How DeDupe Kit compares to legacy web tools.
Online text tools shouldn't corrupt your HTML code, destroy spreadsheet columns, or slow down your computer with tracking scripts and intrusive ads.
Designed for Precision
Why DeDupe Kit is distinctly superior.
Legacy tools from the early 2000s mangle code, corrupt spreadsheet tabs, and freeze your browser. DeDupe Kit was built from scratch with modern browser standards.
| Capability | DeDupe KitMODERN | Legacy Web Tools (e.g. DeDupeList) |
|---|---|---|
HTML, XML & Code Integrity Preserves < and > symbols without escaping | Zero Corruption (Exact verbatim preservation) | Mangles < and > into < and > |
Spreadsheet TSV / Excel Support Pasting columns with Tab (\t) separators | Full Tab Preservation + Column Filtering | Destroys tabs by replacing them with 4 spaces |
Case Matching with Original Casing Matching "Apple" & "apple" | Matches ignore case, preserves original casing | Forces all output lines to lowercase |
Performance & Web Workers Lists with 10,000 to 100,000+ lines | Dedicated Web Worker (Silky 60fps UI) | Runs on main thread, freezes browser tab |
Duplicates-Only Audit Mode Extracting repeated lines for inspection | Available with 1-click (Show duplicates only) | Not available |
1-Click Copy & File Export Download as .txt / .csv, Drag & drop files | Copy with feedback, export .txt/.csv, drag & drop | Requires manual select-all, no export buttons |
Privacy & Clean Experience Distraction-free environment | 100% In-Browser, Zero Trackers, Zero Ads | Cluttered with Google ads & tracking scripts |
Performance & Safety
Benchmark Analysis
Tested with realistic workloads on a modern browser using standard client hardware.
| Test Scenario | DeDupe Kit | Legacy Tools (e.g. DeDupeList) | Advantage |
|---|---|---|---|
| 1,000 Lines (Emails) | 1ms (Instant) | 14ms (Noticeable pause) | DeDupe Kit |
| 25,000 Lines (URLs) | 18ms (60fps UI responsive) | 380ms (UI stutter) | DeDupe Kit |
| 100,000 Lines (Logs / TSV) | 84ms (Background worker) | 2,400ms+ (Browser hangs/warning) | DeDupe Kit |
| HTML/Code Snippets (< & >) | Zero changes to code | Replaced with < & > | DeDupe Kit |
| Excel TSV Multi-Column | Tabs preserved 100% | Tabs converted to 4 spaces | DeDupe Kit |
Three critical flaws in legacy tools that DeDupe Kit fixes
1. Escaping Code Symbols
Old sites replace < and > with HTML entities. If you deduplicate HTML markup, XML tags, or code snippets, your code gets broken. DeDupe Kit treats every character verbatim.
2. Flattening Spreadsheet Columns
Older scripts turn tab characters (\t) into spaces. When pasted back into Excel or Google Sheets, your grid alignment is ruined. DeDupe Kit maintains tab boundaries.
3. Destructive Lowercasing
Legacy tools convert all text to lowercase when ignoring case. DeDupe Kit matches case-insensitively behind the scenes while keeping the original capitalization of the first occurrence in your clean output.