Compress Image Online

Reduce image file size by up to 80% with adjustable quality. Supports JPG, PNG, WebP, HEIC, and 15+ formats. Free, no signup.

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

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How to Compress an Image Online

1

Upload

Drag and drop your image into the tool above, or click to browse. Supports JPG, PNG, WebP, HEIC, and 15+ formats 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 image. The result shows exactly how many bytes you saved.

Understanding Quality Levels

Quality Size Reduction Visual Quality Best For
92 (Very High) 10–20% Indistinguishable from original Photography portfolios, print-ready images, archival
85 (High) 30–40% Near-original, no visible artifacts Hero images, product photos, high-quality web content
80 (Good) 40–50% Visually identical for most images General web use, blog posts, social media. Recommended default.
75 (Medium) 50–60% Minimal difference, slight softening Email attachments, thumbnails, non-critical images
60 (Low) 70–80% Visible artifacts on detailed areas Previews, placeholders, images where size matters most

How Image Compression Works

JPEG compression works by analyzing the image in 8×8 pixel blocks using a mathematical technique called Discrete Cosine Transform (DCT). It discards fine details that the human eye is least sensitive to. Lower quality values discard more data, producing smaller files. At quality 80, the discarded data is imperceptible in normal viewing conditions.

WebP compression uses a similar approach but with more advanced prediction algorithms. WebP typically achieves 25–34% better compression than JPEG at the same visual quality, making it the preferred format for web images.

PNG compression is fundamentally different — it uses lossless DEFLATE compression. Changing the quality setting affects the compression effort (how hard the algorithm tries to find patterns), not the visual quality. PNG files are always lossless, so the size reduction is more modest (typically 10–30%).

Pro tip: For maximum file size reduction, convert PNG images to JPG or WebP using the format picker. A 5 MB PNG photo can become a 200 KB JPG at quality 80 — a 96% reduction — with no visible quality loss for photographs.

Best Practices by Use Case

Use Case Recommended Quality Format Target Size
Website / Blog 80 WebP or JPG Under 200 KB for fast loading (Google PageSpeed recommendation)
Email Attachment 75–80 JPG Under 1 MB per image. Most email providers limit total attachment size to 25 MB.
Social Media 80–85 JPG or PNG Under 1 MB. Platforms re-compress anyway, so quality above 85 is wasted.
E-commerce Product 85–92 WebP with JPG fallback Under 300 KB. Product detail matters — use higher quality.
Print / Archive 92 or Original PNG Original format No target — preserve maximum quality for future use.

Supported Formats

Format Compression Type Notes
JPG / JPEGLossy (quality-based)Best results with quality compression. The most widely supported image format.
WebPLossy (quality-based)25–34% smaller than JPG at same quality. Ideal for web. Supported by all modern browsers.
PNGLossless onlyQuality setting affects compression effort, not visual quality. For significant size reduction, convert to JPG/WebP.
GIFPalette-basedAutomatically optimized with lossy palette reduction. Best for simple graphics and animations.
BMPUncompressedNo compression in BMP format. Convert to JPG/WebP for massive size reduction.
TIFFLosslessProfessional format. Convert to JPG/WebP for smaller files suitable for web.
HEICLossy (input only)Apple's format. Upload HEIC and convert to compressed JPG/WebP for universal compatibility.
AVIFLossy/LosslessNext-gen format with excellent compression. Full quality control support.

Frequently Asked Questions

Yes, completely free. No signup, no watermarks, no limits on the number of images you can compress. Just upload your image, choose the quality level, and download the compressed result. Your files are encrypted via HTTPS and automatically deleted from our servers within 2 hours.
It depends on the compression level. 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 artifacts on detailed areas, but the file size reduction is 50–80%. PNG compression is always lossless — no visual quality is ever lost.
JPG, PNG, WebP, GIF, BMP, TIFF, HEIC, AVIF, and more. JPG and WebP benefit most from quality-based compression with dramatic file size reduction. PNG uses lossless compression, so the size reduction is more modest. You can also convert between formats during compression — for example, converting PNG to WebP for maximum compression.
Typical savings for JPEG/WebP: 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 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 web images — it reduces file size by 40–50% with no visible quality loss. For hero images and photography portfolios, use 85–92. For thumbnails and social media, 75 works well. Google recommends keeping images under 200 KB for fast page loading. Use WebP format for the best compression-to-quality ratio.

Related Image Tools

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