
There is no limit set by us, because your file is never uploaded — the only ceiling is the memory your own browser will give the tab. Very large files simply take longer to process, and a phone will give up sooner than a desktop.
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