How to Compress an Image Online
Big image files slow down websites, fill up storage and bounce off email size limits. Compressing them keeps the picture looking sharp while cutting the file size dramatically. This free image compressor shrinks JPG, PNG and WebP images using smart quality and format choices — and it all runs inside your browser, so your photos never leave your device. Compress one image or a whole batch, then download them all as a ZIP.
Add your images
Drop one or many JPG, PNG or WebP files. They are read and compressed locally on your device, never uploaded.
Pick quality & format
Choose Smaller, Balanced or Best quality, an output format, and optionally resize to a max width.
Download the result
See the exact size saved for each image, then save one file or grab them all as a single ZIP.
Quality, Size and Formats
Good compression is about picking the right trade-off. Here is how each control changes your result:
Compression level
Balanced suits almost everything. Choose Smaller file for the tiniest size (great for web and email), or Best quality when the image must stay crisp.
Auto format
Auto picks WebP when your browser supports it — the same picture at a much smaller size than JPG or PNG, with transparency kept.
JPG output
The most compatible choice for photos. Small files that open everywhere; transparent areas become white.
PNG output
Lossless with colour optimisation, ideal for logos, screenshots and graphics with sharp edges or transparency.
Resize while compressing
Capping the width to 1920px or 1280px shrinks a huge camera photo enormously with no visible loss on screens.
Never larger than the original
If a setting would make the file bigger, the tool automatically keeps your original instead — you never lose by compressing.
Free and 100% Private
This compressor is genuinely free and genuinely private. There is no account to create and no daily cap — and because every image is processed by your own browser, your photos never leave your device. Nothing is uploaded, stored or seen by anyone, which makes it safe for personal photos, ID scans and client work alike. The compressed images carry no watermark.
Smaller images make everything faster: pages load quicker, emails actually send, and you fit more into limited storage or upload forms. After compressing you can turn images into a document with Image to PDF, change format with PNG to JPG, or shrink a document instead with Compress PDF.
Compress Images on Any Device
How to compress an image on Windows
Open this page in any browser, drop your JPG or PNG, pick a compression level and click Compress. Each image is optimised on your PC and you can save them individually or as a ZIP.
How to compress an image on Mac
Open the page in Safari or Chrome, add your images, and download the smaller files. Everything runs locally, so it works the same on any Mac with nothing to install.
How to compress a photo on Android or iPhone
Open this page in Chrome or Safari on your phone, tap to pick photos from your gallery, choose Smaller file, and save the compressed versions straight to your device.
How to compress an image for email
Pick the Smaller file level and, for big camera photos, set Resize to Max 1920px. That usually drops a multi-megabyte photo well under typical email limits while still looking sharp.
How to compress an image without losing quality
Use Balanced or Best quality with Auto format — Auto chooses WebP, which keeps the picture looking identical at a fraction of the size. PNG output stays lossless for graphics.
How to compress an image to a smaller KB size
Choose Smaller file and, if needed, resize the width down. The tool shows the exact new size for each image so you can dial it in quickly.
Frequently Asked Questions
How do I compress an image for free?
Add your image above, pick a compression level, and click Compress. You will see the new size in seconds — free, with no signup and no watermark.
Will compressing reduce the quality?
Only as much as you allow. Balanced and Best quality keep images looking sharp; Smaller file trades a little detail for the tiniest size. Auto and PNG stay visually lossless.
Can I compress multiple images at once?
Yes. Add as many images as you like, compress them in one batch, then download each one or all of them together as a single ZIP.
Are my images uploaded to a server?
No. The whole process runs inside your browser, so your images never leave your device. Nothing is uploaded, stored or seen by anyone.
What formats can I compress?
JPG, PNG and WebP are fully supported, and you can output to JPG, PNG, WebP or let Auto pick the smallest option for you.
How much smaller will my image get?
It depends on the image, but photos often shrink by 50–80%. The tool shows the exact before-and-after size and percentage saved for every file.
Does it keep transparency?
Yes. Auto and PNG/WebP output preserve transparency. Only JPG output flattens transparent areas to white, since JPG has no transparency.
Can I resize and compress at the same time?
Yes. Set a max width (1920px or 1280px) to shrink large photos further — this often gives the biggest size savings with no visible loss on screens.
Is there a file size or count limit?
There is no fixed limit — very large images just take a moment longer since everything runs on your device.
Do I need to install anything?
No. It works in your web browser on any device, with nothing to download or install.
Is this image compressor really free?
Completely free, with no account, no watermark, no limit and no premium wall.
100% private — your images are compressed right here in your browser and never uploaded to any server.
Last updated: July 2026 · FlipMyFormat Image Compressor
Written and maintained by the FlipMyFormat team