Capcompress icon
Capcompress icon

Capcompress

Free browser tool for compressing, converting, and resizing bulk JPEG, PNG, WebP, and AVIF images entirely locally with WebAssembly, offering fast, private, unlimited processing, multi-core support, offline use, and ZIP export that keeps folder structure.

Screenshot of the landing page

Cost / License

  • Free
  • Proprietary

Application type

Platforms

  • Online
  • Software as a Service (SaaS)
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Features

Properties

  1.  Local-First
  2.  No AI

Features

  1.  Batch Editing
  2.  Live Preview
  3.  No registration required
  4.  Batch Rename Files
  5.  Ad-free
  6.  Hardware Accelerated
  7.  Built-in viewer
  8.  Image Conversion
  9.  Local Storage
  10.  Image Optimizer
  11.  Browser-based
  12.  Drag and Drop
  13.  File Compression
  14.  Batch processing

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Capcompress information

Capcompress was added to AlternativeTo by valanto on and this page was last updated .
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What is Capcompress?

Capcompress is a free web tool designed to optimize, compress, and convert your images at scale while guaranteeing absolute privacy. Unlike traditional cloud services like TinyPNG or single-image tools like Squoosh, Capcompress runs entirely locally on your device. Powered by WebAssembly, it processes your files directly in your browser at native speed. This means your images never leave your computer, and you can even use the app entirely offline once the page is loaded.

What truly sets Capcompress apart is its powerful bulk processing capability combined with zero restrictions. You can drag and drop entire folders containing hundreds of images, and the app will compress them in parallel using all your CPU cores. It then exports a neat ZIP file that perfectly preserves your original folder structure. There are no daily quotas, no file size limits, no watermarks, and no account required. Whether you need to bulk convert PNGs to next-gen formats like WebP and AVIF, or simply resize a massive batch of JPEGs without losing quality, Capcompress offers developers and designers a fast, private, and frictionless workflow.