Image Filters and Effects

No. All filtering runs in your browser on the raw pixel buffer. The image never leaves your device, so private photos stay private, and nothing is sent to a server.

Yes. The preview uses the exact same pixel math as the export, just on a copy scaled to fit 900 pixels on the long edge for speed. The downloaded file is processed at full resolution with identical settings.

Each pixel is converted with Rec. 601 luma, which weights red at 0.299, green at 0.587, and blue at 0.114. That matches how the eye perceives brightness, so a pure red (255, 0, 0) becomes 76, not 85 as a flat average would give.

Brightness first, then contrast, then saturation, then the discrete effects grayscale, sepia, and invert in that sequence. Order matters, so inverting after a sepia looks different from sepia after an invert.

Each slider runs from -100 to +100. Brightness is additive, where +100 adds a full 255 to every channel before clamping. Saturation of -100 removes all color, 0 leaves it unchanged, and +100 doubles the distance from gray.

Only if you choose to. You can export as PNG, which is lossless, or as JPEG or WebP, which are lossy and expose a quality slider, regardless of the input format.

Yes for formats that support it. The alpha channel is never touched by the filters. Exporting a transparent PNG or WebP preserves transparency, while JPEG has no alpha and fills it in.

Each channel is clamped to the 0 to 255 range after every step. Push brightness or contrast far enough and values pile up at 0 or 255, which clips shadows or highlights to solid black or white. Ease the slider back to recover detail.

You can open a GIF, but only the first frame is decoded and filtered. The result is a single still image, not an animation.