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Free DPI converter — set 300 DPI and check print size in your browser

Free DPI Converter

Set image DPI to 72, 150, or 300, check print size in inches/cm, and download JPG/PNG with updated DPI tags — entirely in your browser. Free, no signup.

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Drag & drop JPG / PNG / WebP files here

or

0 files selected (max 20)

Current image & target DPI

Pixels
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Current DPI / PPI
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Print size (current)
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Print size calculator

Works with or without an uploaded image. Switch mode to go pixels → print size, or desired inches → required pixels.

Enter values and click Calculate.

Privacy: DPI reading, print math, and tag writes run entirely in your browser. Images are not uploaded to our servers.

Important: Changing DPI does not add detail or make a small photo “high resolution.” It only changes print-size math and metadata. JPG uses EXIF rewrite (pixels untouched); PNG updates the pHYs chunk; WebP is calculator-only.

Results

Preview File / print size Original Tagged Method

Free DPI Converter Online — Set 300 DPI & Check Print Size, No Upload

Need to set an image to 300 DPI for a print shop, Etsy POD file, or photo lab? This free DPI converter reads current resolution tags, calculates print size in inches and centimeters, and rewrites JPG/PNG DPI metadata — entirely in your browser.

Honest rule: changing DPI does not invent pixels. A 800×600 photo tagged 300 DPI still prints tiny. Use the calculator to see required pixels for your target inches, then resize or reshoot if needed. Pair with the image tiler for multi-up print sheets, marketplace listing prep for square product shots, or the EXIF remover when you need to strip GPS after tagging.

How to change image DPI / check print size

  1. Drop one or more JPG or PNG files (WebP works for the calculator).
  2. Review pixel dimensions and current DPI (or “not set”).
  3. Pick a preset — 72 screen, 150 draft, 300 print — or enter a custom DPI.
  4. Click Apply DPI & download (or use the calculator without downloading).
  5. Batch? Download a ZIP when multiple files are tagged.

When you need a DPI / print size tool

  • ✅ Print-on-demand / photo labs — meet a 300 DPI requirement without desktop software
  • ✅ Check print inches — know if your pixels will cover 4×6, 8×10, or A4 at target DPI
  • ✅ Reverse math — desired print size → required pixel dimensions
  • ✅ Batch tag — apply the same DPI to a folder of JPG/PNG files
  • ✅ Privacy — process locally; no upload, no signup

Why this free DPI converter?

  • ✅ Free, no signup
  • ✅ Browser-private — no upload to our servers
  • ✅ JPG EXIF + PNG pHYs rewrite (pixels unchanged)
  • ✅ Print size calculator (in / cm) both directions
  • ✅ Clear education: DPI tag ≠ more detail

Frequently Asked Questions (FAQ)

Q: Does changing DPI add resolution or detail to my image?

A: No. Changing DPI only updates metadata and print-size math (pixels ÷ DPI = inches). It does not create sharper pixels. To print larger at the same quality you need more pixels, not a higher DPI tag alone.

Q: How do I set an image to 300 DPI online for free?

A: Drop a JPG or PNG here, choose the 300 print preset, click Apply DPI & download. JPEG uses EXIF rewrite; PNG updates pHYs. Everything runs in your browser.

Q: How do I calculate print size from pixels and DPI?

A: Print inches = pixels ÷ DPI. Example: 3000×2400 at 300 DPI → 10×8 inches. Use the calculator for inches/cm or reverse (inches × DPI = required pixels).

Q: What if my photo has no DPI set?

A: Many phone and web images omit resolution tags. We show “not set” honestly; the calculator can assume 72 DPI until you pick 150 or 300.

Q: Does this DPI converter upload my images?

A: No. Reading DPI, print math, and JPG/PNG tag writes stay on your device.

Q: Can I change DPI on PNG and WebP as well as JPG?

A: JPG and PNG yes (EXIF / pHYs). WebP is calculator-only for now — no standard DPI tag rewrite in this tool yet.

Q: Is 300 DPI required for every print?

A: 300 DPI is common for close-view photo prints. Large posters often look fine at 150 DPI. Check your printer/shop — pixel dimensions matter more than the tag alone.

Q: Is the DPI converter free?

A: Yes — free with no registration.