Fix JPEG artifacts online for free
Upload a JPEG and quickly clean up compression blocks, edge halos, and quality loss, with no account or software needed.
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What are JPEG artifacts?
JPEG artifacts are visual defects introduced when a lossy encoder compresses an image. The format divides the image into 8×8 pixel blocks and discards frequency information it deems imperceptible, a trade-off that works well at high quality settings but becomes obvious at lower ones. The tell-tale signs are blocky patches across flat areas, fringing and haloing around sharp edges, and a general loss of fine texture and gradient smoothness. Re-saving a JPEG compounds the damage: each encode strips out another round of detail on top of what was already lost.
Why do photos also develop stripes and banding?
Alongside block artifacts, JPEG compression can cause banding, visible stripes across what should be a smooth tonal gradient. An 8-bit image has only 256 values per channel, and the encoder's quantization step can push similar tones into the same bucket, making subtle gradations look stepped. Skies, out-of-focus backgrounds, and any evenly-lit surface are most vulnerable. The original RAW or 16-bit TIFF file usually looks fine, but once exported to JPEG these areas can show both blocking and banding simultaneously.
How to fix JPEG artifacts
- Avoid lossy round-trips. Store and edit from your original RAW or 16-bit TIFF. Export to JPEG exactly once, at the end of your workflow. Every re-encode permanently removes more information, and there's no way to recover what the encoder discards.
- Reduce blocking and banding in Photoshop. A Reduce Noise filter (or a Surface Blur on isolated areas) smooths out quantization steps. Adding a small luminance noise layer (0.5–2%) breaks up both blockiness and banding by introducing natural-looking variation. Apply adjustments on masked layers to limit their reach.
- Fix JPEG artifacts online with our free tool above. Upload your image, set the correction level, and download a cleaned version. The tool targets both compression blocks and gradient banding in JPEG, PNG, TIFF, and other formats, with no software or sign-up required.
Want to learn more?
We wrote a whole article on the topic in our blog with a more detailed view on the problem and solutions: De-banding and fixing compression artifacts