Perfect Screensavers for Your E-Reader

Convert any image into beautifully optimized covers for Kindle, Kobo, and other e-ink devices. Automatic greyscale conversion, dithering, and perfect sizing.

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How It Works

Everything you need to create perfect e-reader screensavers

E-ink Optimized

Greyscale conversion, Floyd-Steinberg dithering, and quantization tuned specifically for e-ink displays.

Device Presets

Pre-configured settings for Kindle, Kobo, reMarkable, and more. Create custom presets for any device.

Fine-Tuned Control

Adjust brightness, contrast, gamma, sharpening, and crop settings per image for perfect results.

100% Private

Runs entirely in your browser using WebAssembly. Your images never leave your device.

Batch Processing

Drop multiple images at once and download them all as a convenient ZIP archive.

Real-time Preview

Compare original and processed images side-by-side with an interactive slider.

Optimized for E-ink

E-ink displays work differently than regular screens. Here's how we optimize your images for the best results.

Dithering Simulates More Shades

E-ink displays typically only show 16 grey levels. Without dithering, gradients appear as harsh bands. Dithering uses patterns of dots to simulate smooth transitions, making images look natural on limited displays.

We support Floyd-Steinberg (smooth, natural) and Atkinson (higher contrast, retro) algorithms.

{#each [2, 4, 16] as levels}

{levels} levels

{/each}

Grey Levels Match Your Device

Different e-readers support different numbers of grey levels. Basic Kindles show 16 levels, while premium displays may show 256. We quantize your images to match your device's capabilities.

More levels = smoother gradients, but dithering can make even 16 levels look great.

Perfect Sizing for Sharp Results

E-ink displays render at their native resolution. Images that don't match get scaled by the device, often poorly. We resize your images to exactly match your e-reader's screen dimensions.

Choose from cover (fill screen, crop edges) or contain (fit entirely, may letterbox) modes.

Wrong size

Perfect fit

Convert Your Images

Drop your images below and download optimized screensavers

Device

Pipeline

{#if imagesStore.hasImages}

Images ({imagesStore.images.length})

View:

{#if imagesStore.completeCount > 0} {/if}

{:else}

No images yet. Drop some images above to get started.

{/if}