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Bild-Größenänderer — Kostenloses Online-Tool

Bilder in Pixel oder Prozent skalieren

Bilder auf beliebige Abmessungen ändern. JPG, PNG, WebP unterstützt. Qualität bleibt erhalten. Browserbasiert, ohne Anmeldung.

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Free image resizer — by pixels or percent, aspect-ratio safe

Toololis Image Resizer changes image dimensions in your browser using the Canvas API. Input exact pixel dimensions or a percentage scale. Aspect-ratio lock keeps proportions correct automatically. Nein upload to any server.

How to use this tool

  1. 1

    Upload your image

    Drop or pick a JPG, PNG, or WebP. The original dimensions will appear automatically.

  2. 2

    Enter target dimensions

    Type width, height, or a percentage. Aspect-ratio lock keeps proportions — toggle off to stretch.

  3. 3

    Download the resized image

    Canvas re-renders at the new size and gives you a download link. Quality is preserved for JPG/WebP output.

Common image sizes in 2026

  • Hero banner — 1920×1080
  • Blog featured / OG image — 1200×630
  • Instagram post (square) — 1080×1080
  • Instagram story — 1080×1920
  • LinkedIn banner — 1584×396
  • YouTube thumbnail — 1280×720
  • Favicon — 512×512 (for modern browsers)
  • Profile avatar — 400×400

Frequently Asked Questions

Does resizing reduce quality?
Downscaling (making smaller) barely reduces perceived quality — just fewer pixels. Upscaling (making larger) introduces blur because no new detail exists. For upscaling, use an AI upscaler tool instead.
What resampling algorithm is used?
The browser's built-in canvas rendering uses bilinear/bicubic interpolation automatically. It's the same algorithm Photoshop's "Bilinear" mode uses — good for most cases, preserves edges reasonably.
How is aspect ratio calculated?
From the source image's width-to-height ratio. When locked, changing width automatically updates height (and vice versa). Unlocking lets you stretch the image non-proportionally.
Is my image uploaded anywhere?
Nein. Everything runs in your browser. Safe for private photos, ID scans, or confidential documents.
What are common image sizes?
Web hero: 1920×1080. Blog featured: 1200×630 (also Open Graph). Instagram post: 1080×1080. LinkedIn banner: 1584×396. YouTube thumbnail: 1280×720. Favicon: 512×512.
Can I resize multiple images at once?
Neint currently — this tool processes one at a time for clarity. For batch operations, use the Image Compressor which supports multiple files.

Wichtigste Punkte

  • Image Resizer is a free, browser-based image tool — resize images by pixels or percentage.
  • Nein signup, no downloads, no file uploads. Tools run in your browser; the few that need an outside service say so on the page.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use Image Resizer

  1. Open the tool: Launch Image Resizer on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

Image Resizer — Quick Facts

Preis
Kostenlos — keine Limits, kein Wasserzeichen, keine Paywall
Privatsphäre
Wird im Browser verarbeitet. Tools, die einen externen Dienst brauchen, sagen das auf der Seite. Seitenaufrufe werden gezählt (Google Analytics).
Plattform
Jeder moderne Browser — Desktop, Tablet, Mobil
Kategorie
Image Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
MerkmalDetails
ToolImage Resizer
KategorieImage
Anmeldung nötigNein
Datei-UploadKeine — wird im Browser verarbeitet
Mobile-UnterstützungVoll responsive
KostenFür immer kostenlos

Why Use Image Resizer?

You should try Image Resizer for a quick, private way to resize images by pixels or percentage. Processing happens in your browser and files are never uploaded; the few tools that need an outside service say so on the page.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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Convert between JPG, PNG, WebP, AVIF

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100% Privatsphäre. Dieses Tool läuft komplett in deinem Browser. Deine Daten werden niemals auf einen Server hochgeladen.