Increase DPI of Image Online

Set your image's DPI to 72, 150, 300, 600 — or any custom value a printer, stock site, or submission form asks for. Batch upload, instant conversion, ZIP download.

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DPI Converter

Drop one or more images below. Your files never leave this device.

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Drop images here

or click to browse  ·  JPG, PNG, WEBP, BMP, GIF

How to increase DPI of an image online

1

Upload your image

Drag and drop a JPG, PNG, WEBP, BMP or GIF file — or a whole batch at once. The tool reads each image's current DPI and dimensions automatically.

2

Pick a target DPI

Choose 72, 150, 300, 600 DPI or type a custom value. Optionally convert to another format or apply the mild enhance filter.

3

Convert and download

Hit "Convert DPI" and download each image individually, or grab everything as one ZIP file. Done in seconds.

That is the entire workflow for how to increase DPI of an image — most people finish in under a minute. The only decision that needs thought is which DPI value to pick. If a form, printer, or portal names a number, use exactly that number. Otherwise, follow this rule of thumb:

Choosing the right DPI value

  • 72 DPI — the legacy screen value. On displays only pixel dimensions matter, but some web forms still ask for it.
  • 150 DPI — the sweet spot for large-format prints, posters, and banners viewed from a few feet away. See our 150 DPI guide for details.
  • 300 DPI — the standard for photo prints, books, magazines, and stock agencies. Our 300 DPI converter guide walks through it step by step.
  • 600 DPI — fine-art prints, line art, and high-end scans. Details in the 600 DPI converter guide.
  • Custom — type any value from 1 to 2400 when a submission portal specifies something unusual.

Why does DPI matter? An honest explanation

DPI — dots per inch — is print metadata, not a measure of image quality. It tells a printer how many pixels to squeeze into each inch of paper. A 3000×2400 pixel photo saved at 300 DPI prints at 10×8 inches; the same photo at 72 DPI would print at roughly 42×33 inches — with the exact same pixels.

Here is the honest part: changing DPI does not add detail, sharpness, or quality that was not already in the photo. If your source image is small or blurry, no DPI number will fix that. What this tool does — and does well — is set the DPI value that print shops, passport portals, stock agencies, and submission forms require, so your file passes their checks.

Pixel dimensions still rule. For a truly sharper print, you need more pixels. Use our image resizer if you need to change the pixel size too.

DPI vs. resolution vs. image quality

These three terms get mixed up constantly, so here is the plain-English version:

  • Resolution = how many pixels the image contains (for example 4000×3000). This is the real measure of captured detail.
  • DPI = a single number stored in the file header telling a printer how densely to place those pixels on paper. Change it and the pixels don't move — only the printed size changes.
  • Image quality = how good the photo actually looks: sharpness, noise, color, compression artifacts. No DPI value can improve any of this.

So when someone asks how to change the DPI of an image, what they usually need is the metadata number updated to satisfy a requirement — exactly what the converter above does. If instead your photo is blurry or tiny, no DPI setting will rescue it; you need a higher-resolution source file.

Where a specific DPI is required

Most people searching for a DPI changer land here because some system rejected their file. These are the usual suspects:

  • Print shops & photo labs — typically demand 300 DPI at the final print size. A 6×4″ print at 300 DPI needs 1800×1200 pixels; stamping “300 DPI” on a smaller file won't make it print-ready.
  • Passport & visa portals — many government upload forms validate DPI metadata and reject photos that don't carry it. JPG is the safest format here.
  • Stock photo sites — agencies often list 300 DPI in contributor guidelines as shorthand for high-resolution, print-ready files.
  • Print-on-demand — merch and marketplace templates specify pixel dimensions plus a DPI value, and both must match for the design to be accepted.
  • Academic & legal submissions — journals and courts sometimes require 300 or 600 DPI scans of figures, exhibits, and documents.

Which image formats keep DPI metadata?

Not every format can store a DPI value. Here is how the common ones behave with this tool:

  • JPG / JPEG — full support via JFIF and EXIF headers. When the format is unchanged, the tool rewrites only the DPI metadata — your pixels stay byte-for-byte identical.
  • PNG — full support via the pHYs chunk, also rewritten losslessly.
  • WEBP — no standard DPI field exists. The tool warns you, and the exported file simply won't carry a DPI value.
  • BMP — stores pixels-per-meter in its header, but software support is inconsistent; don't rely on it for DPI workflows.
  • GIF — carries no DPI metadata at all.

