Image Compression ▼
Image Conversion ▼
English ▼
Smart · Fast · No Upload
Drag files here or click to add
Supports JPG, JPEG compression
Auto

Free JPG compression with smart quality-size balance and real-time preview

All image processing is done locally in your browser via WebAssembly, ensuring privacy. Smart compression balances quality and size, supports batch processing, before/after comparison, and one-click download. Optimizes image loading and transfer efficiency for SEO, social media, email, and more.

  • What is JPG?

    JPG (or JPEG) is the most widely used lossy image compression format, standardized by the Joint Photographic Experts Group in 1992. It is natively supported by virtually all devices and platforms.

  • Why compress JPG?

    Oversized images slow page loading and consume storage and data. Proper compression improves load speeds, boosts SEO, and meets platform upload limits for smoother sharing and usage.

  • How does JPG compression work?

    JPG uses lossy compression, permanently removing some image data for smaller files. It converts colors into luminance and chrominance, splits the image into 8x8 pixel blocks, uses mathematical transforms to identify less important visual information, and discards data based on the chosen quality setting. MozJPEG uses smarter algorithms to optimize traditional JPG encoding, improving compression efficiency by 5-15% at the same visual quality.

  • Choose Quality Level?

    Use CaseQuality LevelCompression RatioNotes
    Archiving, professional photography90-10020-40%Preserves detail, skin tones, and lighting; ideal for print and original backups
    Web images, social media, email75-8950-70%Visually lossless, optimal for web loading
    Thumbnails, previews60-7470-85%Small display size, trades detail for speed
    Extreme compression, low-bandwidth, batch storageBelow 6085%+Works for large images; visible artifacts on small images

  • Privacy & Security?

    No registration required. All processing is done locally in your browser via WebAssembly. Images are never uploaded to the cloud, collected, or stored. Your privacy is fully protected.

  • How to Use?

    1
    Adjust QualityAuto by default, or set a custom quality value
    2
    Add FilesSelect, select all, or drag and drop to compress
    3
    DoneClick thumbnails to compare before/after
    4
    SaveSave individual images or download all