Guide
How to compress an image without uploading it
A phone photo easily weighs 3 to 5 MB, while many forms accept 1 or 2 MB and a web page wants a few hundred KB. Getting there without the photo looking worse is mostly a matter of doing two things in the right order.
Steps
- Check the limit you need to meet: the form, the email or the page.
- If the image is much larger than where it will be shown, resize it first.
- Compress with quality around 75 to 85.
- Compare the result with the original at full size.
- Download it if the difference is invisible, or try a little higher quality.
Resize first, then compress
A 4000-pixel-wide photo shown 1200 pixels wide carries more than ten times the pixels anyone will see. Cutting the dimensions to what is needed usually shrinks the file more than any quality setting, and costs nothing visible.
Then compress. For JPEG and WebP, quality between 75 and 85 is the usual sweet spot: files several times smaller with no difference at normal viewing size. Below 60, blocky artefacts start to show around edges and text.
The format matters as much as the setting
Photos compress best as JPEG or WebP; WebP is typically 25 to 35% smaller at the same quality and is read by every current browser. A screenshot saved as PNG can be huge — if it is mostly a photo, JPEG will be a fraction of the size; if it is mostly text, keep PNG so the letters stay sharp.
Avoid compressing the same JPEG over and over: each save loses a little more. Start from the original each time.
Why doing it in the browser matters
Most online compressors upload the photo to their server. Here the image is processed inside the page and never leaves your device — which matters for documents, screenshots of banking apps and family photos. The GPS location and other metadata are not copied into the result either.
Frequently asked questions
Does compressing an image reduce quality?
Lossy compression discards detail, but at quality 75 to 85 the loss is invisible at normal size. PNG compression is lossless and keeps every pixel.
How do I get an image under 1 MB?
Resize it to around 2000 pixels on the long side, then compress as JPEG at quality 80. A typical phone photo ends up well under 1 MB.
Is compressing the same as resizing?
No. Compression changes how the pixels are stored; resizing changes how many there are. Doing both gives the smallest file.
Is my image uploaded?
No. It is processed in your browser and never sent to a server.
Use the tool
Apply these steps directly in the browser.
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