Images
Image Compressor & Resizer
Drop a photo in, pick a maximum width and a quality level, and get a smaller file back. Everything happens on a canvas inside the page, so private photos never touch a server.
Choose an image to see the result.
How to use it
- Choose an image — JPG, PNG, WebP and most modern formats work.
- Set the maximum width: 1600 px suits a blog, 800 px suits email.
- Lower the quality until the size is right; below about 55 the artefacts show.
- Press Download to save the new file.
What “quality 85” actually means
JPEG quality is not a percentage of the original. It is a scalar that drives the quantisation table — how aggressively high-frequency detail is discarded. The curve is steep at first and flat afterwards: going from 100 to 85 typically halves the file with almost no visible change, while going from 85 to 70 starts to show ringing around sharp edges. That is why 80–85 became the usual default, and why pushing lower rarely buys much more.
Choose the format before touching the slider
JPEG for photographs, PNG for images with few colours, hard edges or transparency, WebP for both at a smaller size, AVIF for the smallest files at a real encoding cost. Compressing a screenshot as JPEG is the most common mistake: text develops coloured halos that no quality setting fixes, because those artefacts are structural rather than a matter of degree.
Working against an upload limit
When a form caps files at 2 MB, aim for 1.6 MB rather than 1.95 — re-encoding can shave a few kilobytes off an already-compressed file, so a result that just fits may not fit after the next tool touches it. Change one variable per attempt: quality first, then dimensions, because halving the pixel count is a far larger cut than dropping quality from 85 to 70.
Strip metadata before you ship. EXIF from a phone photo can carry GPS coordinates, the device serial number and the exact capture time — a few kilobytes that serve no purpose on a web page and occasionally leak more than the photographer intended.
Frequently asked questions
Are my photos uploaded to a server?
No. The image is decoded, redrawn onto a canvas and re-encoded entirely in memory on your machine.
Which format should I pick?
WebP gives the smallest file at equivalent quality and works in every current browser. JPEG is the safest for email and older software.
Why did the file get bigger?
Re-encoding an already-compressed JPEG at high quality, or turning a small JPEG into PNG, can increase size. Lower the quality or keep the original format.
Does compressing remove the original file?
No. Nothing leaves your browser and the original on disk is untouched; you download a new file alongside it.
Should I choose WebP over JPEG?
For the web, usually yes — 25–35% smaller at matched quality, and every current browser supports it. Keep JPEG for anything that may be opened by older desktop software or attached to email.