How to Reduce Image Size Without Losing Quality
Short answer
Do three things in order: resize the image to the largest size it will actually be shown at, choose the right format (JPG or WebP for photos, PNG or WebP for graphics with sharp edges or transparency), then compress with a quality setting around 75–85% and compare the result side by side. Resizing a 12-megapixel phone photo to 1600 × 1200 keeps only about 16% of the pixels and usually cuts the file size dramatically with no visible difference on screen.
Large images slow down websites, fill up email attachments and hit upload limits on forms and job portals. The good news is that most photos straight from a phone or camera contain far more data than anyone will ever see on a screen. By removing what is not needed, you can usually make files many times smaller while keeping them looking the same to the human eye.
Step 1: Resize to the size you actually need
This is the biggest win. A modern phone photo is often around 4032 × 3024 pixels, about 12.2 megapixels. A blog post, product page or email rarely shows an image wider than 1,000 to 2,000 pixels. Resizing that photo to 1600 × 1200 (about 1.9 megapixels) keeps roughly 16% of the pixels, and file size drops by a similar order of magnitude.
Use the image resizer to set a width or height in pixels or a percentage, with the aspect ratio locked so nothing looks stretched. A good rule is to make images about twice the width they are displayed at in CSS pixels if you want them to look sharp on high-density (“retina”) screens, and no larger.
If only part of the photo matters, crop first with the image cropper. Removing empty background removes pixels, and fewer pixels means a smaller file.
Step 2: Choose the right format
| Image type | Best format | Why |
|---|---|---|
| Photos | WebP or JPG | Lossy compression is very efficient for natural images |
| Logos, icons, screenshots with text | PNG or lossless WebP (or SVG for logos) | Keeps sharp edges and flat colours crisp |
| Images needing transparency | PNG or WebP | JPG has no transparency |
Google’s WebP documentation reports that lossless WebP files are about 26% smaller than PNGs, and lossy WebP files are 25–34% smaller than comparable JPGs. Converting with the WebP converter is often an easy extra saving for websites. For a full comparison, read PNG vs JPG vs WebP.
A common mistake is saving photos as PNG. Because PNG is lossless, a photo saved as PNG can be several times larger than the same photo as a high-quality JPG, with no visible benefit.
Step 3: Compress with a sensible quality setting
Lossy formats like JPG and WebP let you choose a quality level. Lower quality means smaller files but eventually visible artefacts: blockiness, blurred detail and colour banding in skies.
- Start around 75–85%. For most photos on screen, this range is hard to tell apart from the original.
- Compare at 100% zoom, looking at faces, text, fine textures and smooth gradients.
- Lower it step by step until you see a difference, then go back up one step.
The image compressor shows the original and new file size as you move the quality slider, and it runs in your browser, so private photos are never uploaded.
Step 4: Remove unnecessary metadata
Photos often include EXIF metadata: camera model, settings and sometimes GPS location. It adds a little to the file size and can reveal where a photo was taken. Re-saving an image through a browser-based tool that redraws it, as our resizer and compressor do, generally does not carry the original EXIF data into the new file. That is a privacy bonus when you share photos publicly.
What “without losing quality” really means
Strictly speaking, only lossless methods keep every pixel identical: resizing is not one of them, and neither is JPG compression. But what most people want is no visible loss at the size the image will be viewed. Resizing to the display size and using a moderate quality setting achieves that. If you need truly lossless results, for example for archives or images you will edit again, keep the original and use PNG or lossless WebP for the copy.
Always keep the original
Compression is a one-way street: each time you re-save a JPG, a little more detail is lost. Keep your original file safe and make compressed copies from it, rather than compressing an already-compressed file again.
Typical targets
- Website hero image: about 1600 to 2400 pixels wide; aim for a few hundred KB at most.
- Blog or product image: about 800 to 1200 pixels wide.
- Email attachment: 1600 pixels on the longest side is plenty for viewing on screen.
- Upload limits on forms: resize first, then lower quality until you are under the limit.
For recommended dimensions for social media, websites and thumbnails, see image sizes for the web.
Faster pages and better search visibility
Smaller images load faster, which helps visitors on mobile data and improves page experience. Google’s image guidelines also recommend descriptive file names and alt text, so rename “IMG_4821.jpg” to something like “red-trail-running-shoes.jpg” before uploading, and describe the image in the alt attribute. When you are choosing colours for graphics, our guide to converting HEX to RGB helps you match brand colours exactly.
Frequently asked questions
How can I reduce image size without losing quality?
Resize the image to the size it will be displayed at, use an efficient format such as WebP or JPG for photos, and compress with a quality setting around 75–85%, checking the result side by side.
Does resizing an image reduce its file size?
Yes. Fewer pixels means less data. Halving the width and height leaves a quarter of the pixels, which usually reduces file size a lot.
What quality setting should I use for JPG?
Around 75–85% is a good starting point for photos on screen. Compare with the original and adjust.
Is PNG or JPG smaller?
For photos, JPG is usually much smaller. For logos, icons and screenshots with flat colours and text, PNG is often smaller and sharper.
Will compressing an image remove EXIF data?
Tools that redraw the image in the browser, like ours, generally do not copy EXIF metadata into the new file. Check if you need to keep it.