How much smaller will my video get?

It depends on the clip, but moving from a stock MP4 to WebM or animated WebP typically cuts the file to a small fraction of the original — often dramatically so for short, muted loops. Resizing to your real display width and trimming to the essential seconds shrinks it further still.

Should I compress to WebM or animated WebP?

Use WebM for anything with sound or longer than a few seconds — it's a true video format with audio support. Reach for animated WebP on short, silent loops like backgrounds, hover previews, or a GIF-style demo; it autoplays without a video player and is far lighter than a GIF.

Will compressing make my video look bad?

Not if you watch the quality slider. Both formats are efficient enough to hold detail at much smaller sizes, and you can re-export at a higher quality in seconds if a result looks soft. Slow-moving or muted footage compresses especially cleanly.

Can I compress a video to use as a website background?

Yes — it's one of the best uses. Mute the audio, trim to a clean loop, resize to the width of your section, and export an animated WebP or a small WebM. Both autoplay quietly and stay light enough not to drag down your page-speed scores.

Is it free, and what happens to my file?

It's completely free with no signup and no watermark; the free tier is funded by an optional one-time Pro upgrade and donations. You can upload an MP4, MOV, or WebM, and your file is processed on the server and removed automatically about an hour later — Pro accounts keep theirs permanently in a saved library.

Free online converter

Compress Video for Web to a Tiny WebM or Animated WebP

Drop media, a ZIP, or PNG frames

.mp4.mov.webm.gif.jpg.png.webp.heic.zip

Files up to 100 MB free · up to 1 GB with Pro

PNG sequence · Pro

A raw MP4 straight off your phone or screen recorder can be heavy enough to drag a whole page down — too big to drop into a hero section, a product card, or an email without your visitors watching a spinner. LightBox compresses it into a web-native WebM or animated WebP that looks the same but weighs a fraction as much.

Drag your clip in, then decide how aggressive to be: resize to the width you'll actually display, trim down to the few seconds that matter, ease off the frame rate on slow-moving footage, drop audio you don't need, and slide the quality until the size feels right. Muted background loops, demo reels, and short explainers shrink especially well.

There's no app to install and no account to create — and never a watermark. Your upload is processed on the server and deleted automatically about an hour later, so a quick compression job leaves nothing behind.

Dramatically smaller, still sharp

WebM and animated WebP are built for the modern web, so they pack the same motion into far smaller files than a stock MP4 or an old GIF. Your page loads faster and your visitors stop waiting — without the smeary, washed-out look heavy compression usually leaves behind.

You control the trade-off

Compression is a balance, so LightBox hands you the dials instead of forcing one preset on every clip. Match the resolution to where the clip will actually live, cut the footage down to what matters, ease the frame rate back on calm shots, drop audio you won't use, and nudge the quality slider until the size feels right. Don't like a result? Re-export in seconds.

Web-ready in seconds, nothing left behind

Upload, compress, download — no signup, no software, and never a watermark. Files convert in seconds and are wiped from the server automatically about an hour later. A one-time Pro upgrade keeps yours permanently in a saved library with reusable presets.

Free forever. Pro when you need more.

Everything on this page stays free. Pro adds this — once, no subscription, ever:

1 GB uploads, no daily limit
Batch convert + saved presets
Permanent library, priority processing

$54$2750% off

Launch price · once · yours for life14-day money-back guaranteeSee everything Pro adds

Frequently asked questions

More conversions

GIF to WebP MP4 to GIF WebM to GIF WebM to WebP WebM to MP4