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Aspect ratio & resize calculator

Calculate paired dimensions from ratios and browse social platform size presets.

Recent results

Saved locally in your browser only.

Filter by type

No saved results yet. Run the tool to capture output here.

Free — no login

Processed in your browser — files are not uploaded.

Width (px)

Height (px)

Lock aspect ratio

Ratio preset

Simplified ratio

16:9

Width (px)

1920 px

Height (px)

1080 px

Quick ratio chips

Platform	Size	Ratio
Instagram post	1080 × 1080	1:1
Instagram story	1080 × 1920	9:16
YouTube thumbnail	1280 × 720	16:9
Facebook cover	820 × 312	205:78
X header	1500 × 500	3:1
LinkedIn banner	1584 × 396	4:1

Frequently Asked Questions

No. It calculates pixel dimensions only — use Image Compressor to export new sizes.

Common ratios plus Instagram, YouTube, Facebook, X, and LinkedIn sizes.

No. All math runs locally.

Design

Aspect ratio & resize calculator

Calculate paired dimensions from ratios and browse social platform size presets.

Recent results

Saved locally in your browser only.

Filter by type

No saved results yet. Run the tool to capture output here.

Free — no login

Processed in your browser — files are not uploaded.

Width (px)

Height (px)

Lock aspect ratio

Ratio preset

Simplified ratio

16:9

Width (px)

1920 px

Height (px)

1080 px

Quick ratio chips

Platform	Size	Ratio
Instagram post	1080 × 1080	1:1
Instagram story	1080 × 1920	9:16
YouTube thumbnail	1280 × 720	16:9
Facebook cover	820 × 312	205:78
X header	1500 × 500	3:1
LinkedIn banner	1584 × 396	4:1

Frequently Asked Questions

No. It calculates pixel dimensions only — use Image Compressor to export new sizes.

Common ratios plus Instagram, YouTube, Facebook, X, and LinkedIn sizes.

No. All math runs locally.

Aspect ratio & resize calculator

Frequently Asked Questions

Does this resize my files?

Which presets are included?

Is data stored?

Aspect ratio & resize calculator

Frequently Asked Questions

Does this resize my files?

Which presets are included?

Is data stored?