Rule of thumb: if a printer or portal demands a DPI value, deliver a JPG or PNG. If your source is WEBP, run it through the format converter first.

Key features of this DPI increaser

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Fast and simple

Upload, pick a DPI, download. No accounts, no watermarks, no waiting in a queue.

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Batch conversion

Process dozens of images in one go and download them all as a single ZIP archive.

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Private by design

All processing happens locally in your browser. Your images are never uploaded to any server.

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Format options

Keep the original format or convert to JPG, PNG, WEBP, or BMP during the same step.

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Optional enhance

A mild denoise/sharpen pass can make scans and screenshots look a touch cleaner — without changing colors.

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Lossless metadata edit

When the format stays the same, only the DPI header is rewritten — your pixels are untouched.

Frequently asked questions

Does increasing DPI make my image sharper?
No. DPI only changes how large the image prints on paper. It cannot create detail that was not captured. If a form demands "300 DPI", this tool sets that value correctly — but a low-resolution photo stays low-resolution.
Are my images uploaded to a server?
No. Every tool on this site is pure JavaScript running in your browser. Files are read locally and never transmitted anywhere.
Which formats keep DPI metadata?
JPEG (via JFIF/EXIF headers) and PNG (via the pHYs chunk) store DPI. WEBP and BMP have no standard DPI metadata field, so exporting to those formats will not carry a DPI value — the tool will warn you.
What DPI should I choose for printing?
Most print shops ask for 300 DPI. Large-format posters often use 150 DPI. Screens only care about pixel dimensions — "72 DPI" is a legacy label. When in doubt, use whatever the submission guidelines specify.
How do I change the DPI of a picture on my phone?
The same way as on a computer: open this page in your phone's browser, tap the upload area to pick a photo, choose the target DPI, and download the result. No app install needed.
Will converting to 300 DPI improve my print quality?
It will satisfy the 300 DPI requirement, but it won't add sharpness. True print quality comes from pixel dimensions — a 1200×1800 px photo prints a crisp 4×6″ at 300 DPI, while a 400×600 px photo won't, regardless of the DPI tag.
What is the difference between DPI and PPI?
DPI (dots per inch) originally described printer dots; PPI (pixels per inch) describes screen pixels. In image files the terms are used interchangeably — the metadata value this tool writes is what most software calls DPI.
Can I lower DPI, for example from 300 to 72?
Yes. Type any value from 1 to 2400 in the custom field. Lowering DPI only changes the metadata number (and therefore the implied print size); your pixels are untouched.
Why does my PNG show "no DPI tag"?
Many apps export PNGs without writing the pHYs chunk, and screenshots almost never include one. It's harmless — the pixels are unaffected. Use the converter to stamp in whatever value you need.
Does this tool change my image's pixel dimensions?
No. The DPI converter only rewrites the DPI metadata. If you also need different pixel dimensions, use the image resizer first.
Is there a file size or quantity limit?
No hard limit — processing happens on your device, so it depends on your browser's memory. Batches of dozens of typical photos work fine.
Can I convert a WEBP image to 300 DPI?
You can convert the WEBP to JPG or PNG and set 300 DPI in one step with this tool. But a file that stays in WEBP format cannot carry a DPI value, since WEBP has no standard DPI field.
What DPI do I need for a poster?
Large posters viewed from a distance usually print at 150 DPI; smaller posters viewed up close use 300 DPI. Check with your print shop — then see our 150 DPI guide.
Does DPI affect how my image looks on screen?
No. Screens ignore DPI metadata completely and display images pixel-for-pixel (scaled by the OS/app). DPI only matters for printing and for forms that validate it.
Why was my photo rejected for "wrong DPI"?
Most likely the file had no DPI tag at all (common with screenshots and phone exports) or a different value than required. Check the current value with our DPI checker, then set the required one here.
Is this DPI converter really free?
Yes — free with no account, no watermarks, and no upload queues. Because everything runs in your browser, there are no server costs to pass on to you.

See all FAQs →

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Step-by-step DPI guides

How to Increase DPI

The complete guide to raising image DPI online.

Convert to 300 DPI

Make JPG and PNG files print-ready at 300 DPI.

600 DPI Converter

Set images to 600 DPI for fine-art printing.

Change DPI of Image

Raise or lower the DPI metadata of any photo.

Make Image 150 DPI

150 DPI for posters and large-format prints.