Preview File Original (px) Aspect Size (KB) Target (px) Status
{{ f.name }} {{ f.originalWidth }}×{{ f.originalHeight }} {{ f.aspect }} {{ f.sizeKB }} {{ f.targetWidth }}×{{ f.targetHeight }} Download Processing… Pending
Set to 100 % to use exact width/height values instead.
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Categories: Image , Resizer
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The Image Resizer enables you to quickly scale single or multiple photographs to precise pixel dimensions without installing desktop software. Drag your files into the browser, define width, height, and quality, and obtain optimised images ready for web, social media, or presentations. Everything runs locally so your data remains private and processing completes nearly instantly.

Designed for content creators, marketers, and developers alike, the tool balances visual fidelity against file size while maintaining accurate aspect ratios. It supports common raster formats including JPEG, PNG, and WebP, automatically adjusting encoding parameters to achieve target quality. Individual downloads or a consolidated ZIP archive streamline handoff to content management systems, email clients, or asset pipelines.

Behind its minimalist interface lies a high-performance scaling engine that leverages progressive sampling and sub-pixel interpolation to produce sharp results, even when downscaling dramatically. An interactive table previews original and target dimensions, approximate file savings, and real-time processing status, helping you decide on optimal export settings. These features collectively accelerate image preparation workflows across creative and technical projects.

Technical Details

The following highlights outline functional and performance aspects relevant to professional image processing workflows.

  • Drag-and-drop interface with instant thumbnail previews and metadata extraction.
  • Supports JPEG, PNG, and WebP input and output for broad compatibility.
  • Adjustable width and height fields with optional aspect-ratio lock for proportional scaling.
  • Quality slider ranging from 10 % to 100 % for lossy formats to balance fidelity and size.
  • Batch processing engine with per-file progress states and real-time status updates.
  • One-click Resize All action followed by individual or consolidated ZIP downloads.
  • Displays original and target dimensions, aspect ratio, and estimated file-size savings.
  • All operations execute entirely in the browser, ensuring privacy and zero server transfer.
  • Deterministic output filenames aid automated asset management and version control.
Quality (%) Typical Size Reduction Recommended Use Case
100≈0 %Print-ready archiving
90≈15 %High-resolution displays
75≈35 %General web content
60≈55 %Blog thumbnails
40≈70 %Mobile bandwidth saving
 
<img src="resized-landscape.jpg" width="800" height="450" alt="Optimised landscape image">

Step-by-Step Guide

Follow these steps to obtain optimally sized images for any publishing scenario.

  1. Click the Drop Zone or drag files directly onto it to enqueue images.
  2. Review each entry in the preview table to confirm name, original dimensions, and size.
  3. Enter desired Width and/or Height values; leave one blank to auto-scale.
  4. Toggle Maintain ratio to preserve proportions Tip.
  5. Select output Format and adjust the Quality slider for lossy compression.
  6. Press Resize All to start processing; progress indicators will appear beside each file.
  7. Click the green Download links or the Download ZIP button when available Done.

FAQ

The answers below address frequent queries about efficiency, compatibility, and output integrity.

Does the tool upload my images to a server?

No. All resizing operations execute locally in your browser, ensuring complete data privacy.

Why is the Quality slider disabled for PNG?

PNG is a lossless format; quality settings do not apply. The slider is therefore intentionally inactive.

How many images can I process at once?

You can enqueue dozens of images, but performance depends on your device’s memory and processor capacity.

Will aspect ratio be preserved automatically?

Yes, when Maintain ratio is checked. Clearing the option allows free-form scaling.

What happens if width and height are both empty?

The tool defaults to original dimensions, effectively acting as a format or quality converter only.

Troubleshooting

Refer to the checklist below when outcomes differ from expectations.

  • Blank previews – Ensure the selected files are images and not corrupted.
  • Download link missing – Wait for processing to complete; status must read Done.
  • ZIP archive fails to open – Re-download and verify that your unzip utility supports ZIP64.
  • Images appear blurry – Increase output quality or target dimensions to reduce down-sampling artifacts.
  • High memory usage – Reduce batch size or process images in smaller groups.

Advanced Tips

Apply these professional techniques to maximise workflow efficiency.

  • Use power-user shortcuts: press Ctrl + O to open the file picker instantly.
  • Set only one dimension to let the tool calculate the other for perfect proportional scaling.
  • Combine multiple format conversions in one pass by mixing PNG and JPEG inputs.
  • Lower JPEG quality below 60 % for thumbnails; the perceptual impact is minimal but savings are large.
  • Rename output files automatically in your operating system by prefixing a project code during import.

Glossary

The definitions below clarify terminology used throughout the interface.

Aspect Ratio
The proportional relationship between width and height of an image.
Lossless Compression
Encoding that preserves all original data, producing identical output after decoding.
Lossy Compression
Encoding that discards certain data to reduce file size at the expense of some fidelity.
Thumbnail
A small preview version of an image, typically used to represent larger content.
ZIP Archive
A single compressed file containing one or more files, facilitating bulk download.
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