Shrink file size without visibly wrecking the image. Compare before and after, then download.
- 1
Drop in an image. Large photographs benefit most.
- 2
Move the quality slider and watch the file size and the preview together.
- 3
Switch format if it helps. WEBP is usually 25 to 35 percent smaller than JPG at the same quality.
- 4
Download when the saving is worth the loss.
- Input
- PNG, JPG, WEBP, GIF, BMP
- Output
- JPG or WEBP
- Quality range
- 10 to 100 percent
- Account
- Not required
What is image compressor?
An image compressor reduces a file's size by re-encoding it at a lower quality setting or in a more efficient format, trading detail you cannot see for bytes you can measure. APImage's compressor runs in the browser, shows the original and the compressed version side by side with both file sizes, and lets you move the quality slider until the saving stops being worth it.
Is compression lossless?
Not here. JPG and WEBP at anything below 100 percent are lossy, meaning detail is discarded permanently. That is the point: at around 80 percent quality most photographs lose half their file size with no visible difference. Keep your original if you may need to re-edit.
What quality setting should I use?
Start at 80 percent. Photographs usually survive 70. Anything with text, sharp edges or flat colour shows artefacts much earlier, so either keep the quality high or export as PNG instead.
Why is my PNG bigger than my JPG?
Because PNG is lossless and stores every pixel exactly, which is what makes it right for text, logos and transparency and wrong for photographs. Convert photographs to JPG or WEBP and leave graphics as PNG.
Does this affect image dimensions?
No. Compression changes the file size, not the pixel dimensions. To reduce dimensions as well, resize first and then compress, which usually saves far more than compression alone.
