Sign: Formats, File Types, and Size Limits

A practical reference for sign pdf: supported input formats, size limits, and how to get the best output. Every file stays on your device.

Published August 28, 20264 min read

Formats, file types, and size limits for Sign

Knowing what Sign PDF accepts makes your workflow smoother.

The tool works with PDF.

Format	MIME type	Status
PDF	`application/pdf`	Supported

Sign PDF processes up to 50 MB. Because everything runs in your browser, the practical limit is your device's memory — not a crowded server.

Use the newest formats you can for the best quality-to-size balance
When quality matters, choose lossless options; when sharing, choose compact ones
Keep a backup of your original input before processing

Sign PDF handles PDF and up to 50 MB with no file ever leaving your device.

Sign PDF works with PDF.

Sign PDF handles up to 50 MB because processing happens locally in your browser.

Yes — process as many as you need. There are no daily or monthly caps.