Approximate target
Image encoders cannot guarantee an exact byte count. The tool favors the largest measured result at or below your target.
Image Tools · Local processing
Compress Image to Target Size
Aim for an approximate KB or MB limit using measured encoding attempts and optional dimension reduction.
Measured local compression
Target an approximate maximum image size
The practical guide
Target a practical file-size ceiling without pretending bytes are predictable.
The tool searches image quality levels, measures every result, and can reduce dimensions if quality changes alone cannot reach the requested size.
Dimensions may matter
Very small targets may be impossible at the original resolution. Dimension reduction is separately disclosed and can be disabled.
Choose the right output
JPG works well for photos. WebP supports transparency and often compresses mixed graphics efficiently.
Privacy by architecture
Your files and tool inputs stay in your browser.
The selected files, inputs, settings, and outputs are processed in this page and are not uploaded to any server.
Questions, answered
Frequently asked questions
Is my image uploaded?
No. Decoding, iterative encoding, resizing, measurement, and downloading happen locally.
Will the result be exactly 100 KB?
Not necessarily. The result aims to be at or below the target, but browser encoders produce discrete, content-dependent sizes.
Why were dimensions reduced?
Quality reduction alone could not reach the selected target, and the dimension-reduction option was enabled.
Can PNG files be used?
Yes. PNG input can be converted to WebP or JPG for target-size compression; WebP is preferable when transparency matters.