Image Editor

BrainCoder's image editor is a canvas editor that runs entirely in this browser tab. Open a PNG, JPEG, GIF, WebP or BMP file and you can crop it, rotate it in 90° steps, mirror it, resize it by a uniform percentage, adjust brightness, contrast and saturation, apply a filter, draw on it, and download the result as PNG, JPEG or WebP. The image is decoded and edited on your device and is never uploaded, so a passport photo, a client deliverable or a screenshot of something private stays on your machine.

The operations are exact rather than approximate. Rotation, mirroring and cropping move pixels: nothing is resampled, nothing softens, and a crop you set is stored in the image's own coordinates so it survives a later rotation or mirror. Resizing is the one operation that resamples, and it is the browser's own resampler — enlarging interpolates between the pixels you already have and cannot invent detail. That is not an AI upscaler, and this tool does not pretend to be one. One scale is applied to both axes, so an image is never stretched or squashed by a resize.

Adjustments and filters are computed per pixel in this tab, after the resize and before the annotations, and are baked into the downloaded file rather than being a view-only effect. Annotations — brush, line, rectangle, arrow and text — are recorded in the image's own coordinates, so a stroke you draw now is still in the same place after a later crop, rotation or resize, and it is stored in the file's output pixels so a thin stroke exports thin. They are also baked into the same single canvas the file is written from, so there is nothing to re-order, re-select or move afterwards, and no PSD to save.

The caps are stated rather than hidden, and every one of them refuses instead of quietly adjusting your image: 25 MB per input file, 16 megapixels and 8192 px per side on the output, an 8 px minimum on a side, and a 10%–400% scale range. An export that would not fit is refused with the largest scale that would, and the file you get back is the file that was measured. The format is read from the file's own header bytes, so a file that only claims to be a PNG is rejected before a decoder is handed it.

What this editor is not, in full: there are no layers, no PSD, no selection or healing tools, no AI, and no HEIC, AVIF or RAW support. Every download is encoded again from the pixels on screen, so re-exporting an untouched JPEG is a second lossy generation — PNG is the only lossless choice here. JPEG has no transparency, so transparent pixels are composited on white. The browser applies a photo's EXIF orientation flag on the way in and nothing else is carried out, so no camera, GPS, timestamp or ICC profile survives, and a wide-gamut photo can shift slightly in untagged sRGB. GIF and animated WebP arrive as their first frame only, and an animated file loses every frame after it.