How to Compress JPG Without Losing Quality
Smaller JPG files at the same visual quality. Here's the simple rule, the right quality number, and the common mistakes to avoid.
The short answer
Save at JPEG quality 70-80. For most photos, that's the sweet spot where the file is dramatically smaller (often 60-80% less than the source) and no human looking at the image at normal viewing distance can tell.
Anything above 90 barely shrinks the file. Anything below 50 starts to show JPEG artifacts — blocky 8x8 grids and color banding in smooth regions like skies and skin.
Why JPEG compression works
JPEG splits the image into 8x8 pixel blocks and stores each one in the frequency domain. The high-frequency parts (sharp edges, fine texture) get quantised away first because the human eye is less sensitive to them.
That's the trick: throw away what nobody will miss. Done well, you save 70% of the file size. Done badly (quality < 30), the throw-aways pile up and the image looks crunchy.
Common mistakes
Re-saving a JPG repeatedly. Every save loses a little more — open, edit, save once. If you'll edit again, convert to PNG first.
Compressing twice. Re-compressing a JPG with the same tool at quality 70 doesn't make it 30% smaller again; the gains are tiny and the loss compounds.
Compressing before resizing. If you'll display the photo at 800px wide, resize to 800px first, then compress. Compressing a 4000px source and then resizing wastes effort.
Step-by-step with freeimgtool
The whole process on our free compressor:
- Open the Image Compressor.
- Drop a JPG or click to browse.
- Move the quality slider to 75.
- Click Compress.
- Check the Before / After / Saved row.
- Click Download.
Frequently asked questions
Is quality 100 lossless?
No — JPEG is always lossy. The file is slightly smaller than the source even at quality 100.
What if I need lossless?
Save as PNG or WebP-lossless instead. The file is bigger but bit-exact.
Will the EXIF data survive?
Re-encoding strips EXIF by default, which is a small privacy bonus (GPS coordinates and device identifiers are removed).