How to compress images
- Add your images. Drag them onto the box or click to choose. You can add JPG, PNG, WebP, GIF and BMP files — as many as you like.
- Pick a quality level. 75% is a good default. Go lower for the smallest files, or higher if the image contains fine detail or text.
- Optionally set a maximum width. Photos from modern phones are often 4,000 pixels wide or more. Limiting the width to 1,920 or 1,280 pixels reduces the size dramatically without any visible loss on screens.
- Press “Process images”, compare the before and after sizes, and download each image or all of them as a ZIP.
How image compression works
Most photos are saved as JPG (or the newer WebP), which use lossy compression. The encoder throws away detail that the human eye barely notices — subtle colour variations and very fine texture — and stores the rest efficiently. The quality setting controls how much is thrown away. Between about 60% and 85%, most people cannot see any difference at normal viewing size, but the file can be 3–10 times smaller than the original.
PNG uses lossless compression, which keeps every pixel exactly. That is ideal for screenshots, logos and graphics with sharp edges, but PNG photos are very large. Converting a PNG photo to JPG or WebP is usually the single biggest saving you can make.
What “Auto” format does
With Auto selected, each image is saved in the format that makes sense for it: photos and images without transparency become JPG; images with transparent areas are saved as WebP (or PNG if your browser cannot create WebP), so the transparency is kept. If a compressed version turns out larger than your original — which can happen with images that are already well optimised — the tool tells you and keeps the original size.
Why compress images?
- Faster websites. Images are usually the heaviest part of a web page. Smaller images load faster, improve Google’s Core Web Vitals scores and help pages rank better.
- Upload limits. Job portals, university admissions, visa forms and government sites often limit photo uploads to 100 KB, 200 KB or 1 MB.
- Email attachments. Most email providers cap attachments at 20–25 MB in total.
- Save storage. Compressing a photo library can free gigabytes on your phone or cloud storage.
- Online shops. Marketplaces load faster and convert better with lightweight product photos.
Recommended settings
| Use | Max width | Quality | Format |
|---|---|---|---|
| Website hero / banner | 1920 px | 70–80% | WebP or JPG |
| Blog post image | 1200 px | 70–75% | WebP or JPG |
| Product photo | 1600 px | 80% | JPG |
| Email / WhatsApp | 1280 px | 70% | JPG |
| Logo or screenshot | Original | — | PNG |
Need an exact size such as “under 100 KB”? Use our Reduce Image Size to 100 KB tool, which finds the right quality automatically.
Is it safe?
Yes. Unlike most online compressors, this tool never uploads your pictures. Compression is done by your own browser, which makes it suitable for private photos, ID documents and client work. Compressed images are created as new files — your originals are not changed.
Frequently asked questions
Will compressing reduce image quality?
At quality settings of about 70% and above, the difference is usually invisible at normal viewing size. Very low settings can cause blur or blocky areas, so check the preview before using the result.
Are my photos uploaded to a server?
No. Images are compressed inside your browser and never leave your device.
Why did my PNG get only slightly smaller?
PNG is lossless, so the quality slider has no effect on PNG output. To make a PNG photo much smaller, choose JPG or WebP as the output format (or Auto).
Is there a limit on file size or number of images?
There is no fixed limit. Very large images (over about 50 megapixels) may fail on phones with limited memory; try a desktop browser or set a maximum width.
Does compression remove EXIF data?
Yes. Re-encoding through the browser removes most metadata such as camera details and GPS location, which is good for privacy. Images are rotated correctly before saving.
Which format gives the smallest files?
WebP is usually 25–35% smaller than JPG at similar quality and supports transparency. JPG has the widest compatibility with older software and upload forms.