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A complete, private, in-browser tool to resize, crop, convert, optimise and watermark images — with real Lanczos scaling, one-click platform presets and batch processing.
By width, height, exact dimensions, percentage, longest edge, shortest edge, target file size or smart web — with fit, fill (crop) and stretch.
A true Lanczos resampler for razor-sharp downscales and clean upscales, plus bicubic, bilinear and nearest-neighbour.
Instagram, Facebook, X, LinkedIn, Pinterest, YouTube, TikTok, wallpapers, favicons and Amazon/Etsy/Shopify product sizes.
Export JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, ICO or PDF. Convert PNG to WebP, JPG to AVIF, image to PDF and more while you resize.
Free, fixed-ratio, circle and centre crop, plus rotate, flip, exposure, gamma, brightness, contrast, saturation, denoise, blur and sharpen.
Add a text or logo watermark with adjustable position, opacity, scale, rotation and tiling — applied across an entire batch.
Resize hundreds of images or a whole folder at once with shared settings and a single ZIP download.
See the new file size and percentage saved before you download, so you hit your target every time.
Images are processed in your browser with Canvas — never uploaded, stored or sent anywhere.
An image resizer changes the pixel dimensions of a picture — its width and height — to make it larger or smaller. Resizing is the single most effective way to control an image's file size, load time and compatibility with a given platform.
This resizer runs entirely in your browser. It decodes your image onto an HTML canvas, resamples it to the dimensions you choose using high-quality algorithms (including a real Lanczos filter), optionally crops, rotates, watermarks and colour-corrects it, then re-encodes it to the format you select. Because the work happens locally, your images are never uploaded.
You can resize a single photo, convert it to a more efficient format like WebP or AVIF, or batch-process an entire folder — all while previewing the result and the new file size before you download.
Oversized images are the number-one cause of slow web pages. A photo straight from a phone or camera can be 5,000 pixels wide and several megabytes — far more than any screen needs. Resizing it to the size it is actually displayed makes pages load faster, improves SEO and saves bandwidth.
Resizing also makes images fit where they need to go: a square for an Instagram post, a wide banner for a website hero, a precise pixel size for a marketplace listing.
These four operations are related but distinct. The best results usually combine them — resize to the right dimensions, then compress and convert format to optimise.
When you shrink an image, the resizer must combine many source pixels into each output pixel; when you enlarge it, it must invent pixels in between. The resampling algorithm decides how. Nearest-neighbour is fastest but blocky; bilinear is smooth but soft; bicubic is sharper; and Lanczos (a windowed sinc filter) gives the cleanest results for both downscaling and upscaling.
For downscaling, a good filter prevents the jagged edges and moiré patterns that cheap resizers produce. For upscaling, Lanczos plus a light sharpen keeps edges crisp instead of blurry. This tool premultiplies alpha during Lanczos resampling so transparent edges stay clean.
After resizing, the image is re-encoded. Choosing WebP or AVIF instead of JPG or PNG often halves the file size at the same visual quality — and re-encoding strips EXIF metadata, removing location and camera data automatically.
Drag in one image, many images, a folder or a ZIP — or click to browse. JPG, PNG, WebP, AVIF, GIF, BMP, SVG and ICO are read instantly. Nothing is uploaded to a server.
Set an exact width and height, a percentage, a longest edge, or pick a one-click preset for Instagram, YouTube, a website hero or a product photo. Lock the aspect ratio to avoid distortion.
Compare the original and resized image side by side, watch the live file-size estimate, and fine-tune quality, format, cropping, watermark and colour adjustments.
Export a single image, or batch-process everything and download a ZIP. Convert to WebP or AVIF on the way out for the smallest possible file. EXIF metadata is stripped automatically.
| Algorithm | Quality | Speed | Best for |
|---|---|---|---|
| Lanczos | Excellent | Moderate | Photos, downscaling, high-quality upscaling |
| Bicubic (high) | Very good | Fast | General-purpose resizing with smooth gradients |
| Bilinear | Good | Very fast | Quick previews and modest size changes |
| Nearest neighbour | Pixelated | Instant | Pixel art and sharp-edged graphics |
Hit exact Instagram, TikTok, YouTube and Pinterest dimensions in one click and keep every post pixel-perfect.
Resize and convert featured images to WebP so articles load fast and rank better in search.
Standardise product photos to Amazon, Etsy and Shopify sizes for clean, consistent listings.
Export assets at multiple sizes and retina @2x, with precise crops and transparent backgrounds preserved.
Downscale high-resolution shots for web galleries and client previews without losing sharpness.
Batch-produce campaign assets in every required size with consistent watermarks and branding.
Generate favicons, Open Graph images and responsive image sets, and automate the rest with the API.
Process whole client folders at once and deliver optimised, correctly-sized assets in a single ZIP.
Your images never leave your device. Decoding, resizing, conversion and watermarking all run in your browser.
Images are decoded and resized on a canvas in your browser. They never touch a server.
Personal and client images are processed locally, so nothing private is transmitted.
Re-encoding removes location, camera and timestamp metadata automatically.
With no data leaving the device, there is nothing to store, leak or comply over.
A separable windowed-sinc filter with premultiplied alpha for sharp, artefact-free downscaling and upscaling.
Hardware-accelerated 2D rendering decodes, transforms and re-encodes images directly in the browser.
Native canvas encoders output modern formats that beat JPG/PNG on quality-to-size — feature-detected per browser.
Re-encoding to a fresh bitmap discards embedded metadata, protecting privacy by default.
Crop, rotate and flip are applied with canvas transforms before resampling for predictable, lossless geometry.
A trial encode measures the exact output size so the savings you see are the savings you get.
Cutting dimensions to what is actually displayed saves far more than quality tweaks alone — do it first.
For the web, WebP and AVIF typically halve file size versus JPG/PNG at the same visual quality.
Pick Lanczos for the cleanest downscales and the sharpest upscales; use nearest-neighbour only for pixel art.
Keep the ratio locked unless you deliberately want to stretch — it prevents squashed, distorted images.
Fit keeps the whole image (with optional padding); fill crops to completely cover the target dimensions.
Apply one preset to a whole folder to produce a consistent set of platform-ready images in seconds.
Automate image processing at scale with a REST API: resize, crop, upscale, optimise, watermark and convert formats, with batch processing, async jobs, webhooks, API keys, team accounts and usage analytics.