Pixels or percentage?

Pixels when you have a target spec (e.g. 'must be exactly 1200×630 for OG image'). Percentage when you're just shrinking ('half the size of the original'). Lock the aspect ratio in either mode to avoid stretched output.

Does upsizing improve quality?

No. Upsizing (e.g. 500px → 2000px) doesn't add detail; Canvas interpolates between existing pixels. The result looks blurry compared to a true 2000px source. Use this tool to shrink confidently; for upsizing, find a higher-resolution source or use an AI upscaler.

What format is the output?

Same format as the input (PNG stays PNG, JPG stays JPG). To change the format too, run the output through the image-converter tool.

Bildgrösse ändern

Bilder im Browser in Pixel oder Prozent skalieren - kein Upload.

Läuft in deinem Browser

Bild ablegen, neue Abmessungen wählen (Pixel oder Prozent), Seitenverhältnis bei Bedarf locken, dann herunterladen. Das Original bleibt unverändert und wird nicht hochgeladen - die Kopie wird lokal per Canvas erzeugt.

Bild hier ablegen oder klicken zum Auswählen

PNG, JPG, WebP, AVIF, GIF, BMP

So funktioniert's

Drop an image
Drag a PNG / JPG / WebP / AVIF / GIF onto the dropzone or click to pick one.
Set the new dimensions
Type pixels (lock aspect ratio for proportional scaling) or use the percentage shortcut (50%, 25%).
Download
The resized copy downloads with `-resized` appended to the filename. The original is untouched.

Was ist das?

An image resizer changes the pixel dimensions of an image - shrinking it to save bandwidth, or fitting it to a target spec. The browser's Canvas API handles the actual resampling using bilinear or bicubic interpolation depending on the engine. Quality is preserved when you shrink; upsizing can't add detail that wasn't in the source.

Wann verwenden

Resizing photos before uploading to a service with a max file size, fitting an image to a specific design slot (1200×630 for OG, 1080×1080 for Instagram), or batch-shrinking a screenshot for a documentation page. Anywhere you need to change pixel dimensions without round-tripping through Photoshop.

Häufige Fehler

Forgetting to lock the aspect ratio and ending up with a stretched / squashed image. Saving the same image at the same dimensions repeatedly (each save through a lossy format like JPG loses a little quality - the so-called 'generational loss'). And upsizing in the hope of recovering detail - it doesn't work; pick a higher-res source instead.

FAQ

Pixels or percentage?: Pixels when you have a target spec (e.g. 'must be exactly 1200×630 for OG image'). Percentage when you're just shrinking ('half the size of the original'). Lock the aspect ratio in either mode to avoid stretched output.
Does upsizing improve quality?: No. Upsizing (e.g. 500px → 2000px) doesn't add detail; Canvas interpolates between existing pixels. The result looks blurry compared to a true 2000px source. Use this tool to shrink confidently; for upsizing, find a higher-resolution source or use an AI upscaler.
What format is the output?: Same format as the input (PNG stays PNG, JPG stays JPG). To change the format too, run the output through the image-converter tool.

Bildkonverter

PNG, JPG, WebP und AVIF im Browser konvertieren - kein Upload, keine Anmeldung.

Bildkompressor

JPG- und WebP-Dateigrösse mit Qualitäts-Slider und Vorher/Nachher-Vorschau verkleinern.

Bild-Zuschneider

Bilder durch Ziehen einer Auswahl zuschneiden - frei oder mit festen Seitenverhältnissen (1:1, 4:3, 16:9, 9:16).