Compresor v1.0

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  • JPG
  • PNG
  • WebP
  • AVIF
  • GIF
  • SVG
  • HEIC

Settings

Compression

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Compress images online — free and fast.

ToolBox Image Compressor is a fast, browser-based tool that compresses JPEG, PNG, WebP, AVIF, and more — all without uploading your files to any server. Processing happens locally on your device using WebAssembly-optimized encoders.

Whether you need to shrink a single photo for email, compress a batch of product images for your e-commerce store, or hit an exact file size for a platform limit, our compressor gives you the tools you need with full control over quality and output format.

Key features

  • All formats: JPEG, PNG, WebP, AVIF, GIF, HEIC, TIFF
  • Lossy and lossless compression modes
  • Target-size mode for exact file size requirements
  • Parallel batch processing — unlimited files
  • Side-by-side comparison preview

How to image compressor — step by step

  1. Drop your images: Drag and drop one or more images onto the upload area, or click to browse your files. Supports JPEG, PNG, WebP, AVIF, and more.
  2. Adjust settings: Use the quality slider, enable target-size mode for exact file sizes, or switch to lossless mode. Choose your output format.
  3. Preview the result: Drag the side-by-side comparison slider to verify quality. See original and compressed file sizes side by side.
  4. Download: Save individual files or download all compressed images as a ZIP archive. Your files never left your device.

Common use cases

Whether you are a photographer, web developer, e-commerce manager, or social media creator, optimizing images before publishing saves bandwidth, improves page load times, and ensures compatibility with platform-specific requirements. Our browser-based compressor works with all major image formats and processes everything locally for your browser with no uploads.

Need to convert images between formats? Try our Image Converter. To resize images for any platform, use the Image Resizer. For rotation and flipping, check the Image Rotator. To crop images with preset aspect ratios, use the Image Cropper.

Image Compressor

Frequently Asked Questions

  • What is the best image compressor?

    The best image compressor is one that works locally in your browser, supports all major formats, and gives you full control over quality. ToolBox Image Compressor does all of this — no uploads, no limits, no sign-up.

  • Can I compress images without losing quality?

    Yes. Use lossless mode for PNG and WebP to preserve every pixel. For JPEG, quality 80+ is visually lossless on normal displays. Our side-by-side comparison slider lets you verify quality before downloading.

  • What image formats are supported?

    Our compressor accepts JPEG, PNG, WebP, AVIF, GIF, SVG, HEIC, and TIFF as input. Output formats include optimized JPEG, PNG, WebP, and AVIF.

  • Is this image compressor really free?

    Yes, completely free. No sign-up, no credit card, no usage limits, no hidden charges. All processing runs locally on your device — we never see your files.

  • How many images can I compress at once?

    No hard limit — compress as many images as your device can handle. Each file up to 100 MB. The queue processes all files in parallel using all available CPU cores.