What Is Image DPI Converter?

Image DPI Converter lets you check and change the DPI (Dots Per Inch) or PPI (Pixels Per Inch) resolution of your images. Whether you're preparing photos for print, adjusting resolution for web use, or meeting specific DPI requirements, this tool handles it all directly in your browser.

Understanding DPI

DPI determines how many dots (or pixels) fit into one inch when an image is printed. A higher DPI means more detail and a sharper print, while a lower DPI is suitable for screens and web.

72 DPI

Standard for web and screen display

150 DPI

Suitable for draft prints and proofs

300 DPI

Industry standard for high-quality printing

600 DPI

Used for fine art and professional output

Two Conversion Modes

The tool offers two distinct ways to change DPI, each serving different purposes:

Metadata Only

Change DPI Only

Modifies the DPI tag embedded in the file without touching the actual pixels. The image looks the same on screen, but its physical print size changes.

Pixels remain unchanged
File size stays similar
Best for meeting DPI requirements

Pixel Adjustment

Resample Image

Recalculates the pixel dimensions to achieve the target DPI while maintaining the same physical print size. This actually adds or removes pixels.

Pixels are added or removed
File size changes
Best for resizing images

How to Use Image DPI Converter

Upload Your Image

Drag and drop an image onto the upload area, or click to browse your files. Supported formats include JPEG, PNG, WebP, and BMP (up to 50 MB).

Review Image Information

After uploading, the tool displays comprehensive details about your image:

Image preview — A thumbnail of your uploaded image
Dimensions — Width and height in pixels
Format — The image file type
Current DPI — Detected from the file metadata (defaults to 72 if not found)
Print Size — The physical size when printed at the current DPI, shown in both centimeters and inches

Choose Your Mode

Select one of the two conversion modes based on your needs:

Change DPI Only — Keeps pixels unchanged, only updates the DPI metadata. Use this when a printer or service requires a specific DPI value.
Resample Image — Resizes the image pixels proportionally. Use this when you need a different pixel count for a specific physical print size.

Set Target DPI

Enter a custom DPI value or click one of the quick presets: 72 (Web) 150 (Draft) 300 (Print) 600 (HQ). The output dimensions and print size update in real time.

Download

Click the Download button. JPEG images are saved as JPEG; all other formats are converted to PNG. The DPI metadata is embedded directly in the downloaded file.

Key Features

Automatic DPI Detection

The tool reads DPI metadata from multiple sources: JFIF headers and EXIF data in JPEG files, and pHYs chunks in PNG files. If no DPI information is found, it defaults to the standard screen resolution of 72 DPI.

Real-Time Output Preview

As you adjust the target DPI or switch modes, the output dimensions and print size update instantly. This lets you see exactly what you'll get before downloading — no guesswork needed.

Accurate DPI Metadata Injection

The downloaded file includes properly embedded DPI metadata. For JPEG files, the JFIF density fields are updated. For PNG files, a pHYs chunk with the correct pixels-per-meter value is inserted.

Compatible with print software
Works with design tools
Supported by publishing platforms

Print Size Calculator

See the physical print dimensions in both centimeters and inches for any DPI setting. Quickly determine if your image has enough resolution for a specific print size, such as an A4 page or a poster.

Your Data Stays Private: All processing happens in your browser. Images never leave your device, we don't collect usage data, and everything runs locally using Canvas API — no server processing required.

Frequently Asked Questions

What is the difference between DPI and PPI?

DPI (Dots Per Inch) and PPI (Pixels Per Inch) are often used interchangeably. Technically, DPI refers to the physical dots a printer produces, while PPI refers to pixels on a screen. For digital images, the DPI/PPI value stored in metadata determines the default print size.

Does changing DPI improve image quality?

Changing DPI metadata alone does not add or remove pixels — it only affects print size. To increase quality for a larger print, use the Resample mode, which adds pixels (though upscaling may introduce softness). For best results, start with the highest resolution source image available.

Pro Tip: Higher DPI doesn't magically create detail that wasn't in the original image. Always capture or scan at the highest resolution possible from the start.

What DPI should I use for printing?

The appropriate DPI depends on your print type and viewing distance:

300 DPI — Standard for most print jobs, including brochures, magazines, and photo prints
150 DPI — Sufficient for large-format prints viewed from a distance (posters, banners)
600 DPI — Appropriate for fine art or professional output requiring exceptional detail

What DPI should I use for web?

Screens display images in pixels, so DPI has no visible effect on web images. The convention is 72 DPI, but what matters for the web is the actual pixel dimensions, not the DPI tag.

Remember: For web optimization, focus on pixel dimensions and file size rather than DPI values.

Why does my image show "72 DPI (default)"?

This means the tool could not find DPI metadata in your file. Many image editors and cameras omit this information, or it may be stripped during compression. The tool defaults to 72 DPI, which is the standard screen resolution.

Will the image quality decrease after conversion?

The impact on quality depends on the mode you choose:

Change DPI Only mode: The pixels are re-encoded through Canvas, which may cause minor quality changes for JPEG (at 95% quality)
Resample mode: Upscaling adds interpolated pixels and downscaling removes them, which affects perceived sharpness

Important: Always keep your original high-resolution files as backups before performing any conversions.