Online image resizer without quality loss

Resize images online in seconds. Batch process photos, increase image resolution for web or print, and export sharp results with zero uploads.

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Drag & drop images or click to browse

PNG, JPG, WebP

Online image resizer

Resize photos online and keep every pixel sharp

OneImage is a free online image resizer for PNG, JPG, and WebP files. Resize images online, increase image resolution, and prep photos for Instagram, web, or print without quality loss.

Supports pixel sizes or percentage scaling with transparent PNGs, color profiles, and aspect ratio safety.

Resize images online in seconds

Change width and height directly or scale by percentage to fit web, print, and presentation requirements.

Increase image resolution without blur

Upscale low-resolution photos, keep edges smooth, and avoid pixelation when you need clearer, high-definition exports.

Ready for social and batch workflows

Save presets for Instagram 1080x1080 posts, 1080x1920 stories, or any custom size, and run batch exports across every photo.

Why creators love this resizer

Built for designers, marketers, and product teams who need fast, reliable exports for web, print, and social uploads.

Batch ready

Process a gallery of images at once. Everything runs locally so your files stay on your device.

Flexible controls

Switch between exact pixel dimensions or percentage-based scaling with aspect ratio locking.

Reusable presets

Save your favourite export sizes to the browser and recall them instantly next time.

How to resize images with OneImage

Resize images online without losing clarity. Use presets, aspect locks, and batch processing to keep every photo crisp.

Upload one or many photos

Drag images into the drop zone or click the button to browse. Files are processed locally.

PNG, JPG, and WebP files up to 25 MB each are supported.

Choose resize mode

Pick fixed pixel dimensions or percentage-based scaling depending on your export needs.

Enable aspect ratio lock to avoid distortion when targeting specific widths.

Configure presets

Select a built-in preset or save a custom size to reuse later.

Presets are stored in the browser so your favourite sizes load instantly next session.

Process and download

Click Resize images to generate results for the entire batch, then download individually or all at once.

Processed images keep the original format whenever possible.

How the resizing engine works

The online image resizer renders each image into an off-screen canvas using your chosen dimensions or scale factor. With aspect ratio lock enabled, widths are honoured and heights are calculated from the original ratio to avoid stretching. Smart resampling keeps edges clean so you can increase image resolution or shrink photos without blur, then export back to the same format for quick downloads.

More resizing guides

Targeted workflows for resolution boosts, social media sizing, and batch runs.

Increase image resolution online

Make a blurry or low-resolution photo clear with our image upscaler and tips to keep detail sharp.

Open resolution guide

Resize image for Instagram

Use the Instagram photo resizer presets like 1080x1080 posts or 1080x1920 Stories to fit every upload.

Resize for Instagram

Batch image resizer

Resize multiple images at once with unified dimensions or percentage scaling for every file.

Use batch resizer

Frequently asked questions

Answers to common questions about the OneImage image resizer and resolution workflows.

How do I resize images online without losing quality?

Use the width/height inputs or percentage scaling with aspect ratio lock on. The tool resamples pixels cleanly so photos stay sharp instead of stretching or pixelating.

Can I increase image resolution with this resizer?

Yes. Set a larger target size or scale above 100% to upscale a low-resolution picture. The canvas-based exporter keeps edges smooth while adding pixels for clearer results.

How do I resize photos for Instagram sizes?

Choose exact pixel dimensions like 1080x1080 for Instagram posts or 1080x1920 for Stories. You can save these presets so every social upload matches platform requirements.

Can I resize multiple images at once?

Yes. Upload a batch, set the target size, and generate resized versions for every file in one click. You can even add multiple export sizes to process all variants together.

Is the image resizer free and private?

All processing runs locally in your browser, so photos never leave your device. The OneImage resizer is free to use for both single images and batch exports.