Resize Images
Resize to exact pixels, a percentage or a longest side, with Lanczos3 and Magic Kernel resampling. Batch ready. Pick exact pixels, a percentage or a maximum side, and choose how to handle images with a different shape.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JPG, PNG, WebP, HEIC, AVIF, GIF, TIFF, SVG, RAW, PSD, JXL, BMP, ICO and more
How to use Resize Image
- 1
Drop your images, choose files, or paste from the clipboard.
- 2
Adjust the options.
- 3
Click Resize. Files are processed on your device.
- 4
Download each result or everything as a ZIP.
Why use Aback Images for resize image
Proper resampling
Lanczos3, Mitchell, Catmull-Rom and Magic Kernel Sharp filters from Squoosh, plus nearest-neighbour for pixel art.
Fit, fill, pad or stretch
Keep proportions, crop to fill an exact box, or pad with a blurred or solid background.
Whole batches
Resize hundreds of photos at once and download them as a ZIP. Animated GIFs stay animated.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
Related tools
One click sizes for Instagram, Facebook, X, LinkedIn, YouTube, TikTok, Pinterest, WhatsApp and more.
Enlarge photos with Magic Kernel Sharp or Lanczos and detail enhancement, or pixel art with hqx.
Fit any photo into a square with a blurred, coloured or transparent background. No cropping.
Set 72, 150, 300 or any DPI losslessly for JPG and PNG without touching the pixels.
Exact pixel sizes and KB limits for passports, visas and exam forms (US, UK, EU, India PAN, SSC, IBPS, UPSC).
Make thumbnails at exact sizes such as 150×150, 320×180 or 640×360, cropped or padded, as WebP, JPG, PNG or AVIF. In bulk.
Enlarge sprites and pixel art by whole-number factors with crisp nearest-neighbour pixels or Scale2x smoothing. GIFs stay animated.
Resize screenshots to the exact sizes App Store Connect and Google Play ask for, from 6.9-inch iPhone to 13-inch iPad and feature graphics.
Guides
How to compress an image without uploading it
Make photos and graphics smaller in your browser: which preset to pick, why resizing often saves more than quality, and what compression cannot fix.
3 min read
How to reduce JPG file size
Practical ways to shrink JPEG photos: the quality range that still looks the same, why the encoder matters, resizing, and when to switch to another format.
2 min read
How to optimise images for a website, and how large they should be
Pixel sizes for common layouts, sensible file size budgets, the right format for each kind of image, and the loading attributes that make pages feel fast.
2 min read
Responsive images with srcset and sizes, explained
Serve the right image width to each screen: how srcset and sizes work, which widths to generate, and how picture adds AVIF and WebP with a fallback.
2 min read
Frequently asked questions
Will resizing make my photo blurry?
Downscaling with Lanczos3 keeps images crisp. Enlarging beyond the original size cannot add real detail, so turn on Never enlarge to avoid soft results, or use the Upscale tool for better enlargement.
What is the difference between fit and fill?
Fit keeps the whole image inside your box, so one side may be smaller. Fill covers the whole box exactly and crops what does not fit. Pad keeps the whole image and fills the gaps with a background.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.