Question 1

What is the difference between resizing and cropping an image?

Accepted Answer

Resizing changes the dimensions of the entire image — it becomes larger or smaller, but the content is preserved in full (possibly distorted if the aspect ratio changes). Cropping selects a specific region and eliminates the rest — the resulting dimensions are exactly those of the selected area.

Question 2

What happens when I disable the aspect ratio lock and only change the width?

Accepted Answer

The image is stretched horizontally without compensating the height. This causes distortion — objects and people appear 'squashed' or 'widened'. Use this option only when the destination has mandatory fixed dimensions and distortion is acceptable, such as certain document formats or print layouts.

Question 3

What are the correct dimensions for an Instagram feed post?

Accepted Answer

Instagram accepts images between 320–1080 px wide. For square, 1080×1080 px. For portrait (4:5), 1080×1350 px. For landscape, 1080×566 px. Larger images are automatically resized. Final quality depends more on Instagram's compression than on the exact dimensions — sending at the correct size avoids double resizing.

Question 4

What resolution should I use for documents like ID photos or passport pictures?

Accepted Answer

For quality printing, resolution matters. A 3×4 cm photo at 300 DPI needs 354×472 px. ICAO passport photos (35×45 mm) require 413×531 px at 300 DPI. The presets in this tool use standard pixel dimensions for printing. Always verify the requirements of the specific authority or service before printing official documents.

Question 5

Why should a YouTube thumbnail be 1280×720 px?

Accepted Answer

YouTube displays thumbnails at various sizes depending on device and context. 1280×720 (16:9 ratio) is the maximum accepted size and ensures sharpness in all display contexts. Smaller thumbnails are upscaled and appear blurry. The file size limit is 2 MB — JPEG at 85–90% quality usually stays well below that limit.

Question 6

Does the processed image lose quality each time it is resized?

Accepted Answer

For raster images (JPG, PNG, WebP), yes — each lossy re-encoding adds artifacts. Resizing an already-compressed image and saving as JPEG applies a second compression. To preserve maximum quality, always work with the original image at full resolution and apply resizing only at the final step.

Question 7

What is interpolation and how does it affect quality when enlarging an image?

Accepted Answer

When you enlarge an image, the computer must invent pixels that did not exist — this process is interpolation. Bilinear and bicubic interpolation (used by the Canvas API) produce smooth results but can look blurry. Scaling a small image up to large dimensions (upscaling) never recovers original details — it only smooths out the pixelation.

Question 8

Can I use this tool to prepare images for printing?

Accepted Answer

For resizing in pixels based on document presets, yes. But note: professional-quality printing requires DPI control, color profiles (CMYK vs sRGB) and specific formats (TIFF, PDF). This tool works in pixels and exports to JPEG, PNG or WebP — suitable for home printing and most online services, but not a replacement for specialized editing software for professional print.

Image Resizer & Cropper

Resize vs crop: what is the difference and when to use each

Choose the mode and apply the transformation in three steps

Sources and references for this tool

Frequently asked questions

Resize vs crop: what is the difference and when to use each

Choose the mode and apply the transformation in three steps

Sources and references for this tool

Frequently asked questions

Related tools