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What is the bar code

Barcode is a graphical presentation of information. The information is encoded with dark and light stripes, determined by symbolism-specific code. Barcode is designed for e-readers, additionally usually under the code there is placed the text representation of what was contained in the code. It is designed to allow manual entry of code where the reader will not be able to read the information.

The use of codes

Barcode found the widest application in trade. The main use of the bar code is the automatic identification of products, which allows much faster, for example customer service at cash registers. Nowadays it is practically impossible to find in store merchandise that hasn't got a bar code assigned. If the shop gets merchandise that does not have an official barcode, the shop assigns custom barcode to it. Even companies associated with the transport couldn't resist the popularity of barcode: every parcel, pallet is labeled with a barcode.

Barcode reproduction

A key element that determines whether barcode fulfills its primary task is print quality. The print quality is dependent on the nature of the ground and from techniques of reproduction. Main reproduction problems: spreading of the paint, poor fixation of paint, too low contrast between the color of the substrate and the color bars.

Bar width reduction

One of the most common problems during reproduction is an increase in the thickness of the bar. Each of the generators have the capability to reduce the width of the line. This allows the generation of such a code, which after being printed will have the correct width of the bar. That increases your chances of reading the code by the reader. For barcodes EAN-8 and EAN-13 nominal bar width is 0.33 mm. Using the bar width reduction must not lead to a situation where the thinnest bar will be less than 0.13 mm in the printing form. If this happens, use a higher zoom ratio to (0.33 mm × magnification factor) - REDUCE WIDTH ≥ 0.13 mm.
  • no bar width reduction (BWR = 0)

    Kod kreskowy wygenerowany bez redukcji grubości kreski

    Generated

    Kod kreskowy wygenerowany bez redukcji grubości kreski po reprodukcji

    After reproduction

  • with bar width reduction (BWR > 0)

    Kod kreskowy wygenerowany z redukcją grubości kreski

    Generated

    Kod kreskowy wygenerowany z redukcją grubości kreski po reprodukcji

    After reproduction

Scale

For barcodes EAN-8 and EAN-13 it is recommended to use Coefficient of magnification in the range of 80% to 200% of the nominal size. Each of the generators allows you to enter the zoom ratio in this range. Recommended zoom factors:
Process and material Minimum scale
Offset printing 80%
Flexographic printing on paper and foil 130%
Flexographic printing on corrugated board 160%
Screen printing 120%

Wide to Narrow bar ratio („wide element” to „narrow element” ratio)

The wide-to-narrow ratio of a barcode is the relationship of narrow elements to wide elements. Example: ratio 3, set width of „wide element” to 3-times larger than the „narrow element”.
  • Barcode created with ratio 2.5

    Barcode created with ratio 2.5

    „narrow element” - width 2px

    „wide element” - width 5px

  • Barcode created with ratio 4.0

    Barcode created with ratio 4.0

    „narrow element” - width 2px

    „wide element” - width 8px

The contrast between the base color and the color of bars

The most frequently used bar code readers are equipped with red light - 630 nm wave length. Symbols are correctly read only if the prints with the printed code, lines dimensions, have got right overprint contrast. Obtaining the contrast is dependent on both the background color and the color bars. The background should as bright as possible and the lines should be at their darkest. Background color should be: white, yellow, orange or bright red, and lines: black, blue, green and dark brown.

