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Postcard Size Photo Maker

Resize or convert any photo to postcard size — exactly 4x6 inches, 600x900 px — for free, instantly, and 100% privately right in your browser.

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Upload your images (0/12)

Or drag & drop images in this page

Supports JPG, JPEG, PNG, WEBP, PDF, HEIC formats

Images Never Leave Your Device

Or try with sample images:

100% Free & no login required. Your images never leave your device.

How It Works

Step-by-step guide to resize for postcard size photo to exact specifications

Upload Your Photo

Drag and drop a JPG, JPEG, PNG, or WebP file, or pick one from your camera roll. This also works if you're starting from an existing passport size photo you want turned into a postcard.

Postcard Size Already Applied

The target is pre-set to the standard 4x6 inch postcard size, so there's nothing to type in. If your photo's proportions don't match, pick Crop, Fill Frame, Add Padding, or Stretch image to fit it.

Preview And Download

Check the preview against the original, then download. Everything ran locally in your browser, so the photo was never uploaded anywhere while it was resized to postcard size on your device.

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Why Choose Imresizer?

Fast, secure, and completely free image resizing

  • Exact Postcard Size Every Time

    Every photo lands at precisely 4x6 inch (600x900 px at 300 DPI), the standard postcard size print shops and mailing services expect — no manual pixel math needed.

  • Passport To Postcard Converter

    Already have a passport size photo? Upload it and convert it straight to postcard size — the tool rescales it to the new frame without you starting from a fresh original.

  • Built For Mailing And Printing

    This postcard size photo maker outputs a file sized for both a home printer and a professional photo lab, so the same download works for a print run or a single mailed card.

  • Files Never Leave Your Device

    Resizing runs entirely inside your browser. Your photo, whether it's a family picture or a passport scan you're converting, is never uploaded to a server.

  • Batch Convert Up To 12 Photos

    Drop in a whole set of photos and resize them all to postcard size in one pass — handy for a photo shop order or a batch of cards for the same mailing.

  • Print-Ready Output

    Download at full print resolution so edges stay sharp when a photo lab trims and finishes the card. Nothing looks soft or pixelated at the standard postcard photo size.

  • Free With No Daily Cap

    Make as many postcard size photos as you need — no account, no watermark, and no limit on how often you come back to convert another batch.

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Frequently Asked Questions

Everything you need to know about image resizing

What is the standard postcard size?

The standard postcard size is 4x6 inches, which equals 600x900 pixels at 300 DPI. That's the size most mailing services and photo labs expect, and it's the size this tool is pre-set to.

How do I resize an image to postcard size photo?

Upload your photo and the dimensions are already applied to postcard size — 4x6 inches. Preview the result, choose a fit mode if the proportions don't match, then download. The whole process takes seconds.

Can I convert a passport size photo to postcard size?

Yes. Already have a passport size photo? Convert it directly to postcard size here — upload the passport photo and the tool rescales it to the 4x6 inch postcard frame in the same step, no separate conversion needed.

What happens if my photo's proportions don't match postcard size?

You get four fit modes to choose from: Stretch image forces the exact 4x6 frame and can distort a face-heavy shot, Crop keeps proportions but trims what falls outside the frame, Add Padding keeps the whole photo and fills empty space with colored bars, and Fill Frame scales up to cover the frame and trims overflow. For a portrait or a passport-to-postcard conversion, Crop or Fill Frame usually looks best since neither one stretches faces.

Is this postcard size photo maker free?

Every part of it is free — no account, no trial, and no watermark on the download. Make as many postcard size photos as you need at no cost.

Can I resize several photos to postcard size at once?

Yes, load up to 12 photos and convert them all to postcard size in a single batch — useful for a print order or a set of cards headed to the same mailing.

Will resizing to postcard size reduce photo quality?

There's some quality trade-off any time a photo is rescaled, but the tool keeps detail as sharp as the target size allows. The preview shows the finished postcard size photo before you download, so you can check it first.

What image formats can I upload for a postcard photo size?

JPG, JPEG, PNG, and WebP files all load directly. The finished file downloads as a standard JPG ready for printing or mailing.

Is my photo uploaded to a server?

Nothing is uploaded. Resizing to postcard size happens entirely inside your browser on your own device, so your photo — including a passport scan you're converting — stays private from start to finish.

Can I print the postcard size photo at a photo shop?

Yes. The download is sized at 4x6 inches, 600x900 pixels at 300 DPI, which matches what most photo labs and print shops ask for when printing a postcard.

Is postcard size the same as a standard 4x6 print?

They're the same dimensions — 4x6 inches — but a mailed postcard usually needs a plain back for the address and stamp, while a regular 4x6 print doesn't. This tool sizes the front image; add the mailing side separately with your printing service.

Does this postcard size photo maker work on mobile?

Yes, it runs in any modern mobile browser. Pick a photo straight from your phone's camera roll, resize it to postcard size, and save the result to your device without installing an app.
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