压缩器 v1.0

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

Settings

Compression

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Compress JPEG images online.

This tool compresses JPEG images using Mozilla's mozJPEG encoder — the same technology that powers Firefox's image rendering. JPEG is ideal for photographs and complex images with smooth gradients, like portraits, landscapes, and product shots.

A typical 8-megapixel JPEG photo from a modern smartphone is 4-6 MB. Compressed at quality 80, the same image becomes 200-600 KB — a 90% reduction — with no visible difference at normal viewing distances.

Key features

  • mozJPEG encoder for smaller files at equivalent quality
  • Lossless mode strips metadata and optimizes without pixel changes
  • Target-size mode hits exact file sizes automatically
  • Parallel batch processing — unlimited files at once
  • Progressive JPEG support for gradual image loading

How to compress jpeg — step by step

  1. Drop your JPEG: Drag and drop one or more JPEG images onto the upload area, or click to browse your files.
  2. Adjust compression settings: Use the quality slider (1-100), enable target-size mode, or switch to lossless mode to preserve every pixel.
  3. Preview the result: Drag the side-by-side comparison slider to verify quality. The compressor shows original and compressed file sizes.
  4. Download your compressed JPEG: 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.

Compress JPEG

Frequently Asked Questions

  • How much can you compress a JPEG?

    A typical JPEG can be reduced by 40-80% without visible quality loss. Our compressor uses Mozilla's mozJPEG encoder, which produces smaller files than standard JPEG at the same quality setting.

  • Does JPEG compression lose quality?

    JPEG is a lossy format by design — every re-encode discards some data. At quality settings above 80 the visual difference from the original is imperceptible at normal viewing sizes.

  • Can I compress a JPEG without losing quality?

    Yes, use Lossless mode which re-encodes without recompressing the image data. This reduces file size by stripping metadata and optimizing Huffman tables, saving 5-15%.

  • What is the best JPEG quality setting?

    Quality 75-85 is the sweet spot for web use: excellent compression with no visible loss. Quality 50-60 is usable for thumbnails and backgrounds.

  • Can I batch compress JPEG files?

    Yes. Drop an entire folder of JPEGs and the queue processes them in parallel using all available CPU cores. No hard limit on quantity — compress as many JPEGs as you need, each up to 100 MB.