darken.video fixes video that came out too bright. Open a washed-out clip and press Auto fix, or pick Overexposed, Bright sunlight, Blown-out sky, Dim it down or Day for night; drag a split view to compare before and after and fine-tune exposure, highlights and blacks, then export an MP4 with the sound kept. Works on photos too. Nothing is sent off your device; free, no account, no watermark.
Overexposed phone and action-camera clips are hard to rescue without a full editor, and most quick apps upload the video or stamp a watermark. darken.video was built to bring back highlights and mood in a browser tab, free and private.