Delete Duplicate Lines
Keep first, last or single occurrences with matching controls.
Tools for everyday work
Clean a list, inspect data or convert a format. Choose a focused tool and keep your input on your device.
Duplicate Line Remover
Clean repeats and inspect their occurrence counts.
Remove Empty Lines
Remove blank records while retaining repeated content.
Sort Lines
Alphabetize text, reverse its order, or use natural numeric sorting.
Remove Line Breaks
Join text lines using spaces or your own separator.
Add Line Breaks
Replace a chosen separator with a new line while preserving the surrounding text.
Text Case Converter
Convert text to uppercase, lowercase, title case or sentence case on your device.
Find & Replace Text
Replace literal text once or everywhere, with optional case-insensitive matching.
Text Cleaner
Combine line deduplication, blank-line removal, trimming, space cleanup and sorting.
Remove Extra Spaces
Collapse repeated horizontal whitespace and trim each line without joining your paragraphs.
Line Counter
Count physical text lines, including blank records, using consistent newline rules.
Word Counter
Count whitespace-separated words in pasted text without sending the text to a server.
Character Counter
Count Unicode code points, including spaces and line breaks, in your text.
Text Diff Checker
Compare two versions line by line and identify added and removed content.
Text Reverser
Reverse text by visible character clusters or reverse the order of its lines.
Extract Unique Lines
Extract only lines that occur once, excluding every occurrence of repeated lines.
Extract Emails
Extract unique email-shaped addresses from text without contacting any address.
Extract URLs
Extract unique HTTP and HTTPS links from text without opening or fetching them.
Extract Numbers
Pull signed integers and decimal numbers from mixed text in their original order.
Prefix/Suffix Lines
Add literal text before and after every line while preserving line order.
CSV Viewer
Inspect quoted CSV data as a readable table.
CSV Cleaner
Clean whitespace, capitalization, empty rows and repeated rows in CSV data.
CSV Duplicate Remover
Keep the first copy of each exact CSV row while preserving headers and order.
CSV to JSON
Convert CSV records into a JSON array with named fields.
JSON to CSV
Convert an array of JSON objects to CSV with a union of object keys.
CSV to TSV
Convert comma-separated records to quoted tab-separated data.
TSV to CSV
Convert tab-separated records into correctly quoted CSV.
CSV Column Extractor
Extract one numbered column from each CSV record.
CSV Column Merger
Append a combined column made from the selected CSV fields.
CSV Column Splitter
Split a chosen CSV column using a literal separator and pad short records.
CSV Row Filter
Keep rows whose chosen column contains a literal text value.
CSV Validator
Check CSV quoting and confirm consistent column counts.
CSV Formatter
Normalize CSV quoting and record separators without changing field values.
CSV Column Reorder
Rearrange columns using an explicit sequence of column numbers.
CSV Row/Column Transposer
Swap CSV rows and columns while preserving field contents.
JSON Formatter and Beautifier
Indent valid JSON into a readable structure.
JSON Validator
Check JSON syntax locally and receive a clear validation result.
JSON Minifier
Remove formatting whitespace from valid JSON without changing its values.
Base64 Encoder
Encode UTF-8 text as Base64 in your browser.
Base64 Decoder
Decode Base64-encoded UTF-8 text with validation.
URL Encoder
Percent-encode a text value for use as one URL component.
URL Decoder
Decode percent escapes in a URL component without opening a URL.
HTML Encoder
Escape HTML-sensitive characters so text can be represented as data.
HTML Decoder
Decode numeric HTML references and common named entities into plain text.
JWT Decoder
Inspect a JWT header and payload locally without verifying its signature.
UUID Generator
Generate random UUID version 4 identifiers using browser cryptography.
Random String Generator
Generate random alphanumeric strings using browser cryptography.
Regex Tester
Test a JavaScript regular expression and inspect matching text and positions.
Timestamp Converter
Convert an ISO date with timezone into Unix seconds and milliseconds.
Unix Timestamp Converter
Convert Unix seconds or milliseconds into an ISO UTC date.
URL Parser
Inspect the components and query entries of an HTTP or HTTPS URL locally.
HTTP Status Code Reference
Look up standard HTTP response status names and categories without requesting a website.
HTML to Markdown
Convert pasted HTML structure into readable Markdown without executing the HTML.
TXT to DOCX
Convert a UTF-8 text file into a Word document with one paragraph per line.
Merge TXT Files
Combine text files in the displayed order with a newline between files.
Split TXT File
Split a text file into downloadable parts containing a chosen number of lines.
Compare Two Files
Compare two UTF-8 text files and download a unified line diff.
Extract Text from TXT
Read a UTF-8 TXT file locally so its contents can be copied or downloaded.
Image Compressor
Re-encode a still image as JPEG with adjustable quality and an output-size comparison.
Image Resizer
Resize a still image to explicit pixel dimensions using local canvas processing.
JPG to PNG
Convert a JPEG image into a PNG file entirely on your device.
PNG to JPG
Convert a PNG image into JPEG with a white background for transparent pixels.
WebP Converter
Convert a still PNG, JPEG or WebP image into WebP when your browser supports it.
Image Cropper
Crop a rectangular region using pixel coordinates within the original image.
Image Metadata Viewer
Inspect the format, file size and pixel dimensions of a local image.
Heading Structure Checker
Inspect heading order, empty headings and skipped levels in pasted HTML.
Color Converter
Convert opaque HEX, RGB and HSL color values with explicit range validation.
Markdown to HTML
Convert Markdown into HTML source displayed safely as plain text.
Slug Generator
Create a readable Unicode URL slug from a title by removing punctuation and joining words.
UTM Builder
Build a campaign URL with encoded source, medium and campaign parameters.
XML Sitemap Generator
Create a URL sitemap from canonical page URLs, with XML escaping and duplicate removal.
Robots.txt Generator
Generate crawler directives from disallowed paths and an optional sitemap URL.
FAQ Schema Markup Generator
Generate FAQPage JSON-LD from question and answer pairs separated by tabs.
Keyword Grouping Tool
Organize keyword phrases into groups sharing the same first word.
Keyword Clustering Tool
Group related phrases using shared-word similarity with an adjustable threshold.
Content Word Count Checker
Measure whitespace-separated words, Unicode code points and paragraphs together.
Content Outline Generator
Create a practical editorial outline template around one topic for your own research.
Meta Title Preview
Inspect a title in a simple search-style preview and measure its character count.
Meta Description Preview
Inspect a description in a simple snippet preview and measure its character count.
Google SERP Snippet Preview
Combine a title, URL and description into an illustrative search snippet.
Open Graph Preview
Preview a text-only social card using your title, URL and description.
TXT to PDF
Prepare a UTF-8 text file for a paginated PDF using your browser’s Print / Save as PDF dialog.