What's the Best DPI for Scanning Old Photos?

DPI — dots per inch — is how densely the scanner samples the original. More DPI means more pixels, and more pixels mean more room to crop, enlarge, and repair later. But more is not always better: beyond a point you are just recording paper grain in a bigger file. The right number depends on two things — how big the original is, and what you want to do with the digital copy. The numbers below follow the same guidance published by the Library of Congress for scanning photographs: 300 DPI as the baseline for a same-size copy, and 400 to 600 DPI when you want to enlarge the result.

What DPI actually means

DPI only makes sense together with the size of the original. A 4×6 print scanned at 300 DPI becomes a 1200×1800 pixel image; the same print at 600 DPI becomes 2400×3600 — four times as many pixels in total, because the density doubles in both directions. A wallet print scanned at 600 DPI produces far fewer pixels than a large print at the same setting, which is why small originals need higher DPI. The useful target for an archive is a longest side of at least 3000 pixels — that is the rule of thumb used by digitisation guidance for family collections. DPI is a print setting, not a quality score: two files with the same pixel dimensions look identical on screen whatever DPI label they carry.

300 DPI: the everyday default

300 DPI is enough when the digital copy will be viewed on screen or printed at the same size as the original. It keeps files small and scanning fast, and it is the standard for documents and for photos you only want to share with family. Use it for a quick same-size reprint, for sharing on messaging apps, and for large prints where 300 DPI already gives you plenty of pixels. Its limit is flexibility: crop a face out of a 300 DPI scan and enlarge it, and you will see the pixels.

600 DPI: the safer choice for old photos

600 DPI is the recommended setting for most old photographs. It captures the fine detail in a standard 4×6 or 5×7 print, leaves room to crop one person out of a group, lets you enlarge to 8×12 without visible softness, and gives restoration work — removing dust spots, cracks, and fading — enough pixels to work with. The files are four times bigger than at 300 DPI, but for a family archive that is a fair trade: you scan a photo once, and 600 DPI keeps your options open for decades. If you are digitizing a whole album, 600 DPI is the setting to use — see how to digitize a family photo album for the project plan.

1200 DPI: only for very small originals

Go to 1200 DPI for wallet prints, passport photos, and tiny snapshots you plan to enlarge well beyond their original size. A 2×3 print at 1200 DPI gives you roughly the same pixel count as a 4×6 at 600 DPI — enough to print at 4×6 or larger. For normal-size prints, 1200 DPI adds file size and scanning time without adding visible detail: it records the paper texture and grain more faithfully, not the faces. The same applies to Polaroids and small prints, where the small original is the reason to go high, not the photo itself.

DPI and phone scans

A phone camera does not have a DPI setting — it captures pixels, and the DPI is decided when the image is saved or printed. What matters is capturing at your phone's full resolution: fill the frame with the photo, hold the phone steady, and shoot in good light, as in the old-printed-photos guide. A full-resolution phone photo of a 4×6 print typically holds 3000 pixels or more on the long side — the equivalent of a 600 DPI scan — which is why phone scanning works well for archiving. When you print or export, set the DPI to match your purpose: 300 for same-size, 600 for an enlargement.

Common mistakes to avoid

• Scanning everything at 1200 DPI. Huge files, slow scans, and no visible gain on normal-size prints.
• Scanning small prints at 300 DPI. Too few pixels to enlarge later — the one case where low DPI actually loses detail forever.
• Thinking DPI fixes a blurry photo. Higher DPI only records what is on the paper. A faded, grainy, or out-of-focus original stays that way at any setting.
• Upscaling instead of re-scanning. Enlarging a file in software invents pixels; it does not recover detail. Scan at the right resolution once.
• Saving the only copy as a small JPG. Keep a full-resolution master file, and make smaller copies for sharing from it.

Frequently asked questions

What is the best DPI for scanning old photos?
600 DPI for most prints. It captures enough detail to enlarge, crop, or restore later. Use 300 DPI for a same-size copy, and 1200 DPI only for wallet-size prints you plan to enlarge.

Is 300 DPI enough for scanning photographs?
Yes, for a same-size reprint or for sharing on screen. It is the minimum for a good copy, but it leaves little room to crop or enlarge later.

Should I scan old photos at 1200 DPI?
Only for very small originals, like wallet prints, that you want to enlarge. For normal 4×6 or 5×7 prints, 1200 DPI adds file size without visible extra detail.

Does higher DPI make a blurry photo sharper?
No. Higher DPI records more of what is on the paper — including the blur, grain, and fading. It cannot recover detail the original does not have.

What DPI should I use when scanning with my phone?
Phones capture pixels, not DPI. Shoot at full resolution with the frame filled by the photo — that is roughly the equivalent of a 600 DPI scan for a standard print — and set the DPI when you print or export.

Related guides

• How to Scan Old Printed Photos with Your Phone
• How to Scan Polaroids and Small Prints
• How to Digitize a Family Photo Album