LetterAgent
Mail physical letters by just asking your AI assistant.
Home > Guides > Fax a Phone Photo
Yes, but fax was built for black-and-white documents, not color photos, so a raw phone photo usually comes out as a gray smear. Convert the image to high-contrast black and white, crop tight, and bump the brightness before faxing. The result is a serviceable printout: readable detail, no color, and roughly the look of a photocopy.
A fax machine is a strictly monochrome medium. It prints dots of black ink or leaves the paper white. There is no gray ink, no color, nothing in between. Your full-color photo has to be flattened into black dots before it ever travels the phone line, and that flattening is done by the sending software, not by you. Blue skies turn into muddy gray. Skin tones merge together. Subtle gradients collapse into banded blobs. The photo is not broken; the medium just cannot carry that much information.
There is a second, less obvious problem: fax resolution is lopsided. The original fax standard scans at about 200 dots per inch horizontally but only about half that vertically, so vertical detail survives better than horizontal detail. Thin horizontal lines, like eyelashes or horizon edges, are the first things to vanish. Diagonal edges come out jagged. If your photo is mostly fine horizontal texture, it will read as noise on the other end.
| Color photo, straight from the camera | Photo prepared for fax | |
|---|---|---|
| Color | Full color in the file | Converted to high-contrast black and white first |
| Detail | Fine detail and gradients | Bold shapes; gradients simplified |
| Brightness | Often dark in shadows | Shadows lifted so nothing reads as solid black |
| Framing | Full scene with margins | Cropped tight on the subject |
| Result on the receiving machine | Gray smear; the subject may be unrecognizable | A readable printout, like a photocopy |
Five minutes of prep makes the difference between a recognizable image and a gray rectangle:
Yes, if the photo is on paper rather than in your camera roll. A scanning app's "document" mode straightens perspective, flattens the image, and applies the black-and-white conversion in one pass. One quirk to know: photographing a printed photo with your phone creates moire, those wavy interference patterns, because the phone's sensor grid clashes with the print's dot pattern. A real scan avoids this entirely, which is why scanning beats re-photographing every time.
Anything where color carries meaning. A photo of a color-coded chart, a rash on skin (where redness matters), or a document with red "do not sign here" markings will lose exactly the information you needed to send. In those cases, describe the color information in text alongside the fax, or find another channel entirely.
With LetterAgent, you can send a fax by asking your AI assistant: you get a per-fax quote with the page count verified, you approve the exact total, you pay once through Stripe, and the fax is sent to US and Canadian fax numbers only. Pricing is quoted up front and you approve the exact price before anything is sent. Fax through LetterAgent is currently in testing, so treat it as available in testing rather than something you can count on today.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com