Reduce Image Size to 150KB

How to use this tool

1. Upload a JPEG, PNG, or WebP image.
2. Set the maximum edge in pixels to remove unnecessary resolution.
3. Reduce to 150KB, check the new dimensions, and download the JPEG.

Preparing a medium photo attachment

Review the whole photo for changes in color and contrast. Browser re-encoding can discard camera metadata, so keep the original for archival use.

Resize first for a 150KB upload

Unlike quality-first compression, this tool first fits the image within your maximum edge while keeping proportions. This budget leaves more room for medium-sized photographs. Try keeping the original dimensions first; reduce resolution only if compression is insufficient.

Check the file and dimension limits separately

The tool treats 150KB as 150000 bytes, using the stricter decimal convention. A service that counts 1KB as 1,024 bytes allows 153600 bytes. Check the downloaded byte count against the receiving service’s rules.

When to use the dimension-first workflow

For example, a 4,000 × 3,000 camera photo rarely needs all its pixels for a small profile box. Limiting the long edge can reduce the amount of quality loss needed. If every original pixel matters, use the JPEG compressor instead.

Choosing dimensions before reducing to 150KB

When reducing an attachment, decide whether the recipient needs a quick view or a detailed inspection. A maximum edge suited to a small preview may be inappropriate for reading a photographed document. This image reducer does not recognize text or enhance it; inspect the exported pixels yourself.

For a medium photo attachment, start with the pixel dimensions needed at the destination. This workflow first limits the longest edge, then encodes a JPEG against your byte allowance. If the initial resize already removes important information, a higher quality setting cannot put those pixels back.

A practical 150KB file-size example

Suppose your source is 1,500KB and the permitted result is 150KB. The output must be no more than 10.0% of the source file size—a reduction of at least 90.0%. This calculation describes the requirement, not a predicted compression result. A quality setting of 10% would not reliably produce that percentage of the original bytes.

For a 2400 × 1800 source, setting the maximum edge to 1200 produces 1200 × 900 pixels before any further target-driven downscaling. That removes 75% of the pixel count. The final dimensions can become smaller if the first JPEG still exceeds the target.

Maximum edge and quality work together

Maximum edge is a ceiling, not a request to stretch the image. A portrait is usually limited by its height; a landscape is usually limited by its width. The other dimension follows proportionally. A source smaller than the chosen ceiling is not enlarged by this control.

Quality controls the JPEG encoding after resizing. Start with a moderate value and inspect the result. If the target requires further reduction, the tool can lower quality and dimensions. Use the dedicated resizer when exact width and height are mandatory, then check the file-size result separately.

Tools for this step: Resize to exact dimensions

If the 150KB image is rejected or looks unclear

Check the exact byte count before making another attempt. The result can be below 150KB without being exactly that size because the tool does not append padding. If it reports an unmet target, choose a smaller source crop or a larger allowance rather than assuming that the download already qualifies.

A soft result may have lost detail during the initial resize, before compression. Increase the maximum edge only if the receiving form allows it. If a specific subject is too small, crop closer to that subject instead of spreading more pixels over unused background.

• Confirm the destination really requests 150KB rather than 150MB.
• Open the exported image and check small text at normal reading size.
• Keep the original so you can make a fresh attempt without recompressing a damaged copy.