What is an Image Compressor?
An image compressor reduces the file size of a picture by re-encoding it with more efficient settings, so pages load faster and files fit into email and form limits.
This compressor runs entirely inside your browser using the canvas engine your browser already ships with. Your images are never uploaded to BitsSolved: nothing leaves your device.
When should you compress? Any image going on a website (Google's Core Web Vitals reward fast-loading pages), email attachments near provider limits, and portal uploads with size caps. A 4 MB phone photo typically compresses to 300-600 KB with no visible difference at web sizes: that is a page that loads seconds faster on mobile data.
Supported formats
- JPG / JPEG
- PNG
- WebP
How much smaller will the file actually get?
It depends on what is in the picture, and the difference is large. A photograph holds millions of slightly different pixels, and at quality 80 it usually gives up two thirds to four fifths of its weight with nothing visible at the size a web page displays it. A flat graphic, a logo or a screenshot of text behaves in the opposite way: those have large areas of identical color, which JPEG handles badly and WebP handles very well.
Files that have already been squeezed have less left to give. Running an image that another tool has compressed already will save little, and every lossy pass discards detail permanently, so start from the original whenever you still have it.
One setting does most of the work. Quality 80 is the usual place to land. Below about 60 the artifacts start to show, and they show first in skies, gradients and skin tones, because those are the smooth areas where JPEG has the least detail to hide behind.
What compressing does not do
Three things surprise people, and all three are worth knowing before you send the file on:
- It does not change the pixel dimensions. A photo 4000 pixels wide stays 4000 pixels wide. For a web page the larger win is usually to resize first and compress second.
- It does not keep transparency when the output is JPG. JPEG has no alpha channel, so transparent areas are filled with white before encoding. Choose PNG or WebP when the transparency matters.
- It does not carry metadata across. Re-encoding writes a fresh file, so camera EXIF, GPS coordinates and embedded color profiles are left behind. That is usually a privacy gain, and occasionally a loss if you needed the shot data.
Frequently asked questions
What quality setting should I use?
70-85 is the sweet spot for photos: files shrink 60-80% while artifacts stay invisible at normal viewing sizes. Go lower only for thumbnails; go higher only for print-bound images.
Should I compress before or after resizing?
Resize first, then compress: shrinking a 4000px photo to the 1200px you actually display removes far more bytes than quality reduction alone, and the compressor here pairs naturally with our Image Resizer.
Are my images uploaded to a server?
No. Compression happens locally in your browser. The image never leaves your device, which also makes the tool fast.
Does compression reduce quality?
Lossy formats like JPG and WebP trade a little quality for a much smaller file. At quality 70-85 the difference is rarely visible. PNG input converted to WebP or JPG can shrink dramatically.
Is there a file size limit?
Only what your browser can hold in memory: in practice images up to tens of megabytes work fine.
Do you add a watermark?
Never. The output is your image, only smaller.