Image compressor
Make photos and screenshots smaller without uploading them anywhere. Choose a quality, optionally cap the width, and download each image or all of them as a ZIP. A before-and-after size is shown for every file.
About the image compressor
Make photos and screenshots smaller without uploading them anywhere. Choose a quality, optionally cap the width, and download each image or all of them as a ZIP. A before-and-after size is shown for every file.
Part of SmartCalcy’s files, images & design tools. It runs in your browser with no account, uses your own currency and units (change them at the top of the page), and gives estimates for information only, so check official guidance before you rely on a result.
How to use the image compressor
What it calculates and when to use it
Makes JPG, PNG and WebP images smaller for email, websites and upload forms, in a batch and without uploading them. Each image shows its size before and after.
How to use it, step by step
- Drop images on the page or choose them.
- Set the quality and, optionally, a maximum width.
- Choose whether to keep the format or save as JPG or WebP.
- Download each image or all of them as a ZIP.
What each input means
- Quality – 60–80% suits most photos. Starts at 70%.
- Maximum width – Optional; wider images are scaled down.
- Save as – Same format, JPG or WebP.
How to read the results
- Total saving – Percentage and bytes saved across all images.
- Table – Each image’s size before and after, its dimensions and a download button.
The formula
Each image is redrawn at the chosen size and re-encoded at the chosen quality. If the result would be larger than the original, the original is kept.
A worked example
A 4,000 × 3,000 pixel phone photo of about 4 MB, capped at 1,600 px wide at 70% quality, typically comes out at around 200–400 KB, a saving of over 90%.
Assumptions and limits
- PNG is lossless, so the quality setting does not apply to PNG output; saving screenshots as WebP or JPG shrinks them most.
- Photo metadata such as location is removed when an image is re-encoded.
Common mistakes
- Compressing the same image repeatedly, which adds visible artefacts.
- Saving logos and screenshots with sharp text as low-quality JPG.
Frequently asked questions
Are my photos uploaded?
No. Compression happens in your browser.
What quality should I use?
Start at 70%. Go lower for thumbnails, higher for photos you will print.
Does it remove location data?
Yes, re-encoded images do not keep EXIF metadata such as GPS position.