Bilder online skalieren
Ändern Sie die Abmessungen Ihrer Bilder auf jede Größe. Kostenlos, privat und sofort — alles läuft in Ihrem Browser.
100% Privat — Ihre Dateien verlassen niemals Ihr Gerät. Die gesamte Verarbeitung erfolgt in Ihrem Browser.
Bild hier ablegen
oder klicken zum Auswählen — JPG, PNG, WebP unterstützt
Originalgröße
Schnellvorlagen
Ergebnis
Wie funktioniert der Bildskalierungstool?
Dieses Tool nutzt die eingebaute Canvas-API Ihres Browsers, um Ihr Bild in den von Ihnen angegebenen neuen Abmessungen neu zu zeichnen. Der gesamte Prozess läuft lokal auf Ihrem Gerät — Ihre Bilder werden niemals an einen Server gesendet.
Tips for Better Image Resizing
- Lock the aspect ratio — Keep the aspect ratio locked (the default) to prevent your image from looking stretched or squished. This ensures width and height scale proportionally whenever you change either dimension.
- Use percentage presets for quick scaling — The 25%, 50%, and 75% presets are the fastest way to create thumbnails or reduce file size. A 50% reduction cuts the pixel count by 75%, dramatically shrinking the file while keeping proportions perfect.
- Pick dimension presets for specific targets — Use built-in presets like 1920×1080 (Full HD), 1280×720 (HD), or 800×600 for common web and social media sizes.
- Downscale rather than upscale — Shrinking an image preserves quality because the browser discards pixels. Enlarging forces the browser to interpolate new pixel data, which causes blurriness.
- Choose the right output format — After resizing, export as WebP for the smallest file size, JPEG for photographs, or PNG when you need transparency.
- Resize before compressing — If you plan to both resize and compress, resize first. Reducing dimensions first means the compressor has fewer pixels to process.
- Check the final dimensions display — Always verify the output dimensions shown below the width and height inputs before downloading.
When to Resize Your Images
- Social media profile pictures and banners — Each platform has specific dimension requirements (e.g., 1080×1080 for Instagram posts, 1500×500 for Twitter/X headers). Resizing ensures your images display perfectly without awkward cropping by the platform.
- Website and blog optimization — A 4000×3000 camera photo is far too large for a blog post. Resizing to 1200px wide before uploading cuts load time dramatically.
- Email-friendly images — Attaching full-resolution photos to emails wastes bandwidth and may exceed size limits. Resizing to 1280×960 or smaller makes images load instantly in email clients.
- Thumbnail generation — Use the 25% preset to quickly create thumbnail versions of product photos, gallery images, or portfolio pieces.
- Print preparation — When preparing images for print, resize to match your print size at 300 DPI — for example, a 4×6 inch print needs a 1200×1800 pixel image.
- E-commerce product listings — Marketplaces like Amazon, Etsy, and eBay have minimum and maximum image size requirements.
Häufig gestellte Fragen
Verringert das Skalieren die Bildqualität?
Das Vergrößern eines Bildes über seine Originalgröße hinaus kann zu leichter Unschärfe führen, da der Browser neue Pixel interpolieren muss. Das Verkleinern bewahrt die Qualität gut. Für beste Ergebnisse nur verkleinern oder nahe an der Originalgröße bleiben.
Was ist die Seitenverhältnis-Sperre?
Wenn das Seitenverhältnis gesperrt ist (Standard), passt die Änderung der Breite automatisch die Höhe an, um die gleichen Proportionen beizubehalten — und umgekehrt. Das verhindert, dass Ihr Bild verzerrt oder gestaucht aussieht. Sie können es entsperren, wenn Sie benutzerdefinierte Proportionen benötigen.
Was sind die Schnellvorlagen?
Vorlagen ermöglichen schnelles Skalieren auf gängige Abmessungen. Prozentuale Vorlagen (25%, 50%, 75%) skalieren relativ zur Originalgröße. Dimensionsvorlagen (1920×1080, 1280×720, etc.) setzen exakte Pixelwerte — nützlich für soziale Medien, Thumbnails oder Webveröffentlichung.
What are the best image sizes for social media?
Common social media sizes include 1080×1080 for Instagram posts, 1200×630 for Facebook shared images, 1500×500 for Twitter/X headers, and 1280×720 for YouTube thumbnails. Use the dimension presets in ImgLab to quickly hit these targets, or type custom dimensions with aspect ratio lock enabled.
Can I make a small image larger without losing quality?
Upscaling a raster image always involves some quality loss because the browser must generate new pixels that did not exist in the original. Small increases (up to 150%) are usually acceptable, but doubling or tripling an image's size will produce noticeable blurriness. For the best upscale results, start with the highest-resolution source image you have.
Can I resize multiple images at once?
The resize tool currently processes one image at a time, allowing you to fine-tune dimensions for each photo. For batch resizing, you can quickly process images one after another — just drop a new image after downloading the previous one. Each image retains your last-used dimensions and settings for faster workflow.
Does resizing change the DPI/PPI of my image?
ImgLab resizes by pixel dimensions, not by DPI. DPI (dots per inch) only matters for print — it defines how many pixels fit in a physical inch. A 3000×2000 image printed at 300 DPI produces a 10×6.67 inch print. The tool changes the pixel count; your print software controls DPI when you output to paper.