Inspect the bidirectional control characters in your text, the embeddings, overrides, and isolates, and check that every one is properly closed.
Quick Answer
The Urdu Bidi Control Character Inspector lists the bidirectional format controls in your text, the embeddings, overrides, and isolates, and checks that each opening character has a matching closing one. An unbalanced control can leak its direction into the rest of the text, and this tool finds it. Everything runs in your browser.
Inspect Bidi Control Characters
Paste text to inspect its bidi control characters and check they are balanced.
Inspection
- Controls
- 0
- Embeddings/overrides
- 0
- Isolates
- 0
- Unbalanced
- 0
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Tap a star to rate the Urdu Bidi Control Character Inspector.
What the Urdu Bidi Control Character Inspector Does
The Urdu Bidi Control Character Inspector focuses on the bidirectional format controls, the embeddings, overrides, and isolates that open and close a direction context. It lists each one and checks that every opening control has a matching closing control.
Where a general bidi inspector lists all bidi characters, this one is about the controls that come in pairs, and whether those pairs are balanced.
Everything runs on your own device. Your text is never uploaded or stored, so it stays private while you inspect it.
How to Inspect Controls
- Paste your text. Enter or paste the text you want to inspect.
- Read the list. See each control character with its name and index.
- Check the balance. See whether every opening control is properly closed.
- Copy or download. Copy the report, or save it as a text file.
The Control Characters
The controls are the left-to-right and right-to-left embeddings, the two overrides, the pop formatting character that closes them, the left-to-right, right-to-left, and first-strong isolates, and the pop isolate that closes them. The plain directional marks are not controls, since they do not open a context.
Opening and Closing
Each embedding or override must be closed with a pop formatting character, and each isolate must be closed with a pop isolate. The inspector tracks the opening controls on a stack and matches each pop to the most recent opening, then reports any that are left open or any pop that has nothing to close.
When a Control Leaks
If an opening control is never closed, its direction can leak into the text that follows, which changes how everything after it is laid out. An extra pop with nothing to close is usually harmless but signals that the markup is wrong. Either way, balancing the controls fixes the layout.
A Worked Example
Text:
Loading example…
Inspection:
Loading example…
The live inspector is preparing this example…
The result above comes from the same function the tool uses, so it reflects real behavior. Press Load Example to try it.
Who Uses This Inspector
Developers use it to debug direction markup in strings. Localization engineers use it to check messages. Anyone whose layout leaks direction uses it to find the unclosed control.
Accuracy and Limits
The inspector identifies the control characters by their code points and matches openings to closings with a stack, the same way the Bidirectional Algorithm nests them. It checks pairing; it does not compute the final visual order of the text.
Good to know: to see the effect of the controls, use the bidirectional text tester with its preview.
Your Data Stays Private
The inspector runs fully in your browser with standard web technology. Your text is not uploaded or stored, and it is not sent to any analytics service. Only your star rating is sent, to record the tool’s rating. When you close the page, your text is gone.
Frequently Asked Questions
What does the Urdu Bidi Control Character Inspector do?
It lists the bidirectional control characters in your text and checks that every opening embedding, override, or isolate is properly closed.
Which characters count as controls?
The embeddings, the two overrides, the pop formatting character, the three isolates, and the pop isolate. The plain marks are not controls.
What does unbalanced mean?
An opening control with no matching close, or a pop with nothing to close. Unbalanced controls can change the layout of the text after them.
How does it match pairs?
It puts each opening control on a stack and matches a pop to the most recent opening, the way the Bidirectional Algorithm nests them.
Does it show the final order?
No. It checks the controls. To see the resulting order, use the bidirectional text tester.
Is my data safe?
Yes. Everything runs in your browser. Your text is never uploaded, saved, or shared.
Is this tool free?
Yes, it is completely free and needs no account to use.
Does it work on mobile?
Yes. It works on phones, tablets, and computers.
Explore More Free Urdu Unicode and RTL Tools
Inspectors, detectors, cleaners, and normalizers built for real Urdu Unicode text.
Open the Urdu Tools hubSources and standards
- The Unicode Standard and code charts (Arabic block U+0600, Arabic Supplement, Presentation Forms). unicode.org/charts
- UAX #9, Unicode Bidirectional Algorithm (RTL, marks, isolates, overrides). unicode.org/reports/tr9
- UAX #15, Unicode Normalization Forms (NFC, NFD, NFKC, NFKD). unicode.org/reports/tr15
- MDN Web Docs, String.prototype.normalize and code point methods. developer.mozilla.org
This free tool lists the bidirectional control characters in your text and checks that every opening embedding, override, or isolate has a matching close. It checks pairing with a stack and does not compute the final visual order. Your star rating is stored on the site.