Image Resizer

Resize images online to exact pixel dimensions or a target file size in KB. Bulk resize, lock aspect ratio, crop, and use social media presets, free, in your browser.

Resize any image by exact pixels, by percentage, or by cropping a selection, all in your browser. Bulk-resize a whole folder to a ZIP, hit an exact file size in KB, lock the aspect ratio, snap to social-media presets (Instagram, YouTube, TikTok, Facebook, X, LinkedIn), rotate, flip, and crop, then export as PNG, JPG, or WebP. Nothing is uploaded.

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Category
Image Tools
Includes
8 features
Access
Free · No sign-up
Privacy
Runs in your browser
Image Resizer

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Overview

Resize images to exact dimensions

Set a target width and height, or scale by percentage, to resize any image precisely, with the option to keep the aspect ratio so nothing looks stretched. When the target box has a different shape, choose Fill (crop to cover), Fit (letterbox with a background color), or Stretch. It's ideal for meeting upload limits, fitting layouts, or preparing platform-specific sizes.

Included

Features

01
Resize by exact pixels, percentage, or crop selection
02
Bulk resize many images at once and download as a ZIP
03
Resize to a target file size in KB (auto quality tuning)
04
Fill / Fit / Stretch modes when the target ratio differs
05
Aspect-ratio lock + 8 social-media presets + crop ratios
06
Rotate any angle, flip, and set a background color
07
Export PNG, JPG or WebP with before/after size readout
08
High-quality resampling: 100% client-side, no uploads
How to use

How to use Image Resizer

  1. 01

    Upload an image

    Drag and drop or click to select any photo, screenshot, or graphic.

  2. 02

    Choose how to resize

    Pick Pixels for an exact width/height (with optional aspect lock and Fill/Fit/Stretch), Scale for a percentage, or Crop to drag a selection box with aspect-ratio presets. Drop several images to switch into batch mode.

  3. 03

    Transform & format

    Rotate to any angle or flip, choose PNG, JPG, or WebP, then set quality, or switch to Target KB to hit an exact file size.

  4. 04

    Apply & download

    Hit Apply to preview a single image with a before/after size comparison, or Resize all to process a batch and download every image as a ZIP.

Use cases

Common use cases

  • -Resize a photo to 1080×1080 for an Instagram post
  • -Make a 1280×720 YouTube thumbnail from any image
  • -Bulk resize a folder of product photos and download a ZIP
  • -Compress a JPG under a 200 KB upload limit with Target KB
  • -Scale a large photo down by 50% for faster loading
  • -Crop a headshot or product shot to an exact 1:1 or 16:9 frame
  • -Fit an image under a site or form upload dimension limit
Guide

Detailed guide

Bulk resize and resize to an exact file size

Drop several images at once to batch-resize them all to the same box and download the whole set as a single ZIP, perfect for product photos or a folder of social posts. Need to fit a strict upload limit? Switch to Target KB and the resizer binary-searches the JPG or WebP quality to land just under the size you set, so you never have to guess a quality percentage.

Fast, private, and lossless where it counts

Because resizing happens entirely in your browser, there are no uploads, no watermarks, and no waiting on a server. Prepare avatars, thumbnails, and hero images at the correct dimensions in seconds, even for sensitive photos.

FAQ

Frequently asked questions

How do I resize an image online for free?+

Upload your image, enter the desired width and height in pixels (or choose a social media preset), and click Apply. Download the resized image instantly, no software or signup needed, and nothing is uploaded to a server.

Can I resize multiple images at once?+

Yes. Drop several images together and the tool switches into batch mode, it resizes them all to the same box using your chosen settings, then lets you download every result as a single ZIP file. You can add more images to the batch or remove any before processing.

How do I resize an image to an exact file size, like under 100 KB?+

Choose JPG or WebP as the output format, switch the quality control to 'Target KB', and enter your limit (for example 100). The resizer automatically tunes the compression quality so the exported file lands just under that size, ideal for upload limits.

What size should I resize images for Instagram?+

Instagram optimal sizes: Square post = 1080×1080px, Portrait = 1080×1350px, Story/Reel = 1080×1920px. Use the Instagram presets in the tool for automatic sizing.

How do I resize an image without stretching it?+

Keep the 'Locked' aspect-ratio toggle on so width and height scale together. If you need an exact box that has a different shape, unlock the ratio and pick Fill (crop to cover the box), Fit (letterbox with a background color), or Stretch.

Can I crop and rotate while resizing?+

Yes. Crop mode lets you drag a selection box with aspect-ratio presets (1:1, 4:3, 16:9 and more), and the Transform controls rotate to any angle and flip horizontally or vertically before you export.

Will resizing make my image blurry?+

Resizing down (making smaller) generally maintains sharpness thanks to high-quality resampling. Resizing up (making larger than the original) introduces some blurriness because the tool has to invent pixel data that was never captured.

What size should I use for a YouTube thumbnail?+

YouTube thumbnails should be 1280×720px (16:9 aspect ratio). File size must be under 2MB, use the YT Thumb preset, then switch to Target KB if you also need to stay under a size limit. JPG format works best for thumbnails.

How do I resize an image to exact pixels, like 1920x1080?+

Enter the target width and height in pixels (for example 1920x1080) and download. You can lock the aspect ratio to avoid stretching, or unlock it to force exact dimensions.

How do I resize a photo to a specific file size in KB?+

Switch to target-size mode and enter the KB you need; the tool adjusts dimensions and quality to land near that size, which is ideal for upload forms with strict limits. Resizing runs in your browser, so nothing is uploaded.

What size should I resize an image to for Instagram or a YouTube thumbnail?+

Common targets: Instagram post 1080x1080, Instagram story 1080x1920, YouTube thumbnail 1280x720, and LinkedIn banner 1584x396. Enter the dimensions you need and export at the right size for the platform.

Can I resize without stretching?+

Yes: lock the aspect ratio and the tool scales width and height together so the image keeps its proportions.

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