Compress Image
Reduce image file size without visible quality loss
Updated · Guide: How to Optimize Images for Website Performance
Processed on our server. Sent over HTTPS to an isolated job, then deleted once you download.
Drop an image here
JPG, PNG, WebP, AVIF, TIFF, GIF, BMP, HEIC
Max 50 MB
Output format
Add an image to start
Up to 50 MB per file
No daily limit and no watermark on the result.
No account needed
Free to use. No signup, no email, no trial.
How to use Compress Image
Upload your image
Click the upload area or drag and drop one or more image files.
Adjust the quality setting
Move the quality slider: lower values give smaller files, higher values preserve more detail.
Click Compress
The image is compressed on our server. A file size comparison is shown so you can see the reduction.
Download the compressed image
Click Download to save. For multiple images, download each individually or as a zip.
What is image compression?
Reduce image file size while maintaining visual quality. Adjust the compression level to find the right balance for your needs. Supports JPG, PNG, WebP, and AVIF. See our processing model for how this tool handles your files.
Image compression reduces an image's file size by storing its pixels more efficiently, often discarding detail the eye is unlikely to notice. Halving an image file is usually free in visual terms: the bytes you give up are detail your eye was never going to resolve at display size. Compress Image finds that line for you, with a quality slider and a before-and-after comparison to check the result against.
Compression runs on our server using the sharp image library, and files are deleted right after download. You can adjust the quality slider to balance file size against visual fidelity, and compare before and after to pick the right setting.
Performance budgets are what make this matter at scale. Core Web Vitals penalise heavy pages, and a single uncompressed 5 MB hero photo can push Largest Contentful Paint past the 2.5-second threshold on its own, with the ranking consequences that follow. A catalogue of several hundred product images compressed to quality 80-85 saves gigabytes of monthly bandwidth with no visible difference. At the other end of the scale, attachment ceilings do the forcing instead: roughly 25 MB on Gmail, 20 MB on Outlook.
The compression behavior depends on the image format. JPG uses DCT-based lossy compression that discards high-frequency detail imperceptible to the human eye; quality 85 typically reduces file size by 40-60% with no visible degradation in photographs. PNG uses DEFLATE lossless compression, preserving every pixel exactly, which makes it ideal for screenshots, logos, and graphics with sharp edges or text. WebP combines lossy and lossless modes and typically produces files 25-34% smaller than equivalent JPG at the same visual quality. For the best results, consider converting PNG photos to WebP using the Convert Image tool before compressing, and use Resize Image to reduce dimensions if the image is larger than needed for its display context. Our image optimization guide covers format selection and quality settings in detail.
Frequently asked questions
How much smaller will my image be after compression?
Results depend on the image content and quality setting. Photographs typically compress by 40-70% at quality 80 with little visible difference. Screenshots and graphics with flat colors compress very efficiently.
Does compression reduce image dimensions?
No. Compression only reduces file size by encoding image data more efficiently. The pixel dimensions (width and height) remain exactly the same. If you need to reduce dimensions as well, use Resize Image before or after compressing.
Is the compression lossy or lossless?
For JPG and WebP, compression is lossy: very small visual details are discarded to achieve smaller sizes. For PNG, lossless compression is used, preserving every pixel. You can compare the original and compressed output in the tool before downloading.
Are my images uploaded to your server?
Yes. Images are uploaded over HTTPS, compressed on our server with the sharp image library, and deleted right after download. See our processing model for the full client-side vs. server-side breakdown.
How do I optimize images for my website?
Upload your images and set quality to 75-85 for JPG or WebP. This gives the best balance of file size and visual quality for web use. For further savings, convert PNG photos to WebP using the Convert Image tool. Aim for images under 200 KB for fast page loads and better Core Web Vitals scores.
What quality setting should I use for different purposes?
For web images and social media, quality 75-85 provides an excellent balance of size and appearance. For print-quality images, use quality 90-95 to preserve fine detail. For email attachments where size limits matter, quality 60-70 produces acceptably sharp images at significantly reduced file sizes. Always preview the compressed result before downloading; the tool shows a before/after comparison so you can verify the quality meets your needs.
What is the difference between image compression and image resizing?
Compression reduces file size by encoding pixel data more efficiently (or discarding imperceptible detail) without changing the image dimensions. Resizing changes the pixel dimensions (width and height) of the image. Both reduce file size, but they work differently. For maximum file size reduction, resize the image to the dimensions you need, then compress the result.
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