Image Compression
Compress JPG Images
JPEG is still the default format for photographs, and most cameras and phones save files far larger than a web page needs. Re-encoding at a lower quality setting removes detail the eye rarely notices while cutting the file to a fraction of its original weight.
Drop your photos below, choose a quality level, and compare the before and after sizes for each file.
Drag images here
JPG, PNG or WebP · up to 20 files · processed inside your browser
How to use this tool
- 1Add one or more JPG files by dragging them in or clicking the drop area.
- 2Move the quality slider. 80 is a safe default for photos; 60–70 suits thumbnails.
- 3Press compress and check the saved percentage listed next to each file.
- 4Download files individually, or grab everything at once as a ZIP.
What quality level should you pick?
JPEG quality is not a percentage of visual fidelity, it is a knob that controls how aggressively frequency information is discarded. In practice the useful range for web images sits between 60 and 85. Above 85 the file grows quickly with almost no visible gain. Below 55 you start seeing blocking around edges and banding in skies.
A 3000 px holiday photo saved at quality 92 by a phone might weigh 4 MB. The same photo at quality 78 usually lands near 700 KB, and side by side on a screen most people cannot tell them apart.
Compression is not reversible
Every JPEG save throws away data permanently. Compressing an already compressed file compounds those artifacts, so always start from the highest quality original you still have rather than from a copy that has been through several rounds.
Resize first, then compress
If the image will display at 800 px wide, no amount of quality tuning beats simply resizing it. Use the resize tool first, then compress the smaller version. The combination typically produces files five to ten times lighter than quality tuning alone.
Frequently Asked Questions
Does compressing a JPG change its dimensions?
No. Only the encoding quality changes. Pixel width and height stay exactly the same. Use the resize tool if you also need smaller dimensions.
Is my photo uploaded anywhere?
No. Compression runs in your browser using the canvas API. The file never leaves your device.
Why did my file get bigger?
If the original was already saved at a very low quality, re-encoding at a higher setting can add bytes. Lower the slider or keep the original.
Can I compress many photos at once?
Yes. Add as many files as you like and download the results as a single ZIP archive.