Compress Image Online —
Smaller Files, Same Quality

Upload your image to ImageResizer's free compress tool, use the quality slider to choose your compression level, and click Download. The entire process takes under 10 seconds and is completely free — no account, no watermark, no limits.

With lossy compression, some image data is removed — but at 75–85% quality the difference is invisible to the human eye. At that setting, a 3 MB photo typically compresses to under 500 KB with absolutely no visible quality difference. Lossless compression removes zero quality — it only strips metadata and optimizes encoding.

Typically 50–80% file size reduction is achievable while maintaining visually identical quality. For example, a 5 MB RAW photo from a DSLR can often be compressed to under 400 KB with no visible difference. Converting to WebP format adds an additional 25–34% reduction on top of that.

Our compressor accepts JPG, JPEG, PNG, and WebP files as input. You can output your compressed image in JPG (best for photos), PNG (best for graphics and transparency), or WebP (best for the smallest possible file size on websites). GIF support is coming soon.

No. Your images never leave your device. All compression is performed entirely inside your browser using the HTML5 Canvas API. There are no server uploads, no data logs, and no privacy risk — making it safe for sensitive photos, medical images, and confidential documents.

Lossy compression discards some image data permanently to achieve much smaller files — the quality difference is typically invisible at 75–85% setting. Lossless compression reduces file size without removing any image data by eliminating metadata and optimizing how the image is encoded — but achieves less size reduction (10–30%) compared to lossy compression's 50–80%.

For web and social media: use 75–80% quality — this achieves 60–70% file size reduction with invisible quality loss. For email: 70–75% is fine for photos. For print or professional archiving: use 90–95% or lossless PNG to preserve maximum detail. For WhatsApp: 60–70% is acceptable since the app will re-compress anyway.

Yes. Our bulk compression feature lets you upload and compress multiple images simultaneously. All files are processed in your browser at the same time. You can then download each compressed image individually or as a single ZIP file — great for photographers and content managers working with large batches.