How To - Frequently Asked Questions

The Basics

How to Resize an Image

Resizing an image with SmallJPG.com is fast and simple:

  1. Upload your image – Drag & drop or use the upload button.
  2. Set dimensions – Choose width and/or height and tweak extra options.
  3. Process & download – Click "Download" to save your resized image.
Upload dragbox selector

Set Resize Dimensions

You can resize by width or height, and by default, the original aspect ratio is maintained. When you input one value, the other adjusts automatically.

Want to override the aspect ratio? Just disable the lock, and you’ll get full manual control over both dimensions individually.


Rotate Images

Rotate images in 90-degree steps using the directional buttons in the options panel. Each click turns the image a quarter rotation in the chosen direction.

 


Flip or Mirror

Flipping works like placing your image in front of a mirror: horizontally, vertically, or both. Flipping both axes is the same as rotating 180°.

Flip along horizontal axis Flip along vertical axis


Adjust Image Quality

Use the quality slider (12 steps) to balance file size and image clarity. The default is 'High' 66%, a smart middle ground. Higher quality increases file size, while lower values reduce it.

Setting output Quality slider

Set a Target File Size

For JPG and WebP, you can define a specific output size (in KB or MB). The final image will be just below your chosen limit, perfect for uploads with size caps.

Target Output Filesize

Fill Transparency

If your input image has transparent pixels (e.g., PNG, GIF or WebP) you can select a solid fill color to fill those pixels. Black (#000000) is the default, but any color is possible.

Filling transparent pixels is optional if the output file support transprarency, but required if output file does not (like JPG).

Transparency Fill Color

Advanced Features & Pro Tips

Crop Your Image

Cropping is optional but useful if you only want part of your image. After uploading, click the Crop button next to your file to select the area to keep.

Crop button after file selection

Confirm your crop, then press the Resize Image button.


Convert Image File Types

It is very easy to convert from one filetype to another. Upload any image and pick your preferred export format (JPG, PNG, GIF, WebP). SmallJPG converts the file automatically. By default, the output type matches the input.


Shrink or Enlarge

SmallJPG supports downscaling and upscaling. Our algorithm keeps your image looking sharp, even when enlarging. However, extreme enlargements may cause visible artifacts but I guess that is something you can suspect.


Are my Images safe?

Yes! Images are processed in your browser when possible. If server-side help is needed, files are stored only temporarily and deleted automatically within 1 hour.


Can I Share My Image URL?

No, images are not permanently stored. Since they're deleted within an hour, sharing links won't work. Use a dedicated image hosting service for sharing purposes.


Supported Image File Types & Best Uses

There is currently support for 4 filetype of images, both as source format and as an export format. These do not have to be equal so you can also convert filetype. Each of these types have certain benifits and types of useage so depending on the source and useage you need to pick the best. As a rule of thumb you best stick to the type of the source image.

  • JPG / JPEG - Best for Photographs

    JPG is a universal format ideal for compressing rich, detailed images like photos.

    Best for: Digital photos, website graphics, Social Media posts.

    Small file size with good quality
    Supported on all devices and browsers
    Great for complex, full-color visuals

    No transparency support
    Not optimal for sharp-edged graphics or text
    Loses quality if repeatedly edited & saved

  • PNG - Best for Transparent Graphics

    PNG is a lossless format that preserves sharpness and transparency.

    Best for: Logos, UI elements, icons, screenshots.

    Full support for transparency
    No compression artifacts
    Crisp edges and text

    Larger file size than JPG
    Less efficient for full-color photos
    Doesn't compress very well

  • GIF - Best for Simple Animations

    GIF is a legacy format limited to 256 colors, but supports basic animation and 1-bit transparency.

    Best for: Memes, simple loops, low-color images.

    Basic animation support
    Universal browser support
    Limited transparency

    Limited color palette
    Inefficient compression, so large file size
    Poor quality for detailed or large images

  • WebP - Best for Modern Web Performance

    WebP combines the strengths of JPG and PNG. Offers quality, compression, transparency, and animation support in one format.

    Best for: Speed-focused websites.

    Smaller files than JPG or PNG
    Supports transparency and animations
    Optimized for web use

    Limited support in old browsers
    Slightly slower to create
    Not natively supported by software