Image Compressor — Reduce Photo File Size
Last updated: 2026-06-25
Photos never leave your device · 100% client-sideImage compression re-encodes the pixel data of a photo to shrink its file size (KB/MB) while keeping the quality almost intact.
Compressing JPG or WebP photos at 80–90% quality usually cuts file size by 40–70%, and everything happens inside your browser so your photos are never sent anywhere.
Image Compressor Tool
Compressing…
How to use
- Select images — Drag the images you want to compress, or upload them with the file picker. You can select multiple files at once.
- Adjust quality — Move the quality slider to set the compression strength. Lower values mean smaller files and lower quality.
- Check the result — Compare the original and compressed sizes to see how much you saved.
- Download — Click the download button to save the compressed image to your device.
What is image compression?
Image compression is the technique of re-storing the pixel data that makes up a photo in a more efficient way to reduce the file size. JPG and WebP use lossy compression, which discards tiny color differences the human eye barely notices, while PNG uses lossless compression that preserves the data exactly. Lossy compression can produce a much smaller file at the same perceived quality, which makes it ideal for photos.
The key is the quality value. Lowering quality from 100% to 80% barely affects how the image looks, yet often cuts the file nearly in half. Drop below 50%, on the other hand, and edges start to break up and blocky artifacts appear.
Recommended quality settings
| Quality | Expected savings | Recommended use |
|---|---|---|
| 90–100% | 10–30% | Print and archival high quality |
| 80–90% | 40–60% | Blog and social uploads (recommended default) |
| 60–80% | 60–75% | In-page web images |
| 40–60% | 75–85% | Thumbnails and previews |
| 10–40% | 85%+ | Temporary images where quality does not matter |
For more detail on compression strategy, the how to reduce image size without losing quality guide walks through it step by step. If you are unsure which format to pick, see WebP vs JPG vs PNG: which should you use.
Frequently asked questions (FAQ)
Does compressing an image ruin the quality?
Setting quality to 80–90% shrinks the file dramatically while the difference is hard to notice with the naked eye. Below 60% quality the loss becomes visible, so adjust to suit your use case.
Are my photos sent to a server?
No. Compression in ImageTools runs 100% inside your browser, and your photos are never uploaded or stored. It even works when you are offline.
Which compresses better, JPG or PNG?
Photos with lots of color compress much smaller as JPG or WebP. Simple images that need transparency, like logos and icons, are better as PNG. At the same quality, WebP is about 25–35% smaller than JPG.
Can I compress several images at once?
Yes. Select or drag multiple files and each image is compressed individually, ready to download one by one.
Is there a file size limit?
Because no server is used, there is no limit on the file size itself. However, depending on device memory, very large images are automatically scaled down to a maximum of 4096px for processing.
Related tools & guides
Resize Image
Adjust width and height in px to shrink or enlarge a photo.
Image Converter
Convert between PNG, JPG and WebP to optimize size and compatibility.
Crop Image
Drag to select just the area you want and crop it out.
Guide: reduce file size
Practical ways to shrink photos without losing quality.
Last updated: 2026-06-25