Load, crop, resize, adjust, annotate, redact and export images entirely on the user's device, from strongly typed C#. No server round trips, no base64, no JavaScript image library.
dotnet add package Bit.Bmage.Editor
That runs in the browser. The original file never leaves it, the phone's rotation is applied, the GPS coordinates are stripped, and the result is a WebP that fits the size budget you asked for.
var result = await processor.ProcessAsync( uploadedFile, ImagePipeline.Create() .AutoOrient() .Cover(512, 512) .Sharpen(0.3f), new ImageExportOptions { Format = ImageFormat.WebP, Quality = 0.82, Metadata = MetadataPolicy.StripSensitive, MaxFileSize = 120 * 1024, });The resampler, the rasteriser, the colour pipeline, the TrueType text engine and the PNG, JPEG, BMP and GIF codecs are implemented in the library. The browser is used for what only it can do: WebP and AVIF, the clipboard, the camera, and drawing pixels on screen.
Everything in the box:
Six decisions run through the whole library. Every card links to the page that shows the decision paying off.
An edit is a list of operations, not a mutated buffer. Undo costs a few hundred bytes, previews are cheap, and any earlier step can be changed.
The resampler, rasteriser, colour engine and four codecs are implemented in the library. The browser is used only for WebP and AVIF.
Editing runs on a proxy sized for the display and replays at full resolution on export, so a 24 megapixel photo does not stall the UI.
Metadata is removed unless you ask for it. GPS coordinates never leak into an exported avatar by accident.
Format support is probed by encoding a pixel. When AVIF is unavailable you are told, not silently handed a PNG.
Every capability works without the editor component, so the same pipeline runs in an upload handler or a console tool.
16 pages, in the order they are meant to be read. Press Ctrl K anywhere on the site to jump straight to one.
Bmage is part of bit platform, free and open source. The whole engine lives in the repository, so you can read it, file an issue against it, or send a pull request.