The accuracy of output devices

When reproducing the barcode accuracy of output devices must be considered. Inkjet printer running at a resolution of 600 dpi is accurate to 0.0423 mm. So if we print on the 0.33 mm bar we may receive a dash with a thickness from 0.29 mm to 0.37 mm. An imagesetter, which is used to perform printing forms works usually with a resolution of 2540 dpi, gives the accuracy of 0.01 mm. In this case, the bar width is between 0.32 mm and 0.34 mm.
EAN-8 barcode
  • Barcode EAN-8, encode digits 1234567, checksum 0
  • Barcode EAN-8, encode digits 2345678, checksum 5
  • Barcode EAN-8, encode digits 3456789, checksum 0
  • Barcode EAN-8, encode digits 4567890, checksum 5
  • Barcode EAN-8, encode digits 5678901, checksum 0
EAN-13 barcode
  • Barcode EAN-13, encode digits 123456789012, checksum 8
  • Barcode EAN-13, encode digits 123456789012, checksum 8 with 2 additional digits
  • Barcode EAN-13, encode digits 123456789012, checksum 8 with 5 additional digits
EAN-128 barcode
  • Barcode EAN-128, encode production date 13-11-27
  • Barcode EAN-128, encode expiry date and time 13-11-27 13:26
  • Barcode EAN-128, encode production date and time 13-11-27 13:45:15
UPC-A barcode
  • Barcode UPC-A, encode digits 98765432109, checksum 8
  • Barcode UPC-A, encode digits 05413269145, checksum 2
  • Barcode UPC-A, encode digits 20140111102, checksum 3
UPC-E barcode
  • Barcode UPC-E, encode digits 071245, checksum 3
  • Barcode UPC-E, encode digits 425261, checksum 4
  • Barcode UPC-E, encode digits 419253, checksum 7
  • Barcode UPC-E, encode digits 974310, checksum 2
Code-128 barcode
  • Barcode Code-128, encode digits 123456789012345678901234567890
  • Barcode Code-128, encode text Ala ma kotka
  • Barcode Code-128, encode text ABCDE12345abcde
Identcode barcode
  • Barcode Identcode, encode digits 12345678901, checksum 6
  • Barcode Identcode, encode digits 98765432109, checksum 4
  • Barcode Identcode, encode digits 20140110204, checksum 5
Leitcode barcode
  • Barcode Leitcode, encode digits 1234567890123, checksum 6
  • Barcode Leitcode, encode digits 9876543210921, checksum 2
  • Barcode Leitcode, encode digits 2014011020480, checksum 3
ITF-14 barcode
  • Barcode ITF-14, encode digits 1234567890123, checksum 1
  • Barcode ITF-14, encode digits 9876543210921, checksum 3
  • Barcode ITF-14, encode digits 2014011020480, checksum 7
Interleaved 2 of 5 barcode
  • Barcode Interleaved 2 of 5, encode digits 1234567890123456789000
  • Barcode Interleaved 2 of 5, encode digits 2345678901234567890110
  • Barcode Interleaved 2 of 5, encode digits 3456789012345678901220
Standard 2 of 5 barcode
  • Barcode Standard 2 of 5, encode digits 123456789, checksum 5
  • Barcode Standard 2 of 5, encode digits 234567890, checksum 6
  • Barcode Standard 2 of 5, encode digits 345678901, checksum 7
Matrix 2 of 5 barcode
  • Barcode Matrix 2 of 5, encode digits 123456789012345678900
  • Barcode Matrix 2 of 5, encode digits 234567890123456789010
  • Barcode Matrix 2 of 5, encode digits 345678901234567890120
Code-39 barcode
  • Barcode Code-39, encode characters ABCDEFGHIJKLMNOPQRSTUX
  • Barcode Code-39, encode characters VWXYZ-. $/+%1234567890A
Code-93 barcode
  • Barcode Code-93, encode characters ABCDEFGHIJKLMNOPQRSTU
  • Barcode Code-93, encode characters VWXYZ-. $/+%1234567890
Code-11 barcode
  • Barcode Code-11, encode characters 12345-6789010-
  • Barcode Code-11, encode characters 23456-78901282
  • Barcode Code-11, encode characters 34567-89012367
  • Barcode Code-11, encode characters 45678-90123453
Codabar barcode
  • Barcode Codabar, encode characters 1234567890
  • Barcode Codabar, encode characters 3117013206375
Codabar Rationalized barcode
  • Barcode Codabar, encode characters 1234567890
  • Barcode Codabar, encode characters 3117013206375
MSI Plessey barcode
  • Barcode MSI Plessey, encode digits 1234567, checksum 4
  • Barcode MSI Plessey, encode digits 8052, checksum 3
Pharmacode One Track barcode
  • Barcode Pharmacode One Track, encode number 12345
  • Barcode Pharmacode One Track, encode number 56789
Pharmacode Two Track barcode
  • Barcode Pharmacode Two Track, encode number 12345
  • Barcode Pharmacode Two Track, encode number 56789
Postnet barcode
  • Barcode Postnet, encode characters 0123456789,checksum 5
  • Barcode Postnet, encode characters 9876543210,checksum 5
Planet barcode
  • Barcode Planet, encode characters 01234567890,checksum 5
  • Barcode Planet, encode characters 98765432109,checksum 6
Royalmail (RM4SCC) barcode
  • Barcode Royalmail (RM4SCC), encode characters 0123456789,checksum 6
  • Barcode Royalmail (RM4SCC), encode characters ABCDEFGHIJ,checksum Y
Aztec code
  • Aztec code, encode link to page http://www.free-barcode-generator.net/aztec/
  • Aztec code, encode bookmark to web page http://www.free-barcode-generator.net/aztec/
  • Aztec code, encode SMS message
  • Aztec code, encode e-mail message
DataMatrix code
  • DataMatrix code, encode link to page http://www.free-barcode-generator.net/
  • DataMatrix code, encode bookmark to web page http://www.free-barcode-generator.net/datamatrix/
  • DataMatrix code, encode SMS message
  • DataMatrix code, encode e-mail message
QR code
  • QR code, encode link to page http://www.free-barcode-generator.net/
  • QR code, encode bookmark to web page http://www.free-barcode-generator.net/qrcode/
  • QR code, encode SMS message
  • QR code, encode e-mail message
 
Barcodes generated on this page have been printed and scanned with a barcode reader AS-8000 (except Pharmacode, Postnet, Planet, Royalmail), QR, DataMatrix and Aztec codes will be scanned with ZXing Decoder Online. Some readers require proper configuration so that they can read correctly some of the codes: part of the code is normally disabled, some codes have checksum, but do not need to have one, etc. The creators of the site have made every effort to ensure the high quality of the generated barcodes. Barcodes generated by the service are provided on a rule "as it is" without warranty of any kind, when it comes to the quality and suitability for use. This website is not liable for any damage resulting the use of barcodes that are generated by this website. Use of this website means unconditional acceptance of the above information.
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