What padding characters are supported?

Any single character — space, zero, dash, dot, or anything you type. The character is repeated to reach the target width.

What happens if a line is already wider than the target?

Lines longer than the target width are left unchanged. Padding never truncates content.

Is the padding measured in characters or code points?

By Unicode code points, matching String.padStart/padEnd. Fullwidth characters may appear wider than their padded length in monospace fonts.

No. Padding is computed locally in your browser.

padStart · padEnd · custom char

Pad lines to a fixed width

Pad each line left or right with any character. Perfect for zero-padded IDs and fixed-width columns.

Pad Text Workspace

Lines

15 B

Width

padStart

Pad char

"0"

single char

Output

35 B

padded

input · lines

output · padded

Quick Start

How to pad text

Pads each line to a fixed width using String.padStart() (pad left) or padEnd() (pad right). Common for zero-padded numeric IDs.

01
Paste lines
One value per line.
Tokenisation is Unicode-aware via \p{L}\p{N} property classes — so accented letters, ideographs, and emoji code points all count correctly.
linesUTF-8Unicodecode pointslive
input · textraw · UTF-8
```
5
42
```
loaded · UTF-8UTF-8 · ready
02
Pick side
Pad left = padStart (typical for numbers). Pad right = padEnd (typical for table columns).
Live re-counts run on every keystroke through a memoised reducer, so even multi-megabyte inputs stay smooth in the editor.
padStartpadEndlivememoisedoptions
side · optionsleft · live
```
00000005
00000042
```
options applied · livelive
03
Set width & char
Width is the target total length. Pad char defaults to 0 — try space, dot, or any single char.
Output preserves the original line endings (\n vs \r\n) and trailing whitespace is reported separately so you can spot diff-only changes.
widthcharline endingswhitespacediff-clean
config · counted8 · 0 · ready
```
00000123
```
counted · livecounted
04
Copy or download
One click.
Copy writes via the Async Clipboard API; downloads ship as text/plain; charset=utf-8 — nothing leaves your tab.
copyclipboardtext/plainblobclient-side
export · copiedready · done
```
✓ Copied
```
shipped · ready to shipsuccess

Pro tips

Text-processing fundamentals worth knowing

Tokenise with Unicode classes

Use \p{L}\p{N} with the u flag so accents, ideographs, and emoji count properly.

Normalise line endings

Convert \r\n to \n before diffing or hashing — Windows-vs-Unix endings produce phantom changes.

Mind invisible characters

Zero-width joiners, BOMs, and non-breaking spaces look identical to ASCII space. Strip them before comparison or storage.

Stream don’t slurp

For multi-megabyte text, iterate line-by-line rather than loading everything to memory — keeps the tab responsive.

Choose collation deliberately

Default JS sort is code-point order, not human alphabetical. Use Intl.Collator for locale-aware sorting.

Re-run after normalisation

NFC vs NFD changes byte length but not visible glyphs. String.prototype.normalize() before counts and comparisons.

Use Cases

When to pad text

Anywhere fixed-width formatting matters.

Zero-padded IDs

5 → 00005 for filesystem ordering or DB indexes.

Unicode-correct

Fixed-width columns

Old systems that parse columns by character offset. Result updates as you type — paste and watch totals settle in milliseconds even on multi-megabyte inputs. Heavy work runs through a memoised reducer so the editor never janks.

diff-clean

Receipt formatting

Right-align dollar amounts. Output normalises line endings to LF for clean diffs across platforms. Windows-vs-Unix CRLF mismatches disappear, which keeps git blame honest and review comments focused on real changes.

instant counts

Order numbers

ORDER-000123 style sequential IDs. Code-point counts are stable across NFC/NFD normalisation. Pair with the Reading Time Calculator to layer scan-time on top of raw counts, useful for editorial budgets and SEO meta-description limits.

platform-aware

ASCII tables

Pad right with spaces for clean ASCII tables. All processing runs client-side — paste sensitive or pre-publish copy without it leaving the tab. The clipboard API writes UTF-8 text/plain so it survives transit to any editor or CMS.

code-point-accurate

Hex padding

0x0001 instead of 0x1 for memory addresses. Same input plus same options always produces identical output, so the tool is safe to embed in CI scripts or doc-generation pipelines without race conditions.

lossless

FAQ

Frequently asked questions

What if a line is already wider than the target?

It's left as-is — never truncated. Use Truncate Text for that.

Can I use a multi-char pad?

Only single chars in the UI. Use Add Prefix/Suffix for multi-char wraps.

Does it count Unicode correctly?

Uses String.length (UTF-16 code units), not graphemes. Emoji may not align visually.

Pad left vs right?

Left = padStart (zeros before number). Right = padEnd (spaces after text).

Is anything sent to a server?

No. All processing runs locally.

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