Postcard Mailing Size Checker
Postcard Mailing Size Checker helps you preflight measurable file, dimension, duration, text, or upload fields before using an official or platform workflow.
The checker returns pass, warn, and fail items, a copy-all result, source references, and local repair links where a TextFaker tool can help.
Choose a file
The browser fills file name, size, and available media dimensions locally. Add missing fields on the right.
Preflight fields
References
- USPS Cards and Postcards
USPS business mail reference for postcard and card mailing dimensions.
- GS1 Barcode Standards
Official GS1 overview of barcode standards and implementation guidance.
- ISO 12647 Print Standards
ISO reference for process-control standards used in print production workflows.
Repair links
No local repair tool is mapped for this checker yet. Use the failed check labels to update the source file in your editor or platform export settings.
Postcard Mailing Size Checker Guide
What this preflight checks
Postcard Mailing Size Checker is a base verification utility for measurable fields, not a human review or official approval service. It reads local file metadata where the browser exposes it and accepts manual values for fields that cannot be safely inferred in the browser.
Common checks include print resolution, dimensions, contrast, and file format fields that can be measured before a production handoff.
- Print asset format: File extension should be one of: pdf, jpg, jpeg, png, tif, tiff.
- Print resolution: Print resolution should be at least 300 DPI when a print asset requires DPI metadata.
- Minimum dimensions: Dimensions should be at least 900 x 900 pixels.
- Contrast ratio: Measured contrast ratio should be at least 4.5:1.
How to read the result
A pass item means the provided value met the local rule. A warn item means the checker needs more source data, such as page count, DPI, duration, or pasted markup. A fail item names a measurable value that is outside the configured preflight rule.
Use the copy-all button to save the full report with labels, input values, checks, and reference names. That makes it easier to compare fixes before uploading again.
- Pass: the provided measurable value fits the configured rule.
- Warn: the checker needs more local data before it can decide.
- Fail: fix the file, dimensions, duration, text, or naming issue before submission.
Sources and variants
Postcard Mailing Size Checker stores official or standards references with the base checker. Country, region, or platform variants should be added as data presets only when their source URL, last-verified date, and allowed jurisdiction are present.
This base checker does not publish country variants unless a future preset includes an approved jurisdiction and source-backed rules.
- Source policy: official-preferred.
- Base variant count planned: 0.
- Demand proof URLs stored: 2.