Contents
| No. | Envelope Size (mm) | Reason for Choice | Advantages | Disadvantages | Application Scope |
|---|---|---|---|---|---|
| 1 | 210 x 297 (A4) | International standard, easy to use in printing and transactions | Common, easy to print, suitable for many types of printers | Medium size, not outstanding | Office, contracts, quotes, administrative documents |
| 2 | 148 x 210 (A5) | Compact size | Paper-saving, easy to carry, suitable for bulk printing | Limited space for long content | Sending notifications, invitations, short reports |
| 3 | 216 x 279 (Letter) | North American standard, compatible with many systems | Common in the US and Canada, easy to store | Not popular in Vietnam, not ISO standard | Companies exporting or working with North American partners |
| 4 | 210 x 330 (Legal) | Long size, suitable for contracts, long texts | Spacious for content, easy to fold | Difficult to print with standard printers | Legal contracts, important documents |
| 5 | 100 x 210 (DL) | Long, neat size | Compact, convenient, easy to fit into standard DL envelopes | Not suitable for printing a lot of content | Sending advertising letters, handwritten letters, small invoices |
| 6 | 297 x 420 (A3) | Large size | Suitable for detailed reports, project plans | Not convenient to carry, high printing cost | Business reports, diagrams, technical documents |
| 7 | 170 x 240 | Intermediate size between A5 and A4 | Nice size, wide enough but still compact | Not ISO standard, less popular | Sending internal letters, communication documents |
| 8 | 120 x 120 (Square) | Unique square design | Impressive, suitable for creative designs | Limited space, not suitable for long content | Thank you letters, invitations, event promotions |
| 9 | 250 x 353 (B4) | Larger than A4, suitable for documents with a lot of content | Large printing area, easy to display full content | Large size, less popular, requires large envelopes | Advertising documents, sending information for large projects |
| 10 | 90 x 210 (Slim) | Thin and long, trendy design | Unique design, paper-saving | Limited space, less popular | Sending cards, advertising letters, personal correspondence |
