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Image Resizer

Resize any JPG, PNG, WebP, AVIF, or HEIC image by exact pixels, by percentage, or with one-click social-media presets for Instagram, Facebook, Twitter/X, YouTube, and LinkedIn — all in your browser, nothing uploaded.

Resizing happens in your browser — your image is never uploaded. Re-encoding strips EXIF/location metadata.

Understanding the Image Resizer

Image Resizer changes an image's pixel dimensions by exact width and height or by a preset (such as common social media or profile sizes). It is for anyone who needs a picture to fit a specific space: a forum avatar, a passport-style upload, a thumbnail, a banner, or an email attachment that must stay small. You can lock the aspect ratio to avoid stretching, or set custom dimensions. Resizing runs in your browser with the Canvas API, so the image never uploads and your privacy stays intact.

How it works

The image is loaded and painted onto an HTML Canvas sized to your target dimensions, then exported as a new image. When you keep aspect ratio locked, changing width recalculates height (and vice versa) using the original proportions so nothing distorts. Downscaling uses the browser's built-in image smoothing for clean results; presets simply fill in width and height for you. Export format and quality determine the final file size. Everything happens locally in JavaScript with no server round-trip. Remember that enlarging beyond the original pixel count interpolates new pixels and cannot add real detail, so it may look soft.

new_height = original_height * (new_width / original_width) (when aspect ratio is locked)

Worked example

You have a 1920x1080 photo and need a 600 px wide thumbnail without distortion. With aspect ratio locked, you type 600 for width; height auto-fills to 1080 * (600 / 1920) = 337.5, rounded to 338. The canvas redraws the image at 600x338 and exports it. The result keeps the original 16:9 look at a fraction of the size, ideal for a blog list or card layout, and the source file on your disk is untouched.

Tips & common mistakes

  • Keep aspect ratio locked unless you deliberately want to stretch or squash the image.
  • Downscaling is reliable; upscaling cannot recover detail and often looks blurry.
  • Match the exact pixel size a platform requests to avoid its own automatic, lower-quality crop.
  • Export to JPG or WebP for photos and PNG for graphics with sharp edges or transparency.
  • Note width and height swap meaning for portrait versus landscape, so check both fields before exporting.

Related tools

Bulk Image ConverterConvert, resize, and compress many JPG, PNG, or WebP images at once, then download as a ZIP.Image to Text (OCR)Extract text from images and scanned PDFs with in-browser OCR — no upload, supports 100+ languages.Image CompressorCompress JPG, PNG, and WebP images to a target file size or quality, right in your browser.Crop ImageCrop a photo to any aspect ratio or freeform selection, with live preview, in your browser.

Frequently Asked Questions

Is my image uploaded to a server?

No. Resizing happens entirely in your browser using the Canvas API. Your image never leaves your device.

Will resizing reduce quality?

Making an image smaller keeps quality high. Enlarging beyond the original size can look soft, since there is no extra detail to add. Locking the aspect ratio avoids stretching.

What are the presets for?

They set the exact dimensions for common social-media images (Instagram, Facebook, Twitter/X, YouTube, LinkedIn) so you do not have to look them up.

Can I resize an animated GIF?

You can upload a GIF, but the resized output is a single static frame (saved as PNG, JPG, WebP, or AVIF), not an animation. Browser canvas resizing cannot preserve GIF animation, so use a dedicated GIF tool if you need the animation kept.