What are JPEG artifacts?

The visible damage heavy JPEG compression leaves: blocky squares, smeared detail, banding in smooth areas and halos around sharp edges. They get worse each time the same image is saved again as a JPEG.

Is compression the same as low resolution?

No. Resolution is how many pixels an image has at its print size; compression is how much detail was thrown away to store them. A 300 ppi image can still be badly compressed, and a low-resolution image can be perfectly clean.

Can JPEG artifacts be removed?

Reduced, not removed. Artifact-removal and AI upscaling tools can smooth mild blockiness in photos, but the detail that was thrown away is gone. A better original is the real fix.

Do printers accept JPEG images in a PDF?

Yes. A JPEG saved at a high quality setting prints well, and print PDF presets compress photos with high-quality JPEG themselves. The trouble is low quality settings and repeated re-saving, not the format.

How much does it cost to fix?

Exporting again or replacing a few images is a $25 fix. If the design file is gone and the layout has to be rebuilt, we quote a fixed price in the chat first.

The printer said

“The images are heavily compressed”: Fixing JPEG compression artifacts in print files

Short answer

JPEG compression makes files smaller by throwing image detail away. At low quality settings it leaves visible blocks, smudged texture, banding in smooth areas and fuzzy halos around text and edges, and printing makes them more obvious, not less. It’s not the same as low resolution: an image can be 300 ppi and still be badly compressed. The fix is to go back to the original image or design file and export again at maximum quality, because the lost detail can’t be put back.

Updated November 8, 2026 · by Azaan Ali, print designer

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Why printers ask for this

JPEG compression works on small squares of pixels, 8 × 8 at a time, and simplifies each one. At a high quality setting the change is invisible. At a low one, or after the same JPEG has been saved over and over, the squares start to show, fine texture turns to mush, and sharp edges such as type over a photo or a logo on a flat color pick up a ringing halo. On a phone screen it’s easy to miss. Printed at 300 ppi on a poster or a menu, it isn’t.

It usually happens without anyone choosing it. The Smallest File Size PDF preset in InDesign and Illustrator uses aggressive compression and downsampling; Acrobat’s Reduced Size PDF and online “compress PDF” tools re-compress every image; Office programs compress pictures by default when they save; and photos sent through WhatsApp, email or social media arrive as smaller, recompressed copies. Each step throws away a little more detail, permanently.

How to fix JPEG compression artifacts in a print file

Look closely. Open the PDF in Acrobat and zoom to 200–400% on photos, skies, skin, gradients and any text over images. Blocky squares, blotchy color and halos around edges are compression; an image that’s soft but smooth is more likely low resolution.
Compare it with the original image. If the original is clean, the export did the damage, so fix the settings below. If the original is already blocky, find a better copy: the camera file, the photographer’s full-size download or the stock site’s high-resolution file, not a copy saved from a website, WhatsApp or an email.
InDesign: File → Export → Adobe PDF (Print), and choose [High Quality Print], [Press Quality] or the PDF/X preset your printer asks for, never [Smallest File Size]. In the Compression panel, set Image Quality to Maximum for color and grayscale images. Illustrator’s Save As → Adobe PDF dialog has the same presets and Compression panel.
Photoshop: if you save a JPEG to place in the layout, use File → Save As → JPEG at Quality 10–12, or save a TIFF or PSD instead. Edit from the original each time, not from a JPEG you’ve already saved.
Word, PowerPoint and Excel: go to File → Options → Advanced and, under Image Size and Quality, tick Do not compress images in file. Pictures that were already compressed when the file was saved stay that way, so insert the originals again.
Canva: upload the original photos rather than screenshots or saved copies, and download as PDF Print, not PDF Standard, which is meant for smaller files.
Send the print PDF at full size, however big it is: use your printer’s upload or a file-transfer service. Never run a print file through Reduced Size PDF or an online compressor to make it fit an email.
If there’s no better original, an AI upscaler or artifact-removal tool can smooth mild damage in photos, but it can’t restore the detail. Logos and text should be redrawn as vectors instead. The free print-ready checker reports each image’s resolution at its printed size, which catches a file that was downsampled, but it doesn’t measure compression, so the zoom check is still the one to do.

Or send it to us

Find every image that shows compression damage at its printed size
Export again from your design file with print-quality settings, or rebuild the PDF if the design file is gone
Replace damaged photos with the originals, or a licensed stock match with your OK first
Redraw logos and text that only exist as compressed pictures

Fix my file · $25 Same day, fixed price, one round of changes included. Or ask a designer first.

Questions

What are JPEG artifacts?: The visible damage heavy JPEG compression leaves: blocky squares, smeared detail, banding in smooth areas and halos around sharp edges. They get worse each time the same image is saved again as a JPEG.
Is compression the same as low resolution?: No. Resolution is how many pixels an image has at its print size; compression is how much detail was thrown away to store them. A 300 ppi image can still be badly compressed, and a low-resolution image can be perfectly clean.
Can JPEG artifacts be removed?: Reduced, not removed. Artifact-removal and AI upscaling tools can smooth mild blockiness in photos, but the detail that was thrown away is gone. A better original is the real fix.
Do printers accept JPEG images in a PDF?: Yes. A JPEG saved at a high quality setting prints well, and print PDF presets compress photos with high-quality JPEG themselves. The trouble is low quality settings and repeated re-saving, not the format.
How much does it cost to fix?: Exporting again or replacing a few images is a $25 fix. If the design file is gone and the layout has to be rebuilt, we quote a fixed price in the chat first.

Terms on this page: JPEG compression, Banding (gradient banding), DPI / PPI (resolution), Raster (bitmap), Vector.

Standard sizes, with bleed: poster sizes, and every print size.

Sources: Adobe InDesign: PDF export options, Adobe Illustrator: Adobe PDF presets, Adobe Acrobat: PDF Optimizer image settings, Adobe Photoshop: save images in JPEG format, Microsoft: turn off picture compression in Office.

Other things printers say

The printer said“The images are low resolution.”Print needs about 300 pixels for every inch of printed size (150 for big posters, less for billboards seen from far away).See the fix The printer said“Your logo is blurry.”A logo saved as a JPEG or PNG is made of pixels, so it goes soft or blocky when it’s printed bigger than it was made.See the fix The printer said“Please send a print-ready PDF.”Printers ask for a PDF because it fixes everything in place: the size, fonts, images and colors come out the same on their system as on yours.See the fix

More on this kind of work: Print file fixing. Something else wrong with the file? See every printer message we fix.

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