Zeraku
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🌐 Runs in Browser⏱ Est. Instant – 5 seconds

Bildkomprimierung

Bilder bis zu 90% verkleinern ohne sichtbaren Qualitätsverlust

Try It Now — Free

What is Bildkomprimierung?

Compress JPEG, PNG, WebP, and GIF images directly in your browser. Adjust quality, compare before/after, and download compressed files instantly. Batch compress up to 20 images at once.

Key Features

Compress JPEG, PNG, WebP, and GIF

Adjustable quality slider (1–100)

Side-by-side before/after comparison

Batch compress up to 20 images

Shows compression ratio and savings in KB/MB

Smart auto-quality that targets minimal visual loss

Download individual files or all as ZIP

Preserves or strips EXIF metadata on demand

How It Works

1

Drop Your Images

Drag up to 20 images onto the upload zone, or click to browse.

2

Adjust Settings

Use the quality slider or let the smart auto mode choose the best compression for each image.

3

Preview & Compare

Instantly see compressed previews alongside the originals with file size deltas.

4

Download

Download each compressed image individually or all at once as a ZIP.

Who Is This For?

  • →Web developers optimizing page load times
  • →Bloggers reducing image sizes before upload
  • →E-commerce teams maintaining product image quality at low file size
  • →Email marketers reducing attachment sizes

Why Use Bildkomprimierung?

TinyPNG and Squoosh are popular, but TinyPNG uploads your images to a remote server and applies server-side compression, while Squoosh handles one file at a time. Zeraku's Image Compressor processes up to 20 images simultaneously in parallel Web Workers — all inside your browser, with no server upload. Faster batch processing, complete privacy, and no file-count limits per month.

How Zeraku Compares to Popular Image Compressors

TinyPNG uploads your images to a remote server. Squoosh handles one file at a time. Zeraku compresses up to 20 images in parallel, entirely in your browser.

ZerakuTinyPNGSquoosh
Completely free✓Unlimited△Up to 500/month✓
Privacy (no server upload)✓Browser-only✗Server upload✓Browser-only
Batch processing✓Up to 20 at once✓Up to 20✗One at a time
Account required✗Not required△Free plan available✗Not required
PNG lossy (pngquant)✓pngquant WASM✓✓
Supported formatsJPEG/PNG/WebP/GIFJPEG/PNG/WebPJPEG/PNG/WebP/AVIF

Beginner's Guide

Image compression reduces the file size of photos without making them look visibly worse. Smaller images load faster on websites, take less storage space, and are easier to share. To use this tool: drag your images onto the page (JPEG, PNG, WebP, or GIF), adjust the quality slider to balance size and quality, then download the compressed files. You can process up to 20 images at once. The original files are never changed — you always get a brand-new compressed copy.

Technical Details

JPEG and WebP compression use the browser's native canvas.toBlob() API with a configurable quality parameter (0–1). PNG compression uses a two-stage pipeline: lossy palette reduction via a WASM-compiled build of pngquant (Floyd–Steinberg dithering, configurable quality range), followed by lossless deflate optimisation via oxipng. GIF frames are extracted, compressed individually, and re-assembled. All compression jobs run in parallel Web Workers — one worker per file — so batch jobs scale with the device's CPU core count. The original file is never modified; compressed output is generated as a new Blob and offered for download via an object URL.

Frequently Asked Questions

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