How to resize an image
- Drop your images into the box above, or click it to pick files. You can also paste with
Ctrl+V. - Choose how the size is applied. Longest side keeps the aspect ratio and is what you want most of the time.
- Pick a format. Keep format leaves JPEG as JPEG and PNG as PNG.
- Download single images, or all of them at once.
Which size do I need?
| Use | Longest side |
|---|---|
| Email attachment | 1200 px |
| Blog or website image | 1600 px |
| Full-width hero image | 2400 px |
| Print at 300 dpi, A4 | 3500 px |
| Social media post | 1080 px |
Quality and file size
JPEG quality is a trade-off, not a switch. Below 70 the compression starts to show around edges and text. Between 80 and 90 almost nobody sees a difference, and the file is far smaller than at 100. The default here is 88.
Longest side never enlarges an image. Scaling a 800 px photo up to 1600 px adds pixels but no detail, so the tool leaves it alone. Use width, height or exact if you really need a larger canvas.
PNG ignores the quality slider: it is lossless. If a PNG photo feels too heavy, convert it to JPEG or WebP instead.
Why nothing is uploaded
The resizing runs in your browser with the standard canvas API. Your files never travel across the network, which is why there is no size limit, no queue and no account.
Questions
Does this reduce the file size too?
Yes. Fewer pixels means a smaller file, and lowering the quality slider shrinks it further. A 4000 px photo at 1600 px typically drops to a tenth of its size.
Can I resize many images at once?
Yes, up to 30 files per batch. Every file is processed with the same settings and you can download them individually or all at once.
Are my photos uploaded to a server?
No. The tool runs entirely in your browser. Nothing leaves your device.
What about transparency?
PNG and WebP keep transparency. JPEG cannot store it, so transparent areas become white.