Free · No Upload · No Sign-up · No Watermarks

Resize Images Instantly — Free, Private & Online

The most secure, privacy-first image resizer. Resize JPG, PNG, WebP & GIF entirely in your browser using HTML5 Canvas. No images are sent to any server — your photos never leave your device.

100% Private Instant Processing No Watermarks JPG · PNG · WebP · GIF Always Free

Upload an image

Drag & drop your images here

or click to browse · paste with Ctrl+V · multiple files supported

JPG PNG WebP GIF

Popular Social Media Image Sizes

Click any size below to instantly apply it in the editor above.

Instagram

Post (Square) 1080 × 1080 px Portrait Post 1080 × 1350 px Story / Reel 1080 × 1920 px
Full Instagram size guide →

YouTube

Thumbnail 1280 × 720 px Channel Art 2560 × 1440 px Profile Picture 800 × 800 px
Full YouTube size guide →

Facebook

Cover Photo 820 × 312 px Post Image 1200 × 630 px Profile Picture 180 × 180 px
Full Facebook size guide →

Twitter / X

Post Image 1200 × 675 px Header Photo 1500 × 500 px Profile Picture 400 × 400 px
Full Twitter/X size guide →

LinkedIn

Post Image 1200 × 627 px Cover Photo 1584 × 396 px Profile Picture 400 × 400 px
Full LinkedIn size guide →

WhatsApp

Profile Photo 640 × 640 px Shared Image (max) 1600 × 900 px Status Image 1080 × 1920 px
Full WhatsApp size guide →

How to Resize an Image Online

  1. Upload your image

    Drag & drop, click to browse, or paste from clipboard with Ctrl+V.

  2. Set target dimensions

    Enter width & height in pixels, or use the percentage slider. Toggle aspect ratio lock to prevent distortion.

  3. Download your image

    Pick output format (JPG, PNG, WebP), set quality, then click Download — done!

Why Choose Resizo?

100% Private

All processing happens in your browser. Images are never uploaded to any server.

Instant & Fast

No waiting for uploads or server processing. Results appear in milliseconds using the Canvas API.

Bulk Resize

Resize multiple images at once and download them all as a ZIP file in one click.

Quality Control

Fine-tune output quality with a slider. Preview before/after with the built-in comparison tool.

Works on Mobile

Fully responsive, works on any smartphone or tablet — no app installation required.

Format Conversion

Input JPG, PNG, WebP, or GIF. Export as JPG, PNG, or WebP — with full format conversion.

More Free Image Tools

Compress PNG
Reduce PNG file size
JPG to WebP
Convert & compress
Instagram
Posts & stories
YouTube
Thumbnails & banners
Facebook
Posts & covers
Twitter / X
Headers & profiles
LinkedIn
Banners & logos
WhatsApp
Profile & status

Standard Image Sizes for Every Platform

Use Resizo to resize your images to the exact pixel dimensions required by each platform.

Instagram
  • Post (Square)1080 × 1080 px
  • Portrait Post1080 × 1350 px
  • Story / Reel1080 × 1920 px
Full Instagram size guide →
YouTube
  • Thumbnail1280 × 720 px
  • Channel Art2560 × 1440 px
  • Profile Picture800 × 800 px
Full YouTube size guide →
Facebook
  • Cover Photo820 × 312 px
  • Post Image1200 × 630 px
  • Profile Picture180 × 180 px
Full Facebook size guide →
Twitter / X
  • Post Image1200 × 675 px
  • Header Photo1500 × 500 px
  • Profile Picture400 × 400 px
Full Twitter/X size guide →
LinkedIn
  • Post Image1200 × 627 px
  • Cover Photo1584 × 396 px
  • Profile Picture400 × 400 px
Full LinkedIn size guide →
WhatsApp
  • Profile Photo640 × 640 px
  • Shared Image (max)1600 × 900 px
  • Status Image1080 × 1920 px
Full WhatsApp size guide →

Aus dem Blog

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Datenschutz

Warum Sie private Fotos niemals zu Online-Resizern hochladen sollten

Die meisten Bildtools verlangen Vertrauen in einen unsichtbaren Server. Genau das ist das Problem.

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Workflow

Der schnellste Weg, Bilder für das Web in Bulk zu skalieren

Hochladen, warten und wieder herunterladen kostet die meiste Zeit. Resizo entfernt diesen Umweg.

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Anleitung

Bild online kostenlos skalieren – Kein Software-Download nötig

Bilder zu skalieren erfordert keine schwere Software mehr. Mit Resizo erledigen Sie es kostenlos im Browser.

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Tipps

Bild ohne Qualitätsverlust skalieren

Skalieren muss keine Qualitätsverluste bedeuten. Mit dem richtigen Format bleiben Bilder gestochen scharf.

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Frequently Asked Questions

Is Resizo free to use?
Yes, Resizo is completely free. There are no sign-ups, subscriptions, or watermarks — ever.
Is my image uploaded to a server?
No. All image processing happens entirely in your browser using the HTML5 Canvas API. Your images never leave your device.
Does resizing an image reduce its quality?
Resizo uses high-quality bicubic interpolation via the Canvas API to minimise quality loss. You can also control the output quality with the quality slider for JPG and WebP formats.
What image formats does Resizo support?
Resizo supports JPG, PNG, WebP, and GIF as input formats. You can export your resized image as JPG, PNG, or WebP.
Can I resize images on mobile?
Yes. Resizo is fully responsive and works on any modern smartphone or tablet browser — iOS Safari, Android Chrome, and others. No app installation required.
Can I resize multiple images at once?
Yes! You can upload multiple images at once. Apply the same dimensions to all images with "Apply to All", then download everything as a single ZIP file.