Frequently asked questions
How the compressor works, what it can handle, and what happens to your files.
Privacy and files
Are my images uploaded to a server?
No. The tool reads your file into browser memory, redraws it on an HTML5 canvas, and re-encodes it there. No network request carrying your image is ever made, so we could not see your files even if we wanted to.
Do you keep copies of what I compress?
There is nothing to keep. The working copy lives in the tab and is discarded when you close or reload the page.
Can I use it offline?
Once the page has loaded, compression itself does not need a connection. If you lose your connection mid-session the tool will keep working, although ads and analytics will not load.
Formats and quality
Which formats are supported?
JPG, PNG and WebP, both as input and as output. You can compress within the same format or convert between them.
Which format gives the smallest file?
WebP, almost always — commonly 25–35% smaller than an equivalent-quality JPG. It is supported by every current browser. Use JPG only if you need compatibility with older software.
What quality setting should I use?
75% is a good default for photos on the web: a large size reduction with changes that are hard to see at normal viewing size. Drop to 60% for thumbnails and background images; stay at 85–90% for product photography or anything that will be zoomed into.
Why did my PNG barely shrink?
PNG is lossless, so the quality slider does not apply to it — re-encoding alone can only do so much. For photographic content saved as PNG, switch the output format to WebP or JPG and the saving is usually dramatic. Keep PNG only when you need transparency or crisp flat-colour graphics.
Will transparency be preserved?
Yes, if you output to PNG or WebP. Converting a transparent image to JPG will replace transparent areas with a solid background, because JPG has no alpha channel.
Limits and troubleshooting
Is there a file size or quantity limit?
Files up to 25MB each. There is no fixed cap on how many you add at once — the practical limit is your device's available memory.
My compressed file came out larger than the original. Why?
This happens when the original was already heavily optimised, or when converting a small flat-colour PNG into a photo format. Try a lower quality setting, or keep the original where it is already smaller.
"Download all" only saved one file.
Some browsers block multiple automatic downloads. Allow multiple downloads for this site when prompted, or save each file with its individual Download button.
Does compressing strip EXIF data?
Yes. Because the image is redrawn from pixels, metadata such as camera model, GPS coordinates and timestamps is not carried into the output. For most people this is a privacy benefit, but if you need EXIF preserved, this tool is not the right choice.
Site and usage
Is it free, and is there a catch?
Free, with no account and no watermark. The site is funded by the advertising displayed around the tool.
Can I use compressed images commercially?
Yes. You keep every right you had in the original file; we claim nothing.
Still stuck? Send us a message with your browser version and the file type that caused trouble.