Decide whether “smaller” means fewer pixels or fewer bytes. For coursework, a submission form or a website, record the required width/height, aspect ratio, format and byte limit first. The examples below are explicit teaching conditions, not universal platform recommendations.

3 sizing modesFree; no accountRetain the original

Resize, crop or compress: choose from the requirement

Requirement Action Check
Width 320px Pixel mode Keep aspect locking on
Scale the whole photo by half 50% mode Both dimensions are halved
Cap portrait and landscape at a 320px long edge Longest-edge mode The longer dimension becomes 320
Square 200×200px Crop to 1:1, then resize Avoid stretching a rectangular image
Dimensions pass but size exceeds 1,000,000 bytes Review format/compression Dimensions do not guarantee encoded size

The byte limit is hypothetical; use the recipient’s actual requirement. The crop guide and format comparison explain the adjoining steps: composition → dimensions → format → size.

Compare the three sizing modes

Mode Original Setting Calculated result
Pixels, aspect locked 640×400 Width 320 320×200
Percentage 640×400 50% 320×200
Longest edge 640×400 320 320×200
Longest edge, portrait 400×640 320 200×320

With aspect locking, height is new width × original height ÷ original width, rounded to an integer. Here 320×400÷640=200. Dimensions that do not divide evenly can have a one-pixel rounding difference.

Once your requirements are clear

Check the required dimensions before saving

Enter the required width or longest edge, then check the calculated height and preview before saving.

Choose pixel or long-edge sizing
A 50 percent scale changes 640×400 into 320×200 and 256000 pixels into 64000; encoded file size must be checked separately
Distinguish dimension scaling from pixel-count scaling. Original diagram; select to enlarge.

Workflow: select, set, resize and download

  1. Open the Image Resizer, select a file and check its original dimensions and size.
  2. Choose pixels, percentage or longest edge. Keep aspect locking on for ordinary pixel-mode resizing.
  3. Enter the setting and press Resize. File selection alone does not generate output.
  4. Inspect both previews, especially lettering, legends and thin lines.
  5. Download and reopen the saved file, for example sample_resized_320x200.png.

Pixel and longest-edge fields accept integers from 1 to 10,000. Percentage mode accepts 1–500%. Large outputs still depend on source dimensions and device memory. The input-file limit is 50MiB, or 52,428,800 bytes.

Pixels, bytes and print resolution are different

640×400 has 256,000 pixels; 320×200 has 64,000. Encoded PNG/JPEG/WebP size need not fall by the same ratio. Compare the saved byte count.

For print planning, use width in mm ÷ 25.4 × ppi. A 25.4mm width at 300ppi needs 300 pixels. This tool has no control for writing 300dpi metadata; Canvas exports use 96dpi metadata where the format supports it. Check the placement dimensions in your print workflow separately.

Formats and quality checks

Check Current behavior
Output format PNG/JPEG/WebP generally retain their input type; GIF and other types fall back to PNG
Transparency Available in PNG/WebP; JPEG is composited onto white
Quality slider JPEG/WebP encoding setting, not a file-size percentage; unused for PNG
Animation Not preserved as an animation workflow
Research originals Keep them: resaving can change detail, color or metadata

PNG encoding is not a guarantee that an entire processing pipeline is unchanged. Inspect scientific labels and fine detail at the final placement size. Enlargement cannot reconstruct missing information.

Final submission check

  • Confirm the actual pixel dimensions or permitted bounds.
  • Confirm the destination accepts the saved format, not merely its extension.
  • Compare bytes, accounting for decimal MB (1,000,000) versus MiB (1,048,576).
  • Open the processed file and inspect its contents before selecting it for upload.

If only encoded size remains too large, continue to Image Compression. If the format is wrong, use the conversion guide. The implementation processes images in the browser without uploading them; page-loading requests, extensions and storage management are separate concerns.

Once your requirements are clear

Apply the checked settings to your original copy

Keep the original and compare the result. Favorite the tool near its name to reopen it for the next task.

Resize with your requirements

Update and verification scope

The Tools Hub editorial team compared the implementation, accepted ranges and calculated examples on October 26, 2026. Examples are instructional, not platform or institution specifications. The service is free and requires no account; no universal completion-time or byte-size benchmark is claimed. Favorites retain a tool shortcut in the same browser, not an image or a synced file.

Compare the available tools and guides in the image category.

FAQ

Does 50% make the file half as large?

50% scales both width and height. A 640×400 image becomes 320×200, one quarter of the pixels. Encoded file size depends on content, format and quality; check the downloaded byte size.

How do I make a 200×200 image without distortion?

If the source is not square, crop it to 1:1 first, then resize to width 200 with aspect locking enabled. Setting unrelated width and height values with the lock off changes the shape.

Can this tool produce a 300 dpi print file?

It changes pixel dimensions and has no control for writing 300 dpi metadata. Calculate the pixels required by the intended print size and check print settings separately. Canvas exports use 96 dpi resolution metadata in formats supporting it.

Will enlargement recover unreadable lettering?

Interpolation adds pixels but does not recover missing detail. Use an original-resolution image or the source document when available.