How to Increase Image Resolution in Illustrator

When you need to increase image resolution in Illustrator, first determine whether the artwork is a vector object or a placed raster image. Vectors are generally resolution-independent. Placed JPEG, PNG, and PSD files are limited by their pixel dimensions and their physical size on the page.

Changing an Illustrator setting to 300 ppi does not add the original detail missing from a small placed image. This guide separates the three resolution controls that are often confused, then walks through checking, correcting, and exporting print artwork.

The three resolution values to keep separate

For print photographs, 300 ppi is a useful starting point. If your print provider specifies another value, such as 350 ppi, follow that requirement.

How to check a placed image in Illustrator

1. Select the image

Use the Selection tool to click the placed artwork. Paths and live type are vectors. A linked JPEG, PNG, PSD, or similar file is raster content that needs a resolution check.

2. Open the Links panel

Choose Window > Links. Select the image and expand its link information to inspect the file name, image dimensions, color space, and placement scale.

The exact fields and scale behavior can vary with the Illustrator version and the way a file was placed. When the panel does not give you a clear effective-ppi value, calculate it from the source pixels and the physical placed dimensions.

3. Evaluate the effective resolution

The basic relationship is:

Effective ppi = source ppi ÷ placement scale

Treat 100% as 1, 200% as 2, and 50% as 0.5.

The larger you place a raster image, the lower its effective resolution becomes. Once the print size is known, use the print pixel-size chart to check whether the source has enough pixels.

How to fix a low-resolution placed image

Option 1: Replace it with a larger original

This is the most reliable solution. Find the camera original, working PSD, or the high-resolution version from the asset provider. Select the item in the Links panel and relink it.

After replacement, check the crop and aspect ratio. A file can show the same subject while having different canvas dimensions or margins that shift the placement.

Option 2: Reduce its placed size

Making the image smaller increases the pixels available per printed inch without inventing data. Reducing a 150 ppi placement to half its width and height raises the effective resolution to approximately 300 ppi, although the visible area becomes one quarter of its former size.

Option 3: Resample before placing

If no larger original exists and the layout cannot change, resample the image before placing it in Illustrator. Use an image editor for precise correction, or try 2× or 4× AI image enhancement when the goal is straightforward enlargement and edge improvement.

Save the processed version under a new name and relink it. Inspect small type, logos, product labels, and faces at 100%, because generated detail may alter their shapes.

Set the Document Raster Effects resolution

If drop shadows, blurs, glows, or similar effects look rough in print, choose Effect > Document Raster Effects Settings. For print work, set the resolution to the value required by the provider, often 300 ppi.

This setting controls pixels generated by Illustrator for effects. It does not increase the pixels in a linked low-resolution photograph. Treat it as a separate preflight step.

A higher value can increase render time and file size. If you use a lower setting while designing, return to the final output value and inspect every affected appearance before delivery.

Export a high-resolution PNG or JPEG

When the deliverable must be a raster image:

1. Choose File > Export > Export As.
2. Select PNG or JPEG and enable artboard export when appropriate.
3. Choose a resolution that matches the intended output.
4. For PNG, check transparency; for JPEG, check quality and color model.

Adobe's export options increase pixel dimensions and file size when you choose a higher resolution. This works well when rasterizing vector artwork and Illustrator effects, but it does not accurately reconstruct details missing from a placed source image.

For web output, start from required pixel dimensions. For print output, calculate from physical dimensions and the provider's ppi specification.

Exporting PDF for print

Use the PDF preset supplied by the print provider whenever possible. Selecting a small-file preset without checking its compression settings can downsample images unexpectedly.

Adobe's High Quality Print preset downsamples color and grayscale images to 300 ppi. It does not turn a 150 ppi placed image into a genuinely detailed 300 ppi source. Check effective resolution in Illustrator before exporting.

Does Image Trace make a low-resolution image sharp?

Image Trace converts pixel artwork into editable vectors. It can suit logos, simple line art, and illustrations with distinct shapes, but it is not a faithful way to preserve photographic gradients and texture.

Adobe's own guidance shows that tracing a tiny source cannot create the missing information. For photographs, use a larger source, reduce the placement, or use image-focused resampling instead.

Common problems

The photo still looks blurry after setting 300 ppi

You may have changed only the raster-effects or export setting. Inspect the placed image and calculate its effective ppi from source pixels and placement size.

The document contains missing links

Resolve every Links-panel warning before delivery. A missing source can prevent correct output. Package the job or deliver the approved print PDF according to the provider's workflow.

A clipping mask hides most of an enlarged image

The hidden area does not cancel the scale applied to the underlying image. Select the image itself and verify its placement and effective resolution.

JPEG files are repeatedly exported and placed again

Repeated rasterization and JPEG compression can damage edges and text. Keep the AI or PSD source during production, and convert to the delivery format once at the end.

Preflight checklist

• No missing placed-image links
• Effective ppi is sufficient at final placement size
• Low-resolution assets were replaced or resampled appropriately
• Document Raster Effects Settings match the output requirement
• PDF preset and color mode follow the printer's specification
• Small type, faces, logos, and thin lines were checked at 100%
• A full-size proof was reviewed when practical

Frequently asked questions

Can Illustrator alone increase photo resolution?

It can export more pixels, but it cannot accurately restore photographic detail absent from a placed source. Use a larger original, an image editor, or AI enhancement as appropriate.

Does embedding an image improve its quality?

No. Embedding stores the image data inside the Illustrator file and helps prevent missing links. It does not add pixels or detail.

Is setting raster effects to 300 ppi enough for print?

It is a useful effects setting, but placed images, color mode, bleed, fonts, and PDF options still need separate checks. The print provider's specification takes priority.

Summary

Increasing image resolution in Illustrator starts with the effective ppi of each placed raster asset. When it is too low, replace the source, reduce its placed size, or resample it before relinking.

Document Raster Effects Settings and export resolution serve different purposes. Checking all three areas prevents the common problem of a file that says “300 ppi” while its placed photographs remain visibly soft.

References

• Adobe Illustrator: Apply effects
• Adobe Illustrator: Export artwork
• Adobe Illustrator: Create Adobe PDF files
• Adobe Illustrator: Optimize Image Trace results