Image Resizer

Need exactly 800×600, or a photo that fits a portal's dimension rules? This resizer changes image dimensions precisely — with aspect-ratio locking so nothing stretches — while keeping the result sharp.

Upload, type the width or height, preview, download. Like all our image tools, resizing happens on your device: fast, private and free.

How to Use This Tool (Step-by-Step Guide)

Upload. Select the photo. Its current dimensions are displayed.
Set new size. Enter width or height (aspect lock keeps proportions), or pick a preset.
Preview. Check the resized preview for sharpness and framing.
Download. Save in JPG or PNG and use it wherever exact size matters.

Key Features & Benefits

Exact pixelsType precise dimensions for portal requirements.

Aspect lockProportions preserved — no stretching, ever.

Sharp downscaleHigh-quality resampling keeps detail crisp.

Format choiceExport JPG for photos, PNG for graphics.

PrivateAll processing on-device.

FreeNo account, no limits.

Understanding Image Resizer

Resizing (resampling) recalculates every pixel for the new dimensions using high-quality smoothing, so downscaling a 4000px photo to 800px keeps it crisp — you are discarding excess detail, not damaging what remains. Upscaling (enlarging) cannot invent detail, so results soften: always start from the largest original available.

Locking aspect ratio prevents the classic stretched-face mistake: change width and height follows automatically. Export as JPG for photos, PNG for graphics — matching format to content, as with compression.

Batch consistency matters when one application needs several images: resize every photo for the same submission to identical dimensions so the set looks deliberate rather than assembled. Portals that auto-generate previews also behave better with uniform sizes, and equally-sized images compress to predictable file sizes, making it easier to stay under byte caps without repeated trial and error.

Pro Tips for Best Results

Always resize from the largest original, never from a thumbnail.
Check both dimensions AND file size against portal rules.
For profile pictures, crop square first, then resize.
Batch tip: resize all images for one application identically.

Frequently Asked Questions

Will resizing reduce quality?

Downscaling from a large original stays crisp. Upscaling beyond the original size softens — avoid enlarging more than ~1.5x for important images.

How do I keep proportions?

Keep aspect-ratio lock on (it is on by default): enter either width or height and the other follows automatically.

What size do portals usually want?

Common asks: 800×600 or under for uploads, file caps of 20–200 KB. Resize dimensions first, then compress to hit the byte cap.

JPG or PNG after resizing?

Photos → JPG; screenshots/logos/text → PNG. The tool lets you choose at download.

Are uploads private?

Yes — resizing runs on canvas in your browser; files never leave your device.

Security & Privacy Guarantee. Your privacy is guaranteed. All processing is done locally in your browser/deleted automatically from our servers after processing. Your files are never uploaded, stored or shared.

Works Everywhere You Do

This tool is fully responsive: identical features on Android, iPhone, tablets and desktops, with no app to install. Files stay on your device, results download straight to your downloads folder, and everything is free without an account.

Related Tools

→ Image Compressor → Image Crop

Explore all free tools → · Read how-to guides →

Try Image Resizer now — free forever

No signup · No watermark · Private by design

Open the tool ↑