Image to 300 DPI
Convert images to 300 DPI for print quality.
Source image
Target print size
ID & Passport (mm)
Image to 300 DPI — resize your image to the exact pixel dimensions for print quality
300 DPI (dots per inch) is the print industry standard for sharp, professional output — photo prints, brochures, ID photos, posters, and press-ready documents all require it. But "300 DPI" is not a fixed pixel count: it depends on the physical print size. A 4×6 inch photo at 300 DPI needs exactly 1200×1800 pixels. An A4 page needs 2481×3508 pixels.
This tool converts that math for you. Choose a preset print size (4×6 in, 5×7 in, 8×10 in, A4, US Letter, 11×17 in) or enter a custom size in inches, and the tool calculates the required pixel dimensions and resizes your image to match — entirely in your browser with no upload.
When to use this tool
- Submitting photos for printing services — Most online print labs (Shutterfly, Snapfish, local photo shops) require images at specific pixel dimensions for each print size. Upload an undersized image and you get blurry output. This tool ensures the pixel count matches exactly.
- Creating print-ready assets for clients — Designers frequently need to deliver images at 300 DPI for a specific format. Instead of opening Photoshop or GIMP, drop the image here, pick the format, and download the correctly sized file.
- ID and passport photos — Government photo requirements specify exact sizes in millimeters (e.g., 35×45 mm). The math: 35 mm ÷ 25.4 × 300 = 413 px wide. Use the custom input to enter the required dimensions.
- Magazine and editorial submissions — Publications specify images in inches at 300 DPI. This tool outputs the exact pixel count to match the spec.
How it works
- Upload any image (JPG, PNG, WebP, or other common formats).
- Select a print size preset, or enter a custom width and height in inches.
- The tool shows the exact output pixel dimensions (e.g., "1200 × 1800 px — 4×6 in @ 300 DPI").
- Click Resize to 300 DPI & Download. The image is resized using high-quality bicubic interpolation and saved as a JPEG at 95% quality.
Important: source image quality matters
Resizing cannot add detail that was not in the original photo. If your source image is 800×600 px and you resize it to 2481×3508 px (A4 at 300 DPI), the output will be blurry because the algorithm must invent pixels. Start with the highest resolution source you have. As a rule of thumb: your source should be at least as many pixels as the target dimensions — ideally more.
Privacy and browser‑side processing
All resizing runs locally in your browser. Your images never leave your device. No upload, no server round-trip, no account required.
Related: Image Resizer (free-form pixel resizing), Passport Photo Resizer (preset photo ID sizes), Crop Image.
FAQ
What print sizes are supported?
Built-in presets: 4×6 in, 5×7 in, 8×10 in, A4 (8.27×11.69 in), US Letter (8.5×11 in), and 11×17 in. You can also enter any custom width and height in inches.
How many pixels does 300 DPI produce?
The formula is: pixels = inches × 300. So a 4×6 inch photo at 300 DPI = 1200×1800 px. An A4 page = 2481×3508 px. The tool calculates this automatically when you select a size.
Will the output be blurry if my source image is small?
Yes, if your source image has fewer pixels than the target dimensions, the tool must upscale — which reduces sharpness. For best results, start with a high-resolution source that has at least as many pixels as the target size.
What format is the output?
The tool downloads a JPEG at 95% quality. This is the standard for print labs and provides an excellent balance of file size and image sharpness.
Is my image uploaded to a server?
No. All processing runs locally in your browser using the HTML5 Canvas API. Your images never leave your device.
Can I use a custom size for passport or ID photos?
Yes. Use the Custom option and enter the required dimensions in inches. For example, a standard 35×45 mm EU passport photo = 1.38×1.77 inches, which produces 413×531 px at 300 DPI.