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Dart Online Compiler

Write Dart, press Run, and see the output — stdin input included.

  • Free
  • No signup
  • Nothing uploaded
  • No watermark

Source

9 lines
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Program output

269 B
Ctrl+Enter · Dart · runs on a shared compile server — not in your browser, so keep secrets out
Input for the program (optional)

Press Run to execute the program. Output appears here.

Read in this tab. Nothing you paste or open is ever uploaded.

How to Use the Dart Online Compiler Online

Dart Online Compiler: before and after DART A BEFORE DART ONLINECOMPILER DART A AFTER

Runs Dart and shows the output — real compiler messages with line numbers, real program output, and input through stdin.readLineSync() — which is what people looking for an online Dart compiler actually want from the page. Because no Dart toolchain can run inside a browser, this is the one kind of tool on ToolXkit that does not stay on your device: the code and its input go to a shared public compile server for the run, are not stored by this site, and come back as output. That is stated next to the Run button rather than hidden, so nobody pastes something private without knowing. Type any input the program reads into the Input box first, press Run, and read the result beside the code; errors name the line so the fix is quick. Runs are limited per visitor to keep the shared server fair.

No software to install Free Works on any device

Step-by-Step Guide to Using the Dart Online Compiler

  1. 1. Write or paste your program on the left — a working example is loaded to start from

  2. 2. Press Run (or Ctrl+Enter)

    This language has no browser compiler, so the code goes to a shared compile server — put any input the program reads in the Input box first.

  3. 3. Output appears beside the code

    errors name the line. Fix, run again, and Download the file when it is right.

Try it now

What is the Dart Online Compiler?

Runs Dart and shows the output — real compiler messages with line numbers, real program output, and input through stdin.readLineSync() — which is what people looking for an online Dart compiler actually want from the page. Because no Dart toolchain can run inside a browser, this is the one kind of tool on ToolXkit that does not stay on your device: the code and its input go to a shared public compile server for the run, are not stored by this site, and come back as output. That is stated next to the Run button rather than hidden, so nobody pastes something private without knowing. Type any input the program reads into the Input box first, press Run, and read the result beside the code; errors name the line so the fix is quick. Runs are limited per visitor to keep the shared server fair.

DART file

.DART

Write Dart, press Run, and see the output — stdin input included.

Why Use an Online File Viewer?

Not every computer has the right program for a YAML, VCF, SRT or log file, and installing one just to look inside is a chore. A viewer opens the file in your browser and shows it neatly next to its source text.

“Sometimes you just need to see what is inside the file.”
  • No software to install
  • Data laid out as tables
  • Subtitles shown with timings
  • Code tried out in the page
  • Colour-coded source text
  • Contacts and calendars readable
  • Works on shared computers
  • Private files stay local

Popular Uses for Code and Data Viewers

People open these when a file arrives and nothing on the computer will show it.

  • Checking a JSON response Open a JSON or YAML file as a readable tree instead of one long line.
  • Reading contact backups See the names and numbers inside a VCF file exported from a phone.
  • Opening calendar invites Read the date, time and place in an ICS file before adding it.
  • Checking subtitles View SRT or VTT subtitles with their timings to spot a missing line.
  • Reading log files Scroll through a server or app log with the lines laid out clearly.
  • Previewing CSV and TSV Look at a data file as a table without opening a spreadsheet program.
  • Trying a code snippet Run a short Python or JavaScript example from a tutorial and see the output.
  • Viewing SVG graphics See how an SVG icon or drawing looks next to the markup behind it.

What You Can Do with the Dart Online Compiler

Highlighting follows the language’s real grammar rather than a list of keywords

Reads a file you have not yet decided to trust, without registering a handler for it

Why Use ToolXkit for Dart Online Compiler?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

File Viewers for Different Users

Developers

Inspect config, env and data files on any machine without an editor installed.

Programming students

Try small programs in Python, JavaScript or SQL without setting anything up.

IT support staff

Open logs, HAR files and settings files that users send in.

Office workers

Read contact, calendar and CSV files that arrive as email attachments.

Video editors

Check subtitle files for timing and text before a video goes out.

Data analysts

Glance at CSV, TSV, JSONL and GeoJSON files before loading them anywhere.

Best Times to View a File Online

A browser viewer is handy when you are:

  • Using a borrowed or office computer
  • Opening an unfamiliar attachment
  • Checking a file before importing it
  • Learning to code without installing
  • Debugging a settings file
  • Proofreading subtitle timings
  • Looking inside a phone backup
  • Reviewing a server log

Frequently Asked Questions

Answers to common questions about this tool.

Where does the code run?

On a shared public compile server, not in your browser — there is no Dart compiler that runs inside a tab, so this is the only honest way to give you real output. The code and any input you type are sent to that server for the run and are not stored by ToolXkit. Do not paste secrets, keys or private data.

How do I give the program input?

Open the "Input for the program" box under the toolbar and type the lines before pressing Run — one line per read. The program reads them through stdin.readLineSync() exactly as it would from a terminal; when they run out it sees end-of-input.

What are the limits?

Twelve runs a minute per visitor, a few seconds of CPU time, and no network or file access on the server side. Long-running or network-bound programs will be stopped with a message.

Is this different from the Python and C++ pages?

Yes — Python, C and C++, JavaScript, PHP and SQL compile and run inside your browser, so nothing leaves it. Dart needs a real toolchain that no browser can host, which is why this page is the exception and says so.

Does Dart Online Compiler upload my file?

No. The file is read by your browser and shown on screen without being sent anywhere. Config files with passwords, contact lists and logs remain on your own computer.

Do the online compilers run real code?

Some languages, such as Python, JavaScript, TypeScript, Lua and SQL, run inside your browser. For others, the page is mainly for reading and sharing the code, so read the note on that page to know what to expect.

Does Dart Online Compiler cost anything or need a login?

Neither. There is no fee, no sign-up and no cap on how many files you open. It works the same on a work laptop, a home computer or a phone.

What if my file is very large?

Large logs and data files depend on your device’s memory, because the whole file is read in the browser. If a huge file feels slow, try a computer with more memory or view a smaller part of it.

Can I open a file from my phone?

Yes. Use the file picker to choose it from your phone’s storage or a downloaded attachment, and the contents appear on the page. A larger screen is easier for long files, but everything works on mobile.

Further reading

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