Photo for a web page
- Input
- 3.8 MB JPG at 4000 × 3000, quality 80%
- Output
- About 400–600 KB, no visible difference
Camera JPEGs are saved at near-maximum quality. Dropping to 80% typically removes most of the file size and none of the visible detail.
Image Compressor
Compressing an image reduces its file size by storing the picture less precisely, usually with no difference you can see at normal viewing size. Drop images in, choose how hard to compress, and download the results. Everything runs in your browser, so nothing is uploaded.
Runs entirely in your browser — your images are never uploaded.
How to
How to use the Image Compressor
- 1
Add your images
Drop in one or many. JPG, PNG, WebP, AVIF, GIF and BMP are all accepted.
- 2
Choose a quality level
80% is the usual sweet spot for photos. Lower it further if the file still needs to be smaller.
- 3
Compare the result
Each image shows its original and compressed size with the percentage saved, so you can judge the trade-off.
- 4
Download
Save images one at a time, or take the whole batch as a ZIP.
Examples
Image Compressor examples
Screenshot
- Input
- PNG screenshot, converted to WebP
- Output
- Often 60–80% smaller
PNG is lossless and poor at photographic content. For screenshots with gradients, WebP is dramatically smaller at the same visual quality.
Already-compressed file
- Input
- 180 KB JPG at quality 75%, compressed again
- Output
- Little saving, slightly worse quality
Re-compressing a lossy file discards more detail without much size benefit. Compress from the original whenever you can.
Why use it
What the Image Compressor gives you
See the saving before you commit
Every image reports its original size, new size and the percentage saved, so you are not guessing.
Warns when compression backfires
If the output would be larger than the input — which happens with already-optimised files — you are told rather than handed a bigger file.
Batch processing
Compress a whole folder of images in one pass and download them as a ZIP.
Photos stay the right way up
EXIF orientation is applied when decoding, so portrait phone photos do not come out sideways.
Nothing is uploaded
Images are decoded and re-encoded by your own browser. They never leave your device.
Good to know
Image Compressor limitations
- Compression is lossy and cannot be undone. Keep your originals.
- Re-compressing an already-compressed file loses quality for very little size benefit.
- Images are limited to 25 MB each, since decoding happens in browser memory.
- Animated GIFs are flattened to a single frame. Use a dedicated GIF tool to keep animation.
Summary
Image Compressor in short
- Compression trades a little image detail for a much smaller file.
- Around 80% quality is the usual sweet spot for photographs.
- Converting a PNG screenshot to WebP usually saves far more than compressing the PNG.
- Everything runs locally and images are never uploaded.
FAQ
Image Compressor questions
How does image compression work?
Lossy compression stores the picture approximately, discarding detail the eye is least sensitive to — mostly fine colour variation. At moderate settings the result is visually identical to the original but a fraction of the size.
What quality should I choose?
Start at 80%. For photos on a web page that is usually indistinguishable from the original at a fraction of the size. Go to 60–70% when size matters more than fine detail, and above 90% only when the image will be examined closely.
What is the difference between lossy and lossless?
Lossy formats such as JPEG, WebP and AVIF discard detail permanently to save space. Lossless formats such as PNG keep every pixel exactly but produce much larger files for photographic content.
Will my image look worse?
At 80% and above, rarely in any way you would notice at normal viewing size. Below about 60% you start to see blocking around sharp edges and banding in smooth gradients.
Why did my file barely get smaller?
It was probably already compressed. A JPEG saved at 75% has little left to remove, and compressing it again mostly costs quality. Always compress from the highest-quality original you have.
Why did my file get bigger?
This happens when the input is already more efficiently compressed than the settings you chose — common with small PNGs and optimised JPEGs. The tool flags it so you can keep the original instead.
Should I keep PNG or switch to JPEG?
Keep PNG for logos, icons, screenshots of text and anything needing transparency. Use JPEG or WebP for photographs, where PNG produces files several times larger for no visible benefit.
Can I compress many images at once?
Yes. Add as many as you like, up to 25 MB each, and download the finished batch as a single ZIP.
Does compressing send my photos anywhere?
No. Decoding and re-encoding happen in your browser using the canvas API, so the images never leave your device and no account is needed.
Discover
Related image tools
Image ConverterConvert images between JPG, PNG, WebP and AVIF in your browser. Batch convert, control quality, and download as a ZIP.Image ResizerResize images by pixels or percentage, with the aspect ratio locked. Batch resize and download as a ZIP. Runs in your browser.WebP ConverterConvert JPG and PNG images to WebP, or WebP back to JPG and PNG. Batch convert with quality control, all in your browser.AVIF ConverterConvert JPG, PNG and WebP images to AVIF, the smallest modern image format, or convert AVIF back for compatibility.