Compress JPG Online

Reduce JPEG file size by up to 80% with adjustable quality. Perfect for web, email, and social media. Free, no signup.

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Supports M4A, WAV, FLAC, OGG, AAC, WMA, AIFF, OPUS • Max 100 MB

Encrypted upload via HTTPS. Files auto-deleted from our servers within 2 hours.

How to Compress a JPG Image

1

Upload JPG

Drag and drop your JPG or JPEG image into the tool above, or click to browse. Supports files up to 100 MB.

2

Choose Quality

Select a compression level: Low (60) for maximum size reduction, Good (80) for the best balance, or Very High (92) for near-lossless output.

3

Download

Click Compress & Download and get your smaller JPG. The result shows exactly how many bytes you saved.

How JPEG Compression Works

JPEG compression uses a multi-step process to reduce file size by discarding visual data the human eye is least sensitive to:

  1. Color space conversion — the image is converted from RGB to YCbCr, separating brightness (luma) from color (chroma). Human vision is more sensitive to brightness than color, so chroma channels can be compressed more aggressively.
  2. Block splitting — the image is divided into 8×8 pixel blocks. Each block is processed independently.
  3. Discrete Cosine Transform (DCT) — each block is transformed from pixel values into frequency components. Low frequencies represent gradual color changes; high frequencies represent sharp edges and fine detail.
  4. Quantization — this is where the actual compression happens. High-frequency components (fine details) are rounded down or eliminated based on the quality setting. Lower quality = more aggressive quantization = smaller files.
  5. Huffman coding — the remaining data is encoded using variable-length codes, similar to ZIP compression, for the final size reduction.

At quality 80, most of the discarded data is in high-frequency details that the human eye can barely perceive — which is why the image looks virtually identical to the original.

Quality Levels Guide

Quality Size Reduction Visual Quality Best For
95 5–15% Indistinguishable from original Print, archival, photography portfolios
90 15–25% Near-original, no visible artifacts High-quality web, e-commerce product photos
85 30–40% Excellent — differences only visible at 400% zoom Hero images, blog cover photos, detailed graphics
80 40–50% Visually identical for most images General web use, blog posts. Recommended default.
70 55–65% Minimal difference, slight softening Social media, email attachments, thumbnails
60 70–80% Visible artifacts on detailed areas Previews, placeholders, images where size matters most

Pro tip: Quality 80 is the sweet spot — visually identical to the original with 60–70% file size reduction. Most professional web developers use this setting as their default.

Compress JPG for Web

Google PageSpeed Insights and Lighthouse penalize pages with oversized images. Here are recommended JPG sizes for common web elements:

Image Type Target Size Quality Dimensions
Hero / Banner Under 300 KB 80–85 1920×1080 or smaller
Blog Post Image Under 200 KB 80 1200×800 or smaller
Product Photo Under 250 KB 85 1000×1000 or smaller
Thumbnail Under 50 KB 75 300×300 or smaller
Social Media OG Image Under 300 KB 80 1200×630

Keeping images under these thresholds can improve your Lighthouse Performance score by 10–20 points. Compress first, then resize if the image is larger than needed using our Resize Image tool.

Compress JPG for Email

Email providers impose attachment size limits that can prevent your images from being delivered:

  • Gmail — 25 MB total attachment size
  • Outlook / Hotmail — 20 MB total attachment size
  • Yahoo Mail — 25 MB total attachment size
  • Apple iCloud Mail — 20 MB total attachment size

A single uncompressed photo from a modern smartphone is 5–12 MB. Compress at quality 70–80 to reduce each image to 500 KB–2 MB without visible quality loss. This lets you attach 10–20 photos in a single email instead of 2–3.

For sharing many photos, compress each to quality 75 and consider resizing to 1920×1080 or smaller — recipients rarely need the full 48 MP resolution of modern phone cameras.

Frequently Asked Questions

JPG compression is lossy, so some data is discarded. However, at quality 80–92, the difference is virtually invisible to the human eye while reducing file size by 20–50%. At quality 60–75, you may notice slight softening on detailed areas, but the file size reduction is 50–80%. Quality 80 is the recommended default for most use cases.
Typical savings: Quality 92 saves 10–20%, Quality 85 saves 30–40%, Quality 80 saves 40–50%, Quality 75 saves 50–60%, Quality 60 saves 70–80%. Actual results depend on image content — photos with lots of fine detail compress differently than simple graphics. After compression, we show the exact size reduction as a percentage.
Quality 80 is the sweet spot for most use cases — visually identical to the original with 40–50% file size reduction. For hero images and photography portfolios, use 85–92. For thumbnails, email attachments, and social media, 70–75 works well. Google recommends keeping web images under 200 KB for fast page loading.
EXIF data (camera settings, GPS coordinates, date taken) may be stripped during compression to further reduce file size. This is often desirable for web images — it protects your privacy by removing location data and saves a few extra KB. If you need to preserve metadata for archival purposes, consider keeping the original file alongside the compressed version.
Currently, the tool processes one image at a time. Upload your JPG, compress and download it, then repeat for the next image. Each compression takes just a few seconds. This approach ensures maximum quality control for each individual image.
Yes, completely free. No signup, no watermarks, no file count limits. Upload your JPG, choose the quality level, and download the compressed result. Files are encrypted via HTTPS during upload and automatically deleted from our servers within 2 hours.

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