About Aback Images

Why it exists

Most online image tools upload your photos to a server, process them there and send them back. That is slow, it puts private photos (with their GPS location and camera serial numbers) on someone else's computer, and it usually comes with limits, queues and watermarks.

Modern browsers are powerful enough to do this work locally. Aback Images ships the processing engine to your browser instead: proper codecs compiled to WebAssembly, background threads for speed, and small AI models that run on your own hardware.

What is inside

• Codecs from Google's Squoosh project: MozJPEG, OxiPNG, libwebp, libavif and libjxl, plus high-quality resampling filters.
• Custom decoders and encoders for BMP, ICO/CUR, TGA, QOI, PNM, DDS, HDR, APNG, animated WebP and camera RAW previews.
• pdf.js and pdf-lib for PDFs, UTIF for TIFF, ag-psd for Photoshop files, libheif for HEIC.
• ONNX Runtime Web with U²-Net and IS-Net segmentation models, UltraFace for face detection, and Tesseract for OCR.

Principles

• Privacy first. No uploads, ever, for any tool.
• Honest results. We say when a conversion loses transparency or animation, when an output is lossy, and when we kept your original because it was already smaller.
• Quality by measurement. Target sizes and smart optimisation use real encode-and-measure loops and SSIM, not guesses.