Image Resizer Online – Resize Images by Pixels, Percentage & More

100% Private Runs in Your Browser Pixels · % · Presets Free & Unlimited

Image Resizer

Resize images to any dimension instantly — by exact pixels, width, height, percentage or social-media presets, with aspect-ratio lock, live preview and high-quality resampling. Fully in your browser: no uploads, no servers, no sign-up.

1. Upload Images

Drag & drop your images here

or

Browse Files

JPG, PNG, WEBP, BMP, GIF & AVIF where your browser supports them · Maximum 50 MB per file · Up to 50 images per batch

…or choose files from your device

Selected images 0

Click a thumbnail to preview it with your current resize settings. Status badges update during processing.

2. Resize Settings

Resize method By Width By Height By Width & Height By Percentage Preset Dimensions

Preset dimensions Instagram Square — 1080 × 1080 Instagram Portrait — 1080 × 1350 Instagram Story — 1080 × 1920 Facebook Post — 1200 × 630 YouTube Thumbnail — 1280 × 720 Twitter/X Post — 1200 × 675 LinkedIn Post — 1200 × 627 ────────── HD — 1280 × 720 Full HD — 1920 × 1080 4K UHD — 3840 × 2160

With aspect ratio locked, the image fits inside the preset without distortion. Unlock to force the exact preset size.

Width (px)

Height (px)

Scale (%)

%

Lock aspect ratio

Locked: dimensions fit inside the box with no distortion. Unlocked: exact values are used and the image may be stretched.

Output format Original Format JPG PNG WEBP AVIF

Output quality 90%

Applies to JPG, WEBP and AVIF. PNG is lossless — quality doesn't apply to it.

Filename suffix

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Upload an image and click its thumbnail to see the live resize preview here.

Live preview —

Original

Resized (live)

Original: — Target: — — Est. size: —

Resizing uses high-quality stepped resampling for smooth results. Upscaling adds no real detail (you'll see a warning). Dimensions are clamped to 1–10000 px. JPG output cannot store transparency — transparent areas become white.

Resized locally — your images never leave this device.

Resizing…

Validating images…

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3. Resized Results

How To Resize an Image

Step 1

Upload one or multiple images using drag & drop or the file browser.

Step 2

Choose a resize method — by width, height, exact pixels, percentage or a preset.

Step 3

Enter the dimensions or pick a preset like Instagram or Full HD.

Step 4

Keep aspect ratio locked if you want proportions preserved — unlock only for deliberate stretching.

Step 5

Choose output format and quality — watch the live preview and estimated size update instantly.

Step 6

Click Resize Image, review the results, then download individually or as a ZIP.

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Quality you can trust: strong downscales use stepped halving before the final pass — noticeably smoother than a single naive resize. Upscaling is allowed but flagged honestly: no tool can invent detail that isn't there.

100% local processing: resizing happens entirely inside your browser using the Canvas API. Images are never uploaded, transmitted or stored — and your original files are never modified.

Frequently Asked Questions

Your image is decoded in the browser, rendered to a canvas at the exact target dimensions using high-quality resampling, and re-encoded to your chosen format — a genuinely new image file, never a metadata trick.

Yes — completely free and unlimited. No registration, no watermarks and no hidden limits.

No. All resizing runs locally inside your browser. Files never leave your device — the tool keeps working even without an internet connection once loaded.

Locked (recommended): your image fits inside the entered dimensions with its proportions intact — nothing is stretched. Unlocked: the exact width and height you enter are forced, which changes the aspect ratio and visibly distorts the image if the proportions differ.

Downscaling keeps images looking sharp — the tool uses stepped halving for smooth results. Quality loss mostly comes from the export format: JPG at 90% is visually near-identical, while PNG is lossless. Upscaling can never add real detail, which is why the tool warns you when it happens.

Inputs: JPG, JPEG, PNG, WEBP, BMP, GIF and AVIF wherever your browser decodes them. Outputs: original format, JPG, PNG, WEBP and AVIF — with unsupported encoders clearly labelled and disabled automatically.

Yes — the Preset method includes Instagram Square/Portrait/Story, Facebook, YouTube thumbnail, Twitter/X and LinkedIn sizes plus HD, Full HD and 4K. With aspect ratio locked, your image fits inside the preset frame without distortion; unlock it to force the exact platform size.

Yes — up to 50 images per batch. The same resize rule is applied to every image (each keeps its own proportions), processed sequentially with live status, then downloadable individually or as a single ZIP.

Enlarging an image spreads the same pixels over more space — no software can recreate detail that was never captured. The result is valid and often useful (e.g. meeting a minimum size requirement), but it will look softer, so the tool tells you honestly rather than pretending otherwise.

Almost always — fewer pixels means a smaller file. The live panel even shows an estimated output size before you commit, calculated from a real encoded sample. Exact final sizes appear on every result card.

Absolutely. The layout stacks on small screens, all inputs are touch-sized, previews never overflow the viewport, and it works in modern mobile browsers on Android and iOS.

Never. Originals are only read from disk — resized copies are brand-new files with generated names like photo-resized.jpg. Resetting clears everything from browser memory.

Privacy notice: all image resizing is performed entirely in your browser. No images are uploaded, stored, or transmitted to any server. Uploaded images remain on your device during processing, and originals are never modified.