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ConvertBox

Resize Image

Resize images by pixels or percentage with locked aspect ratio. Batch up to 50MB per file, JPG/PNG/WebP output — all processed in your browser.

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Select Image Files

You can resize multiple files at once

Max file size: 50MB • Multiple files allowed

or drag and drop · press Enter to browse

How to Use

  1. Upload one or more images to resize (phone screenshots, marketplace photos, or Instagram covers all work the same way)
  2. Pick a preset by platform: WhatsApp profile 640×640, Instagram post 1080×1080, LinkedIn cover 1584×396, resume photo 354×472
  3. Or enter custom width and height in pixels and decide whether to keep the aspect ratio locked
  4. Choose the output format: JPG for photos, PNG when you need transparency, WebP when page weight matters
  5. Click "Resize and prepare download" — everything runs in your browser and the image never reaches a server
  6. Review the preview and download images one by one or grab the whole batch as a ZIP for store uploads or social posts

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

Yes, the aspect ratio lock is enabled by default. You can disable it if you need custom dimensions.
There is no strict limit, but very large dimensions may slow down browser processing.
Yes, you can select and resize multiple images simultaneously using the same dimensions.
No. Canvas-based resizing runs entirely in your browser. Files never leave your device.
Downscaling is essentially lossless visually; upscaling beyond original dimensions will introduce blur. Use AI upscalers for that case.
Hundreds, processed sequentially. Each file must stay under ~50MB to avoid browser memory limits.
EXIF is stripped on output to protect privacy. If you need it preserved, use a metadata-aware tool before resizing.