brighten.video

The evening was great, the video of it less so. You open the clip later and the room that felt bright enough is a murky shadow on screen. The usual rescue is to open a full editor and hunt for an exposure slider. brighten.video narrows that to one button. Auto brighten measures the light in your clip and lifts it to a natural level, and a Before and after view lets you compare the two before saving anything.

The team behind it says fixing a dark clip normally means a desktop editor with exposure curves, or a mobile app that adds a watermark or wants a subscription. Theirs is free and works in your browser.

If the automatic result isn't right, four quick fixes aim at common problems: Night video, Dim room, Backlit and Slightly dark. A Strength slider sets how far each one goes. Backlit is the one for a person filmed in front of a window or bright sky.

More options opens the full set. You get exposure in stops along with shadows, highlights and midtones. Black and white points, contrast, saturation and vibrance are there too, plus noise reduction, a histogram and a waveform. There's a short guide to reading the histogram: a tall spike against the left edge means crushed shadows, and one against the right means blown highlights.

Photos work the same way. Drop in a JPEG, PNG, WebP or iPhone HEIC picture and you get the same tools, with Export photo saving a full-size copy that leaves out location, camera and date details.

Brightening has limits, and the site is upfront about them. Pixels recorded as pure black carry no detail at all, and no software can invent it. Lifting deep shadows always reveals some noise, which is why noise reduction is there. Very dark footage already holds sensor noise and compression blocks, so brightening can make it look grainy, and noise reduction can't invent detail. Brightening also changes every pixel, so the video has to be decoded and encoded again. In the site's words, no tool can brighten a video losslessly.

It's free, with no account, watermark or length limit. MP4, MOV, WebM and MKV files open, including footage from iPhone and Android phones. The privacy page, updated November 6, 2026, starts from a fair point. Dark footage is often personal, such as a party, a night out or the inside of someone's home, so the tool is built so the site never sees it. Your browser opens the file and brightens it on your device. No person or company is named as the operator.

If you've got a dim clip sitting on your phone, drop it in and press Auto brighten to see how much comes back.