Guide · 5 min read · updated 2026-04-27
How to resize photos for email
What dimensions to resize photos to before emailing them, and how to do it on iPhone, Android, Mac, Windows, or in your browser.
Phone cameras shoot at 4032×3024 (12 MP) or higher. Most email recipients view the photo on a phone screen at 1170 px wide: every pixel beyond that is wasted bandwidth. Resizing before sending makes your email smaller, faster to download, and far less likely to bounce.
What dimensions should you target?
| Long edge | Looks good on | Typical JPEG size |
|---|---|---|
| 1024 px | Phones and laptops at thumbnail / inline view | ~150 KB |
| 1600 px | Phones full-screen; laptops at half-screen | ~400 KB |
| 2000 px | Any phone; most laptop screens | ~700 KB |
| 2560 px | 4K-ish, the universal default | ~1.1 MB |
| 3500 px | Large prints, archive copies | ~2.5 MB |
| Original (4032+ px) | Editing, RAW workflows, very large prints | 3–8 MB |
For email, anything beyond 2560 px is generally diminishing returns. Stick with that as a default; drop to 2000 px if you're sending a big batch and need every byte.
Method 1: browser-side, no upload
The fastest path is EmailPhotos.com. Drag photos in, each one is resized + recompressed in a Web Worker, totals shown live in the footer. Default is 2560 px max long edge. To change it, open Settings and pick Smaller (slimmer dimensions) or Highest (keeps full resolution where possible).
Method 2: macOS Preview
- Open the photo in Preview.
- Tools → Adjust Size…
- Set Width to 2560 px (height auto-adjusts).
- File → Export… Choose JPEG, slide quality to about 70 %.
Bonus: Preview can do this on multiple files at once. Cmd-A in the sidebar to select all → Tools → Adjust Size applies to every selected.
Method 3: Windows Photos app
- Right-click the photo → Open with → Photos.
- Click the ··· menu → Resize image.
- Pick Define custom dimensions, enter 2560 for width.
- Quality slider at 80 % is a good default.
- Save as a copy.
Method 4: iPhone
iOS doesn't expose a "resize" command directly in Photos. Two options:
- Mail's built-in resize. Photos → Select → Share → Mail. Once Mail opens, the size picker appears at the top of the keyboard (Small / Medium / Large / Actual Size). "Large" maps to ~1500 px long edge.
- Browser-side. Open emailphotos.com in Safari, tap to pick photos, the page resizes them and the iOS share sheet opens with everything ready.
Method 5: Android
Most Android galleries don't ship a resize feature, but Google Photos does:
- Open the photo in Google Photos.
- Tap Share → some social apps offer "share at lower resolution" inline.
- For more control, open emailphotos.com in Chrome: the page resizes and shares to Gmail in two taps.
Resize vs. compress: which one matters?
Both reduce file size, but in different ways:
- Resize reduces pixels. A 4032×3024 photo at 2560×1920 is 60 % fewer pixels: and roughly 60 % smaller file at the same JPEG quality.
- Compress reduces JPEG quality. A photo at quality 0.95 vs 0.80 has the same dimensions but is roughly half the file size.
Doing both is better than picking one. Resize to 2560 px and recompress at quality 0.80 for a result that's typically 6× smaller than the original with no perceivable loss on screens.
Frequently asked
What size should I resize a photo to before emailing?
For most emails, a 2000–2560 px long edge is the sweet spot: visually identical to the original on screens, but a fraction of the file size. For thumbnails or quick previews, 1024 px works. Avoid going below 1280 px unless you're really squeezed for size.
Is resizing the same as compressing?
No. Resizing reduces the pixel dimensions (3024×4032 → 2000×2667). Compressing reduces file size at the same dimensions, by re-encoding at lower JPEG quality. Both shrink the file. Doing both: resize and recompress: gets the best result.
What's the best resolution to email a photo?
On a phone, 2000 px wide displays sharply on any model. On a 1440p laptop, 2560 px wide is still pixel-perfect. 4K displays start to show the difference at 2560 px but only when zooming. 2560 px is the lowest-friction default.
How do I resize a photo on iPhone for email?
The Mail app has a built-in size picker (Small / Medium / Large / Actual Size) that appears when you attach photos via Photos → Share → Mail. For more control, use a browser tool like EmailPhotos.com that resizes and compresses with one drop.
Will resizing reduce quality?
Resizing throws away pixels: that data is gone. But on a screen, you can't see the difference between a 4032 px and a 2560 px image at typical viewing distance. Quality only matters if recipients zoom or print large.
Related guides
Email large photos
Three reliable ways to email large photos: compress in your browser, use a cloud share link, or send a manual zip. Comparison + step-by-step.
Compress photos for email
Compress photos to fit a 25 MB email attachment limit, in your browser, without uploading. Works for JPEG, HEIC, PNG, and WebP on every modern phone.
Send multiple photos
Attach 5, 50, or 500 photos to a single email so they actually arrive. The smart way (compress in the browser), the manual way, and provider-specific limits.