How to Use Image Compressor

Key Takeaways

Lossless compression (PNG, WebP lossless) reduces file size without discarding any pixel data — the decompressed image is bit-for-bit identical to the original

For most web images, 75–85% quality is the sweet spot — visually indistinguishable from the original while cutting file size by 40–70%

No — compression only affects the file encoding, not the pixel dimensions

WebP offers the best compression for most images — about 25–35% smaller than JPEG at equivalent visual quality, and 26% smaller than PNG

What is Image Compressor?

Image Compressor reduces the file size of PNG and JPEG images using quality-tuned compression — making them load faster on the web without visible degradation. All processing runs in your browser; images are never uploaded to a server.

Images are the #1 source of page weight on most websites. A 2 MB hero image that could be 200 KB is a 10× slower download. Compression is one of the highest-ROI performance optimizations you can make.

Compression Types Explained

Lossy Compression

Removes some visual detail that the eye doesn't notice. JPEG quality 80 is roughly half the size of quality 100 with nearly identical appearance.

Lossless Compression

Compresses without any quality loss. Smaller savings than lossy (typically 10–30%) but pixel-perfect output.

PNG Optimization

Removes metadata, optimizes the palette, and deflates more efficiently — typically 10–40% savings with zero quality loss.

JPEG Progressive

Restructures JPEG so the image loads progressively (blurry → sharp) instead of top-to-bottom. Better perceived performance.

Upload your image

Drag-and-drop or click to upload a PNG or JPEG. Multiple files supported.

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Set quality level

Drag the quality slider (1–100). 80 is the recommended default for most web images.

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Compare before/after

Side-by-side preview shows original vs compressed. Check for visible differences.

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Download compressed

Save the compressed file. File size and reduction % are shown before you download.

File Size Reduction Reference

Image Type	Original	Quality 80	Savings
Hero photo (JPEG)	2.4 MB	380 KB	84%
Product image (JPEG)	450 KB	95 KB	79%
Icon sheet (PNG)	180 KB	110 KB	39%
Screenshot (PNG)	1.1 MB	620 KB	44%

Tips & Common Mistakes

Set a file size budget. Hero images should be under 200 KB. Thumbnails under 30 KB. Blog inline images under 100 KB. Use these targets to guide your quality setting.

Don’t compress already-compressed images. Compressing a JPEG twice (re-encoding) adds generation loss. Always compress from the original source file, not from a previously compressed export.

Resize before compressing. A 4000×3000px image at quality 80 is still larger than a 1200×800px image at quality 90. Use Image Resizer to get dimensions right first, then compress.

Image Resizer — reduce dimensions before compressing
JPG to PNG Converter — convert format before optimizing
Image Cropper — remove unnecessary parts to reduce dimensions

Frequently Asked Questions

What is the difference between lossy and lossless compression?

Lossless compression (PNG, WebP lossless) reduces file size without discarding any pixel data — the decompressed image is bit-for-bit identical to the original. Lossy compression (JPEG, WebP lossy) discards some pixel data for much larger size reductions.

What quality setting should I use?

For most web images, 75–85% quality is the sweet spot — visually indistinguishable from the original while cutting file size by 40–70%. For hero images under close scrutiny, use 85–90%.

Will compression affect my image dimensions?

No — compression only affects the file encoding, not the pixel dimensions. Use Image Resizer to change dimensions separately.

Which format is best for web images?

WebP offers the best compression for most images — about 25–35% smaller than JPEG at equivalent visual quality, and 26% smaller than PNG. JPEG is best for broad browser compatibility. PNG for images needing transparency.

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