Tone CaliperSee what every crop keeps
Drop a photo and flip through Instagram, print, film, and cinema ratios — the parts you'd lose fade away, per ratio, before you commit. Adjust the crop if the auto framing isn't right, then export at full resolution.
Drop a photo to see what each ratio keeps.
Browse aspect ratios
Common aspect ratios, and where they're used
An aspect ratio is the shape of the frame — width against height. Cameras, platforms, and print sizes each settled on different shapes, which is why a photo almost never moves between them uncut.
| Ratio | Where you meet it | Common pixel size |
|---|---|---|
| 1:1 | Instagram square, album covers, 6×6 medium format | 1080 × 1080 |
| 4:5 | Instagram portrait, 8×10 prints | 1080 × 1350 |
| 9:16 | Stories, Reels, TikTok, Shorts | 1080 × 1920 |
| 16:9 | YouTube, X, TVs, presentations | 1920 × 1080 |
| 3:2 | 35mm film, most mirrorless and DSLR sensors, 4×6 prints | 6000 × 4000 |
| 4:3 | Four Thirds cameras, most phone photos | 4032 × 3024 |
| 5:4 | 8×10 and 16×20 prints, large-format film | — |
| 7:5 | 5×7 prints | — |
| 2.39:1 | Cinematic widescreen ("scope") | — |
How much of a photo does a crop lose?
Compare the two shapes. The share you keep is the smaller ratio divided by the larger one; everything else is trimmed from the long sides. Two examples with a standard 3:2 camera file:
- Portrait 2:3 → Instagram 4:5 — you keep about 83%. A modest trim from top and bottom; most compositions survive it.
- Landscape 3:2 → Instagram 4:5 — you keep barely 53%. Nearly half the frame goes, which is why landscape photos so often feel butchered on Instagram. Shooting (or cropping) with the target shape in mind is the only real fix — and previewing the loss first is what this tool is for.
Print sizes and their aspect ratios
Standard print sizes span several shapes, and none of the popular "middle" sizes match a 3:2 camera file — the trim below is what the lab will take if you don't choose the crop yourself.
| Print size | Aspect ratio | From a 3:2 camera file |
|---|---|---|
| 4×6 | 3:2 | No crop |
| 5×7 | 7:5 | ≈7% trimmed |
| 8×10 | 5:4 | ≈17% trimmed |
| 11×14 | 14:11 | ≈15% trimmed |
| 16×20 | 5:4 | ≈17% trimmed |
| 20×30 | 3:2 | No crop |
| A4 / A3 | 1:√2 | ≈6% trimmed |
Frequently asked questions
What aspect ratios does Instagram use?
Feed posts can be square (1:1, 1080×1080), portrait up to 4:5 (1080×1350), or landscape up to 1.91:1. Stories and Reels are 9:16 (1080×1920). Portrait 4:5 takes up the most screen space in the feed, which is why it's the most common crop.
Why does an 8×10 print crop my photo?
Most cameras shoot 3:2, but an 8×10 print is 5:4 — a noticeably squarer shape. Printing a 3:2 file at 8×10 trims about 17% of the frame. Sizes that match the sensor, like 4×6 or 20×30, keep everything.
Does cropping reduce image quality?
Cropping removes pixels but doesn't degrade the ones that remain. What matters is how many pixels are left for your output: a 24-megapixel photo cropped to 4:5 still has far more than an 8×10 print or an Instagram upload needs. This tool exports at the crop's full remaining resolution.
Is my photo uploaded to a server?
No. The photo is opened directly by your browser and never leaves your device — there is no upload, no account, and nothing stored. Previews, cropping, and export all happen locally.
How do I crop without losing the important part?
Compare ratios before committing: shapes close to your photo's native ratio lose the least. When you do have to cut, use Adjust crop to pan and zoom so the subject stays inside the frame — the rule-of-thirds grid helps placement.
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