ImgExact

Image size and dimensions checker

Everything about a file, before you upload it somewhere: bytes, pixels, ratio, megapixels, format, transparency, metadata presence and print size.

Images never leave your device No signup, no email No file limits or watermarks Works offline once loaded

Last reviewed . Runs locally — your images never leave your device.

How it works

  1. Drop (or paste) any image file.
  2. The checker reads the header and pixel data locally — no upload.
  3. Review file size, dimensions, ratio, megapixels, format, MIME type, transparency, metadata presence and print size at 300/150 DPI.

Common requirements

  • Upload rejected? — Compare the file against the portal limit before editing anything.
  • Print at 300 DPI — Check the pixels you have against the inches you need.
  • Before resizing — Note the original dimensions so the choice of output size is informed.
  • Before sharing — See whether GPS or EXIF metadata is embedded in the file.
  • Retina / 2× displays — Confirm a file is large enough for high-density screens.
  • Unknown file — Identify what a file really is when the extension lies.

How to check an image size, dimensions and resolution before uploading

Two different numbers are both called "the size". File size is bytes on disk — what upload limits care about. Image size is the pixel grid — what print and display care about. This page shows both at once, so you can check image dimensions and file size in a single glance.

If the question is what size is my image, the answer looks like "4032 × 3024 pixels, 2.4 MB, 12.2 megapixels", and it appears the moment the file is dropped. Nothing is modified, so checking a file can never damage it.

Working towards print? The panel reports print size at 150 and 300 DPI, which is what a print shop means when it asks for a resolution. To check DPI of an image you did not create, read the embedded value and compare it with the physical size you need — the DPI tool does that arithmetic and can write the density field.

This image resolution checker also surfaces the details that get uploads rejected: format, MIME type, transparency, aspect ratio in reduced form, and whether EXIF or GPS data is present. Check first, then reach for the right tool with real numbers in hand.

Supported formats

JPEG, PNG, WebP, AVIF, GIF, BMP — even when you are not sure what your file is.

Full read-only analysis; works with files up to 200 MB.

Privacy

Everything happens in your browser: the image is decoded, transformed and encoded locally. Nothing is uploaded, and no filename, pixel data or metadata is sent anywhere. Read more on the privacy page.

Technical methodology

  • Dimensions and format are read from the file header (PNG IHDR, JPEG SOF, WebP VP8/VP8L/VP8X, GIF logical screen descriptor) and cross-checked against actual decode results.
  • Metadata presence (EXIF, GPS, XMP, PNG text chunks) is detected by parsing the file structure locally; GPS values are shown to you and never transmitted anywhere.
  • Print size estimates assume the standard 300 DPI (print) and 150 DPI (large format) references, clearly labeled as estimates.

Known limitations

  • Print size is an arithmetic estimate from pixels and reference DPI — it does not know your print shop requirements.
  • HEIC files show metadata only in browsers that can decode them.

Go deeper: image size vs dimensions vs DPI

Compress image Quality modes with a clear before/after report — no target size needed. DPI converter & print size Correct PPI handling: embed print density and calculate physical sizes. Image to Base64 Data URI and raw Base64 output with size math — fully offline.

Frequently asked questions

Can I check an image without modifying it?

Yes — this tool is read-only. Nothing is changed, nothing is uploaded, and it works as a sanity check before any other tool.

What does "megapixels" mean?

Width × height in millions of pixels. A 4032×3024 photo is about 12.2 megapixels. More megapixels allow larger prints, not necessarily better photos.

Does the checker tell me if my photo has GPS data?

Yes, it detects whether location metadata is present and shows the values locally, so you can decide whether to strip it with the metadata tool.

Is there a file size limit?

No practical limit for reading — even 200 MB files are inspected. The analysis works on both mobile and desktop browsers.

What size is my image — bytes or pixels?

Both are reported, because they answer different questions. Bytes decide whether an upload limit is met; pixel dimensions decide whether the image is big enough for print or for a retina screen. The report shows file size, dimensions, ratio and megapixels together.