How do I resize an image online?

Drag and drop your image onto the drop zone or click to browse. Enter your preferred width and height in pixels, or switch to percentage mode and use the slider. Keep Maintain aspect ratio on to avoid distortion, choose your quality and output format, then press Resize Image and download. Everything runs in your browser.

How do I resize an image without stretching or distorting it?

Keep the aspect-ratio lock enabled. When it is on, changing the width automatically recalculates the height (and vice versa), so the image keeps its original proportions. Only unlock it if you deliberately want to stretch the image to exact, non-proportional dimensions.

Can I resize an image by percentage?

Yes. Switch to By percentage mode and drag the slider from 10% to 200% of the original size. The output dimensions update live so you can see exactly what you will get before resizing.

Can I make an image larger (upscale)?

Yes, up to 200% - but enlarging cannot invent detail that the original never had, so upscaled images look softer. Downscaling (making images smaller) keeps them sharp. For big enlargements, dedicated AI upscalers give better results.

Does resizing reduce image quality?

Downscaling generally looks sharp because the browser blends pixels smoothly. The quality slider controls the JPG/WebP encoding of the output; PNG output is lossless. The before/after preview lets you compare the result with the original.

Which formats are supported?

JPG, PNG and WebP as input and output. You can keep the original format or convert while resizing - for example, resize a PNG and save it as JPG. PNG output preserves transparency.

Is this image resizer free?

Yes, completely free with no sign-up, no watermark and no limit on the number of images.

What sizes should I use for social media?

Common choices: 1080x1080 for Instagram posts, 1280x720 for YouTube thumbnails, 1920x1080 for full-HD covers and wallpapers. The tool includes one-click presets for these popular sizes.

What is the difference between resizing and compressing?

Resizing changes the pixel dimensions (width and height) of the image. Compressing keeps the dimensions but re-encodes the file to reduce its size in KB. If you need to hit an exact file size like 100 KB, use the Image Compressor instead - or resize first, then compress.

Image Resizer — Resize Images Online Free (Pixels or %, No Upload)

Q: Are my images uploaded to a server?

No. This resizer processes your image entirely inside your browser. Your file is never uploaded anywhere and never leaves your device, which makes it fast and completely private.

Add image

Resize

Save

Drop your image here

or click to browse · also supports paste · JPG · PNG · WebP

Converts on your device — nothing is uploaded

Resize by

Width & height —

Maintain aspect ratio is on — width and height stay in proportion, so nothing gets stretched.

Output quality 90

Applies to JPG and WebP output. PNG output is lossless (quality has no effect).

Output format

Image Original

Dimensions—

File size—

Format—

Type—

convert

—

Smaller Resized

Press Resize to generate the new size

Dimensions—

File size—

Format—

Scale—

✓ Saved to your device as image.jpg

Resize Images Online — Free, Private, In Your Browser

This image resizer changes the dimensions of your JPG, PNG and WebP images to exactly what you need — by precise pixel dimensions or by percentage — entirely in your browser. Your image is never uploaded to a server, never stored, and never seen by anyone. No sign-up, no watermark, nothing to install.

How to Resize an Image

Upload your image — drag and drop it into the upload area, click to browse, or paste from your clipboard.
Choose your dimensions — enter your preferred width and height in pixels, use a one-click preset, or switch to percentage mode and drag the slider.
Keep the original proportions — leave Maintain aspect ratio on to prevent your image from becoming stretched or distorted; type one dimension and the other follows automatically.
Adjust quality and format — pick the output quality and format: keep the original, or convert to JPG, PNG or WebP while resizing.
Download — press Resize Image, compare the result beside the original, and download instantly.

Pixels or Percentage — Which Should You Use?

Use pixel dimensions when a platform demands an exact size — a 1280×720 YouTube thumbnail, a 1080×1080 Instagram post, a website banner. Use percentage when you just want the image proportionally smaller or larger — “half size” is simply 50%, with the resulting dimensions shown live before you commit.

Common Image Sizes

Use	Size (px)	Notes
Full-HD wallpaper / cover	1920 × 1080	16:9
YouTube thumbnail	1280 × 720	16:9, under 2 MB
Instagram post	1080 × 1080	square 1:1
Blog / website content image	800–1200 wide	match your layout width
Email-friendly photo	640 × 480	small & fast

The most popular of these are built in as one-click presets under the width/height fields.

About Aspect Ratio (and Avoiding the “Stretched” Look)

The aspect ratio is the relationship between width and height. If you force a 4:3 photo into a 16:9 frame by typing both numbers freely, it will look stretched. With Maintain aspect ratio enabled (the default), the resizer recalculates the matching dimension for you, so the picture always keeps its natural proportions. Unlock it only when you deliberately need exact, non-proportional dimensions.

Making Images Larger — an Honest Note

You can scale up to 200%, and it works — but enlarging cannot invent detail the original never captured, so upscaled images look softer than true high-resolution ones. Downscaling, on the other hand, keeps images crisp: the browser’s high-quality smoothing blends pixels cleanly. If you need a big, sharp enlargement of a small image, a dedicated AI upscaler is the right tool.

Resizing vs Compressing — Which Do You Need?

Resizing changes the pixel dimensions (this page). Compressing keeps the dimensions and shrinks the file size in KB. They work brilliantly together: resize a 4000-pixel photo down to the 1200 pixels it will actually be displayed at, then compress it to your exact KB budget. If a form demands a file size like 100 KB, use the Image Compressor — it can hit an exact KB target automatically.

Is It Safe and Private?

Yes. Because everything happens locally in your browser, your image is never uploaded, never copied to a remote server, and never stored after you close the tab — safe for personal photos, ID documents and client work.

Popular Exact Sizes — One-Click Pages

Need one of the most-requested sizes? These dedicated pages come with the target already filled in — just drop your image and download:

Resize to 1920×1080 (Full HD wallpaper) · Resize to 1280×720 (YouTube thumbnail) · Resize to 1080×1080 (Instagram square) · Resize to 512×512 (icons & stickers) · Resize to 640×480 (email & forms)

More image tools: Working with PDFs? Try PDF to Word. Need several edits at once? Use the Image Studio. Need to cut part of a picture? Use Crop Image. Converting lots of files? Use the Batch Image Converter. Need an exact file size (20 KB, 50 KB, 100 KB)? Use the Image Compressor. Change format with JPG to PNG, PNG to JPG or JPG to WebP.

Frequently Asked Questions

How do I resize an image without stretching it?

Keep the aspect-ratio lock on. Type one dimension and the other is calculated automatically, so proportions never change.

Can I resize by percentage?

Yes — switch to Percentage mode and drag from 10% to 200%, with the output dimensions shown live.

Can I make an image bigger?

Up to 200%. Enlarged images look softer because no new detail can be invented — downscaling always stays sharp.

Can I change the format while resizing?

Yes — keep the original format or output JPG, PNG or WebP. PNG output preserves transparency.

Are my images uploaded to a server?

No. Resizing happens entirely in your browser — your image never leaves your device.

Is it free?

Completely free — no sign-up, no watermark, no limits.