Resize an image in GIMP and export a separate copy
This is the procedure to leave the original image, reduce the pixel dimensions, and export it to JPEG/PNG. We will explain in detail the starting position, setting values, completion confirmation, and how to review in case of problems.
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Who this guide is for and what to prepare
- First-time users of GIMP
- People who want to safely check the operation of shrinking an image and saving it under a different name in GIMP
What you need
- Make a copy of the original image and decide on the maximum width required for your purpose and whether to use PNG or JPEG.
Open the original and inspect dimensions
Make a copy of the original image and decide on the maximum width required for your purpose and whether to use PNG or JPEG.
Scale the image while preserving proportions
Open the image with [File] > [Open], then select [Image] > [Scale Image]. Keep the width and height linked while entering the new width.
Choose an interpolation method and select [Scale]. Use [File] > [Export As] and save the result with a .png or .jpg extension.
- Specify pixel dimensions in Scale Image
- Apply scaling with proportions linked
Export PNG or JPEG with a separate name
Check the quality for JPEG and compression settings for PNG before exporting. Open in an image viewer to check pixel dimensions, aspect ratio, and legibility.
- Export a separately named PNG or JPEG
Open the result and inspect its quality
If you need transparency, choose PNG. JPEG cannot preserve transparent parts, and image quality deteriorates with repeated saving.
[Save] is an operation that creates an XCF for editing and does not become a distributed image. Do not overwrite the original image, and do not expect image quality recovery by enlarging after reduction.
- Inspect the finished image at 100% zoom
Separate pixel dimensions from print resolution
For a web delivery that needs a width of 1200 pixels, use Scale Image with pixel units and set the width. Keep the aspect-ratio link enabled so height follows the original proportions. Changing print-resolution metadata alone is not the same as resizing pixel dimensions. Enlarging an 800-pixel source does not recover missing detail; verify whether the destination truly requires a larger image.
For a product photo, retain the source and scale to the website required width. Inspect the JPEG at 100% for recognizable detail and labels. Check overlaid logo text too; export a standalone transparent logo as PNG rather than reusing the photo JPEG settings.
Inspect text and transparency after scaling
After scaling, inspect text, thin lines, and edges at 100% zoom. Logos and screenshots can lose legibility differently from photographs. Export PNG when transparency is required and check in another viewer that a checkerboard has not become actual image content. JPEG cannot retain transparency, so prepare the intended background when that format is needed.
Keep the editable project and delivery image
Save an XCF if future layer edits are needed, and export the delivery PNG or JPEG with a separate name. Names such as original.xcf and web-1200.png distinguish source and output. Reopen the export and inspect dimensions, orientation, color, and transparency. When correcting quality, export again from the original or XCF rather than repeatedly resaving an already compressed JPEG.
Scroll horizontally to see the full table →
| Observed result | Next action | Success condition |
|---|---|---|
| Proportions are distorted | Inspect the aspect link and dimensions | The original proportions are preserved |
| Transparency becomes white | Inspect format and background and use PNG | The intended transparent regions remain |
| Text is unreadable | Review size and scaling from the source | Required text is legible at 100% zoom |
Limitations and requirements
- [Save] is an operation that creates an XCF for editing and does not become a distributed image. Do not overwrite the original image, and do not expect image quality recovery by enlarging after reduction.
Frequently asked questions
What if you can't find the item you want in GIMP?
If you need transparency, choose PNG. JPEG cannot preserve transparent parts, and image quality deteriorates with repeated saving.
What should I be especially careful about when reducing an image in GIMP and saving it under a different name?
[Save] is an operation that creates an XCF for editing and does not become a distributed image. Do not overwrite the original image, and do not expect image quality recovery by enlarging after reduction.
Is scaling an image different from scaling a layer?
Use image scaling to change the entire delivery image size. Scaling one layer changes its relationship to the canvas and other layers. Confirm the chosen operation first and undo promptly if it was the wrong one.
How can I reduce JPEG size?
Compare pixel dimensions and export quality separately. Choose the required dimensions, then make separate quality variants and inspect detail and size. Re-export from the source when revising rather than repeatedly compressing an existing JPEG.
Sources and verification date
Sources checked: . These sources support the specifications, procedures or prices discussed here. Check each source for applicable conditions and current information.