Fixed Width Data Parser | Free Online Tool

What is a fixed column width text parser?

Cut fixed column width data according to field names and width specifications, and output the table to JSON or CSV. ToolHub places the core computing entirely within the browser, allowing immediate use on both desktop and mobile devices, without the need to register an account or send content to the backend.

How to use this tool?

Enter the data according to the field prompts and select the required processing method.
Click "Process Now" to view the results, indicator summary and necessary error messages.
After confirming that the content meets actual needs, you can copy the results or download them into files for further use.

Suitable use cases

Old system reports, bank batch files, host data and plain text records. All processing is completed in the current page, which is especially suitable for workflows that do not want to post internal data to remote services.

Interpretation of results and precautions

Chinese character width may be calculated in Bytes or display width in different systems. This tool uses JavaScript characters. Tools will validate basic input formats and provide readable error messages, but production environments should still be reconfirmed against source specifications, business rules, or professional requirements.

Browser and device support

Fixed Width Data Parser supports current Chrome, Edge, Firefox, and Safari releases. Mobile and desktop layouts use the same validation rules documented on this page.

Frequently Asked Questions

Will the fixed-width text parser upload data to the server?

No. Tool functions are executed directly within the current browser tab, and input and generated results will not be uploaded or saved by ToolHub.

What use cases are fixed-width text parsers suitable for?

Old system reports, bank batch files, host data and plain text records

Do I need to install software before using the fixed column width text parser?

No need. Use a desktop or mobile browser that supports modern JavaScript, and no account is required.

What are the limitations of this tool?

Chinese character width may be calculated in Bytes or display width in different systems. This tool uses JavaScript characters.

Is manual inspection required after the results are generated?

Needed. Tools can assist with calculations, conversions, or formatting, but before going online, importing data, or making business decisions, the results should still be reviewed according to actual specifications.

Fixed Width Data Parser: inputs, output, and reproducible example

Use the free Fixed Width Data Parser online. Fast, private, mobile-friendly, and processed directly in your browser.

What this page actually processes

Field	Control	Default example	Validation role
Column Specification	Text	`name:8,age:3,city:8`	Column Specification is read by the browser as a text value before the tool runs.
Output contains titlebars	Toggle	`Enabled`	Output contains titlebars is read by the browser as a toggle value before the tool runs.
Fixed Bar width information	Multiline text	`Input 3`	Fixed Bar width information is read by the browser as a multiline text value before the tool runs.

Reproduce the built-in example

Start with Column Specification = name:8,age:3,city:8; Output contains titlebars = Enabled; Fixed Bar width information = Input 3, then run Fixed Width Data Parser. Change one input at a time so the effect on the result remains traceable.

After validating column specification, output contains titlebars, fixed bar width information, the page displays its result in the output workspace and enables the relevant copy or download action.

When to use it and how to interpret the result

Limits and checks before use

Page verification record

Controls inspected3 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02