WebToolArcBrowser-local limits
Canvas-based export is browser dependent. PNG is broadly available; JPEG/WebP quality and support can vary, and metadata may not be preserved through canvas re-encoding.
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Image DPI Checker
Check what DPI/PPI metadata an image actually stores, then separate that metadata from real pixel dimensions, effective print PPI and print-size readiness — locally in your browser.
Image DPI, PPI & print-resolution workbench
Read embedded resolution tags, inspect the actual pixel grid, and judge print readiness at the size you intend to use.
Drop images here, click to browse, or paste from the clipboard
JPEG, PNG, WebP, BMP and browser-decodable images · up to 25 files · 80 MB each · local processing
Choose one or more images. Files stay in this browser tab.
—
—Format
—Pixel dimensions
—Megapixels
—Aspect ratio
—File size
—Embedded DPI/PPI
—Metadata source
Effective PPI at your intended print size
Pixel dimensions divided by physical inches determine effective PPI. The embedded metadata does not override this math.
Do not confuse metadata with resolution. Changing a 72-DPI tag to 300 DPI without resampling does not add a single pixel or restore detail.
—Horizontal effective PPI
—Vertical effective PPI
—Limiting effective PPI
—Practical quality band
—Pixels required at goal
—Pixel shortfall
—Metadata vs effective
Load an image to calculate effective PPI.
Print size at common densities
See the physical size the current pixel grid yields without resampling.
| Density | Print size | Print size |
|---|---|---|
| Choose an image. | ||
Standard print-size suitability matrix
For each size, the checker chooses the better portrait/landscape orientation and computes the limiting effective PPI.
| Print size | Effective PPI | Quality | Against selected goal |
|---|---|---|---|
| Choose an image. | |||
Multi-image audit
Compare up to 25 files without uploading them. Open any row as the active image or export a CSV for a print-production checklist.
| File | Pixels | Embedded PPI | Max size @ 300 PPI | File size |
|---|
Session-only recent audits
Keep up to six snapshots while comparing candidate images. Nothing is written to localStorage.
Truth & privacy boundary
What this tool can prove: the decoded pixel dimensions, file size, supported embedded density tags, and print math calculated from those values.
What it cannot prove: printer sharpness, paper/ink quality, interpolation quality, color accuracy, press settings, or that a low-resolution original becomes detailed merely because a DPI field says 300.
What it cannot prove: printer sharpness, paper/ink quality, interpolation quality, color accuracy, press settings, or that a low-resolution original becomes detailed merely because a DPI field says 300.
Selected files are read by browser APIs in this tab. WebToolArc does not intentionally upload them for this calculation.
Core image workflows
Use a flagship page for the highest-demand resize, compression, crop and conversion jobs; specialist image tools remain available from the full hub.
Image ResizerResize by pixels or percentageImage CompressorReduce file size with controlsImage CropperCrop visually or by coordinatesImage ConverterConvert JPG, PNG and WebPJPG to PNGConvert JPEG into PNGPNG to JPGExport PNG as JPEGHEIC to JPGConvert phone HEIC/HEIF photosWebP to JPGExport WebP as JPEG
Image DPI checks that separate metadata from real print detail
DPI vs PPI
PPI describes image pixels per printed inch; printer DPI technically describes ink dots. Image files commonly store a resolution value that software labels DPI, but the file's pixel grid is the real raster detail available.
Where embedded density comes from
JPEG can carry JFIF or EXIF resolution values, PNG can store pixels-per-meter in a pHYs chunk, WebP can carry EXIF, and BMP may contain pixels-per-meter fields. The workbench names the source it actually found.
Effective PPI is print-size dependent
A 3000-pixel-wide image printed 10 inches wide has 300 effective PPI. Print it 20 inches wide and it has 150 effective PPI, even if the metadata tag itself still says 300.
Quality bands are practical, not magical
300 PPI is a useful high-detail print target, while lower densities may be acceptable for larger viewing distances. Subject matter, sharpening, printer behavior and viewing conditions still matter.
Batch review catches production mistakes
When multiple assets must ship together, the CSV audit makes mismatched pixel sizes, missing density metadata and undersized originals easier to spot before export or print.
Changing a tag is not resampling
Rewriting DPI metadata changes the assumed physical size but does not create pixels. Resampling creates a new pixel grid, and its quality depends on the source and interpolation method.