Image Resizer
Resize JPEG, PNG and WebP images by exact pixels or percentage. Lock aspect ratio to prevent distortion — nothing leaves your browser.
Resize Image
Free Image Resizer — No Upload Required
This tool resizes images entirely inside your browser. Your files never leave your device — there's no server, no storage, and no account required. Supports JPEG, PNG and WebP and preserves the original format in the output.
Use pixel mode when you need an exact size — like a 1200×630 social media banner or a 800×600 product image. Use percentage mode when you just want to scale down — like making an image half its original size for faster loading.
Frequently Asked Questions
Will resizing an image reduce its quality?
Making an image smaller (downscaling) has no visible quality loss. Making it larger (upscaling) will look blurry because the browser has to invent pixels that weren't there — it's always better to start from a larger original.
What does locking the aspect ratio do?
It keeps the width-to-height ratio the same as the original so the image doesn't look stretched or squashed. When locked, changing the width automatically calculates the correct height and vice versa.
What format will the resized image be saved as?
The output format matches your input — a JPEG stays JPEG, a PNG stays PNG, a WebP stays WebP. If you need to change the format, use one of the converter tools below.
Is my image uploaded to a server?
No. Everything runs in your browser using JavaScript and the Canvas API. Your image never leaves your device, making this completely private.
What's the maximum image size supported?
Up to 20 MB input and up to 16,000 × 16,000 pixels output. Very large canvases may be slow on older devices.
More Image Tools