Resize your images to exact dimensions — for social media, print, passport photos, or web use.
PDF Europe's Image Resizer supports pixels, inches, centimeters, and millimeters.
Maintains quality, completely free, no signup required.
What is Image Resizing?
Image resizing means changing the dimensions (width and height) of an image. There are two types:
- Downscaling (making smaller): Reducing an image below its original size. File size decreases, quality is generally maintained;
- Upscaling (making larger): Enlarging an image beyond its original size. Blurriness can occur because pixels are "stretched."
Resizing and cropping are different. Resizing scales the entire image; cropping cuts out part of the image.
Why Different Units Matter
Different use cases require different units:
- Pixels (px): For screen use — websites, social media, apps. Every device has a different pixel density;
- Inches: For print use — standard in the US and UK. 1 inch = 96 pixels on screen;
- Centimeters (cm) / Millimeters (mm): International print standards — passport photos, ID cards, EU documents.
PDF Europe's tool automatically converts units. You enter "35 mm," and the tool converts it to the correct
pixels based on DPI.
Common Use Cases
- Social media: Instagram post (1080×1080), Facebook cover (820×312), YouTube thumbnail (1280×720), LinkedIn banner (1584×396);
- Passport / Visa photos: US (2×2 inch), UK (35×45 mm), India (35×35 mm), Schengen (35×45 mm);
- Web images: Blog post headers, product photos, thumbnails;
- Print documents: ID cards, badges, certificates.
How Resizing Affects Image Quality
The impact on quality depends on the direction:
- Downscaling (smaller): Quality is generally good — pixels merge, and the algorithm reduces intelligently. File size decreases;
- Upscaling (larger): Pixels must be "invented," which creates blur or pixelation. Professional upscaling tools use AI, but free tools use simple interpolation;
- Preserving aspect ratio: If you change width and height independently, the image can look stretched or squished. Use the "Maintain aspect ratio" option.
How to Resize an Image: Step by Step
- Upload image: Select a JPG, PNG, WebP, or GIF;
- Choose unit: Select pixels, inches, cm, or mm;
- Enter dimensions: Enter width and height. Keep "Maintain aspect ratio" checked to avoid stretching;
- Click Resize: Processing takes seconds;
- Download: Download the resized image. Original files are deleted within 2 hours.
Frequently Asked Questions
What image formats are supported?
JPG, JPEG, PNG, WebP, and GIF. The resized image is saved in the original format.
Will resizing reduce image quality?
Downscaling generally maintains quality. Upscaling can introduce blurriness. For best results, start with a high-resolution original and downscale.
Can I resize images to passport photo dimensions?
Yes, but for passport photos, the Passport Photo Maker tool is better — it automatically removes the background, detects the face, and crops to comply.
What is the difference between pixels and inches?
Pixels are digital dimensions (for screens). Inches are physical dimensions (for print). 1 inch = 96 pixels on screen, but 300 pixels (300 DPI) for print.
Can I resize multiple images at once?
For bulk resizing, see the Bulk Tools section — or contact us and we can build a bulk resize tool for you.
Resize your images now
Exact dimensions in pixels, inches, cm, or mm — without quality loss.