Image Resizer

Image Resizer

Resize Mode
Target widths (px)

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Workflow & Usage

  1. Add images: Drag & drop or click to select one or more JPG, PNG, or WebP files. You’ll see quick previews and a progress bar when processing.

  2. Choose a resize mode:

    • Fixed widths: enter widths like 1600,1200,800.
    • Scale (%): enter percentages like 200,100,50.
    • Fit inside (W×H): set a max width and height; images are scaled to fit while keeping aspect ratio.

  3. (Optional) Background color for JPEG: If your source has transparency and you’re exporting JPEG, pick a solid background to blend transparent areas cleanly.

  4. Run & review: Click Resize per image (or Download all as ZIP to run everything). Each image shows its generated outputs with filenames like photo-1600x1200.jpg.

  5. Download:

    • Per output: click Download next to any file.
    • Everything at once: click Download all as ZIP to get neatly organized folders per source image.

Use Cases

  • Responsive images for the web Generate 2000/1600/1200/800/400 widths for <img srcset> in seconds.

  • Thumbnails & previews Create consistent small sizes for galleries, blogs, or CMS cards.

  • Newsletters & socials Fit images into layout boxes without guessing.

  • Batch prep for e-commerce Produce uniform product image dimensions before uploading.

  • Metadata cleanup Canvas re-rendering removes camera metadata for lighter, privacy-friendly files.

Tips for Best Results

  • Pick practical breakpoints. For most sites, 1600, 1200, 800, 400 px cover common viewports.
  • Don’t overscale. Avoid upscaling tiny originals; it won’t add detail and wastes bytes.
  • Combine with compression. After resizing, run images through the Image Compressor or Progressive JPEG Converter to cut file size further.
  • Name hygiene. Outputs include dimensions in the filename (e.g., hero-1200x800.jpg) — great for organizing and caching.

How It Works

This tool is built for speed and privacy, using modern browser tech:

  • Web Workers (with a small pool). handle images in parallel so the UI stays snappy while batches process.
  • createImageBitmap + OffscreenCanvas perform fast, high-quality resampling with imageSmoothingQuality: 'high'.
  • Geometry-only resizing means no quality parameter — it simply renders at your requested dimensions and preserves the input format.
  • Smart targets deduplicate identical sizes to avoid redundant work.
  • ZIP packaging via JSZip bundles all outputs into a tidy download — no uploads, no servers, fully client-side.

Frequently Asked Questions

JPG, PNG, and WebP. The tool preserves the original format by default (PNG in, PNG out; JPG in, JPG out; etc.).

No. This tool focuses on geometry (dimensions) only. If you need compression or quality tweaks, pair it with the Image Compressor or Progressive JPEG Converter.

JPEG doesn’t support alpha. You can set a background color to blend any transparent pixels before export so you avoid black or checkerboard edges.

No. Rendering through Canvas strips metadata. This is often desirable for privacy and size, but if you need metadata editing, use a dedicated metadata tool.

It runs entirely in your browser, so limits depend on your device’s memory/CPU. For very large batches, process in smaller chunks.

Yes, once loaded (as a PWA), it can run offline because everything happens on-device — no uploads, no servers.

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