Baseline JPEG Converter / EPUB Optimizer

This tool converts images in EPUB files to baseline JPEG format, optimized for XTEink X4 It runs entirely in your browser — no files are uploaded to any server.

• Convert PNG, GIF, WebP, BMP to baseline JPEG

• Smart scaling to 480×800 — dramatically reduces file size

• Grayscale conversion for e-ink displays

• Rotate & split wide images for vertical screens (CW, CCW and vertical splits can be chosen separately for every image with varying percentage of overlap)

• Fix SVG covers, images inside EPUB and metadata issues.

• Batch processing multiple EPUBs

Simple Mode - Default
Drop your EPUB, click Convert, download. Uses sensible defaults: 85% quality, grayscale ON. No configuration needed — perfect for quick conversions.

⚙️ Advanced Mode
Toggle to reveal all settings: quality slider, image selection grid, rotate & split options, overlap controls, and detailed conversion logs. Use when you need fine control.