How to use it
Choose a photo, then tap a filter for a quick look, or move the sliders yourself. A filter only sets the sliders, so you can pick one and then fine-tune it. Press and hold Hold to compare to see the original while your finger or mouse is down; let go to see your changes again. Reset puts every slider back to zero, and double-clicking a slider resets just that one. When it looks right, choose a format and press Download the picture. The preview is a smaller copy so the sliders stay quick; the saved file is made again from your full-size photo.
What the sliders do
Brightness lightens or darkens everything. Contrast pulls darks and lights apart, or brings them closer for a flat, faded look. Highlights and Shadows change only the bright or dark parts: lift the shadows to see into a dark corner, pull the highlights down to bring back a bright sky. Saturation makes colors stronger or quieter. Warmth moves the colors toward orange or blue, and Tint toward pink or green, which fixes photos taken under odd indoor light. Vignette darkens the edges to draw the eye to the middle. Soften or sharpen adds a light blur or crisps up edges. Black and white, Sepia and Invert colors do what they say.
Tips
Small changes look the most natural: try 10 to 20 before going further. Fix the light first (brightness, shadows, highlights), then the color. Too much sharpening makes halos around edges, so check it at full size. For the smallest file, save as JPG or WebP; use PNG when you need every pixel exact.
Questions
Is my picture uploaded? No. The changes are worked out by your browser on your device, and the photo never leaves it. Only your format and quality choice is remembered. Does it keep the full resolution? Yes, up to 24 megapixels; bigger pictures are scaled down to that so the browser doesn’t run out of memory. Can I open an iPhone HEIC photo? Browsers can’t open HEIC; share it as JPG first, or use the Image Converter. Is the photo’s location kept? No. The saved file is a fresh picture, so camera details and location from the original aren’t copied into it.