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Barcode generator

Generate an EAN, UPC, CODE128 or CODE39 barcode and download it as SVG or PNG.

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ASCII Table ReferenceFull ASCII table (0-127) with a decimal / hex / octal / binary / character converter and a text-to-codes panel.Aspect ratio calculatorFind the aspect ratio of any width and height, like 16:9.Audio file size calculatorEstimate an uncompressed audio file's size from its length, sample rate and bit depth.Bandwidth CalculatorEstimate the internet speed your household needs.Binary to text converterDecode 8-bit binary back into readable text (spaces between bytes are optional).Bitrate CalculatorCompute the bitrate of a media file from its size and duration.Citation Generator (APA / MLA / Chicago)Generate a correctly formatted reference-list entry and in-text citation (or footnote) in APA 7, MLA 9 or Chicago 17 for websites, books, journal articles and newspapers, with one-click copy.Cron expression generatorBuild a cron schedule field by field — minute, hour, day of month, month, weekday — and see the expression and a plain-language description update live. One-click presets cover the common schedules, and the syntax (*, */5, 1-5, 1,15) is explained inline.

Barcode generator works straight from this page — free, instant, nothing to install. It sits under Data & computing in our catalogue, alongside ASCII Table Reference and Aspect ratio calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Barcode generator?

Generate an EAN, UPC, CODE128 or CODE39 barcode and download it as SVG or PNG.

When would I actually use this?

Finding out how big a thing will be before you make it: how many gigabytes an hour of footage takes, how long a file needs on the connection you have, how large a photo prints before it goes soft, what bitrate fits the budget you were given.

What is the most common mistake?

Taking the advertised connection speed as the transfer speed. A 100 Mb/s line is megabits, the file is in megabytes, and the eight-fold difference between them is where most download estimates go wrong — before overhead and contention take their own share.

What else is filed next to it?

ASCII Table Reference, Aspect ratio calculator and Audio file size calculator share its section. They are not variants of it — being filed together is not the same as being alike — but that is where to look if this turned out not to be the tool you wanted.

Where do the figures come from?

Byte prefixes follow the IEC convention where a kibibyte is 1 024 bytes and a kilobyte is 1 000 — drive makers use the second, operating systems often report the first, and a disk that shrinks on arrival is that gap and nothing else. Print sizing assumes 300 dpi unless you change it.

Further reading

All guides →
ExplainerWhat Is Bitrate? Bits per Second, CBR vs VBRBitrate is how many bits of data a video or audio stream uses each second. Learn how it sets quality and file size, and the difference between constant and variable bitrate.ExplainerHow Much Data Streaming Uses: SD, HD, and 4K per HourSee how many gigabytes per hour SD, HD, and 4K video use, and how to check a monthly streaming habit against a data cap.How-toHow Much Internet Speed Do You Need? A Household GuideWork out the internet speed your home needs by adding up Mbps per video stream, video call, and gamer, with clear examples.ExplainerWhat Is Aspect Ratio? 16:9, 4:3 and How to Compute ItAspect ratio is the proportion of width to height. Learn what 16:9 and 4:3 mean, how to compute a ratio from pixel dimensions, and where each ratio is used.ExplainerWhat an Availability Percentage Actually AllowsThree nines sounds like a promise until you divide it into minutes. What 99.9 % buys per year, per month, per week and per day; why the measurement window matters far more than the extra nine; and the two different months this tool uses for the same slug.How-toHow to Write a Cron Expression: Five Fields and the OR Rule Nobody MentionsMinute, hour, day of month, month, day of week. The traps are that a step is a stride through a range and not an interval, and that the two day fields are combined with OR — so 0 0 1 * 1 fires on the 1st and on every Monday.